Scrollview with big custom view and smaller textviews

Scrollview with big custom view and smaller textviews - android

I am trying to make a scrollable layout, where I would have a single bigger custom view at the start and dynamic amount of smaller TextViews after it.
Like this:
|-----|---Start of devices screen
| |
| | -Custom view 1
| |
|-----|
| |---TextView & End of devices screen
|-----|
|-----|
| |
|-----|
The custom view is a view where I do some drawing in onDraw().
I have been trying to fiddle with the onMeasure() method, layout_height and layout_weight properties, but I am unable to get a satisfactory result. I always end up with a unscrollable layout or one without the custom view. Only way I have been able to get the functionality is by setting the custom view's height to some 'dp' value, but I would like it leave the same physical amount of space in the botto of the screen.
Is something like this possible with the tools Android provides, or would this need some custom view for the scrolling too? How would I go about implementing this?
Edit: To clarify, I need the first element I have in the ScrollView to initially either fill the whole visible area of the ScrollView or leave a small space under it that is constant on every device.

Use Flow Layout In place of your custom layout
find flow layout implementation link
https://docs.google.com/file/d/0B_VKZCqEnHblNDdiY2UxODgtYWNhNS00MmU4LWE4NDMtZjQ1OWI5MDMxZTVh/edit?num=50&sort=name&layout=list&pli=1#
package com.example.android.layout;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
public class FlowLayout extends ViewGroup {
private int mHorizontalSpacing;
private int mVerticalSpacing;
private Paint mPaint;
public FlowLayout(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FlowLayout);
try {
mHorizontalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_horizontalSpacing, 0);
mVerticalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_verticalSpacing, 0);
} finally {
a.recycle();
}
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setColor(0xffff0000);
mPaint.setStrokeWidth(2.0f);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSize = MeasureSpec.getSize(widthMeasureSpec) - getPaddingRight();
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
boolean growHeight = widthMode != MeasureSpec.UNSPECIFIED;
int width = 0;
int height = getPaddingTop();
int currentWidth = getPaddingLeft();
int currentHeight = 0;
boolean breakLine = false;
boolean newLine = false;
int spacing = 0;
final int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
measureChild(child, widthMeasureSpec, heightMeasureSpec);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
spacing = mHorizontalSpacing;
if (lp.horizontalSpacing >= 0) {
spacing = lp.horizontalSpacing;
}
if (growHeight && (breakLine || currentWidth + child.getMeasuredWidth() > widthSize)) {
height += currentHeight + mVerticalSpacing;
currentHeight = 0;
width = Math.max(width, currentWidth - spacing);
currentWidth = getPaddingLeft();
newLine = true;
} else {
newLine = false;
}
lp.x = currentWidth;
lp.y = height;
currentWidth += child.getMeasuredWidth() + spacing;
currentHeight = Math.max(currentHeight, child.getMeasuredHeight());
breakLine = lp.breakLine;
}
if (!newLine) {
height += currentHeight;
width = Math.max(width, currentWidth - spacing);
}
width += getPaddingRight();
height += getPaddingBottom();
setMeasuredDimension(resolveSize(width, widthMeasureSpec),
resolveSize(height, heightMeasureSpec));
}
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
child.layout(lp.x, lp.y, lp.x + child.getMeasuredWidth(), lp.y + child.getMeasuredHeight());
}
}
#Override
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
boolean more = super.drawChild(canvas, child, drawingTime);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (lp.horizontalSpacing > 0) {
float x = child.getRight();
float y = child.getTop() + child.getHeight() / 2.0f;
canvas.drawLine(x, y - 4.0f, x, y + 4.0f, mPaint);
canvas.drawLine(x, y, x + lp.horizontalSpacing, y, mPaint);
canvas.drawLine(x + lp.horizontalSpacing, y - 4.0f, x + lp.horizontalSpacing, y + 4.0f, mPaint);
}
if (lp.breakLine) {
float x = child.getRight();
float y = child.getTop() + child.getHeight() / 2.0f;
canvas.drawLine(x, y, x, y + 6.0f, mPaint);
canvas.drawLine(x, y + 6.0f, x + 6.0f, y + 6.0f, mPaint);
}
return more;
}
#Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof LayoutParams;
}
#Override
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
#Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(getContext(), attrs);
}
#Override
protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new LayoutParams(p.width, p.height);
}
public static class LayoutParams extends ViewGroup.LayoutParams {
int x;
int y;
public int horizontalSpacing;
public boolean breakLine;
public LayoutParams(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FlowLayout_LayoutParams);
try {
horizontalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_LayoutParams_layout_horizontalSpacing, -1);
breakLine = a.getBoolean(R.styleable.FlowLayout_LayoutParams_layout_breakLine, false);
} finally {
a.recycle();
}
}
public LayoutParams(int w, int h) {
super(w, h);
}
}
}
<resources>
<declare-styleable name="FlowLayout">
<attr name="horizontalSpacing" format="dimension" />
<attr name="verticalSpacing" format="dimension" />
</declare-styleable>
<declare-styleable name="FlowLayout_LayoutParams">
<attr name="layout_breakLine" format="boolean" />
<attr name="layout_horizontalSpacing" format="dimension" />
</declare-styleable>
</resources>

Related

Overlay TextureView with circle border View

Android newbie here but I'm trying to overlay a transparent circle view over a TextureView stream from the device camera, however no matter what I do I cannot get the overlay view to appear on top of the TextureView. I have the TextureView implemented as such:
package org.tensorflow.demo;
import android.content.Context;
import android.util.AttributeSet;
import android.view.TextureView;
/**
* A {#link TextureView} that can be adjusted to a specified aspect ratio.
*/
public class AutoFitTextureView extends TextureView {
private int ratioWidth = 0;
private int ratioHeight = 0;
public AutoFitTextureView(final Context context) {
this(context, null);
}
public AutoFitTextureView(final Context context, final AttributeSet attrs) {
this(context, attrs, 0);
}
public AutoFitTextureView(final Context context, final AttributeSet attrs, final int defStyle) {
super(context, attrs, defStyle);
}
/**
* Sets the aspect ratio for this view. The size of the view will be measured based on the ratio
* calculated from the parameters. Note that the actual sizes of parameters don't matter, that
* is, calling setAspectRatio(2, 3) and setAspectRatio(4, 6) make the same result.
*
* #param width Relative horizontal size
* #param height Relative vertical size
*/
public void setAspectRatio(final int width, final int height) {
if (width < 0 || height < 0) {
throw new IllegalArgumentException("Size cannot be negative.");
}
ratioWidth = width;
ratioHeight = height;
requestLayout();
}
#Override
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int width = MeasureSpec.getSize(widthMeasureSpec);
final int height = MeasureSpec.getSize(heightMeasureSpec);
if (0 == ratioWidth || 0 == ratioHeight) {
setMeasuredDimension(width, height);
} else {
if (width < height * ratioWidth / ratioHeight) {
setMeasuredDimension(width, width * ratioHeight / ratioWidth);
} else {
setMeasuredDimension(height * ratioWidth / ratioHeight, height);
}
}
}
}
And my overlay currently looks like this (circle colour current set to black for debugging:
package org.tensorflow.demo;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
public class OverlayView extends View {
private final Paint transparentPaint;
public OverlayView(final Context context, final AttributeSet attrs) {
super(context, attrs);
transparentPaint = new Paint();
transparentPaint.setColor(getResources().getColor(android.R.color.black));
}
#Override
public void onDraw(final Canvas canvas) {
int w = getWidth();
int h = getHeight();
int pl = getPaddingLeft();
int pr = getPaddingRight();
int pt = getPaddingTop();
int pb = getPaddingBottom();
int usableWidth = w - (pl + pr);
int usableHeight = h - (pt + pb);
int radius = Math.min(usableWidth, usableHeight) / 2;
int cx = pl + (usableWidth / 2);
int cy = pt + (usableHeight / 2);
canvas.drawCircle(cx, cy, radius, transparentPaint);
}
}
Lastly I've got my layout xml as such:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<org.tensorflow.demo.AutoFitTextureView
android:id="#+id/texture"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<org.tensorflow.demo.OverlayView
android:id="#+id/overlay"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<org.tensorflow.demo.RecognitionScoreView
android:id="#+id/results"
android:layout_width="match_parent"
android:layout_height="112dp" />
</FrameLayout>

Ended up solving this using a PorterDuff.Mode.SRC_OUT to cut out a circle from a full screen rectangle:
protected void createWindowFrame() {
int w = getWidth();
int h = getHeight();
windowFrame = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas osCanvas = new Canvas(windowFrame);
RectF outerRectangle = new RectF(0, 0, getWidth(), getHeight());
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.parseColor("#4885ed"));
osCanvas.drawRect(outerRectangle, paint);
paint.setColor(Color.TRANSPARENT);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT));
int pl = getPaddingLeft();
int pr = getPaddingRight();
int pt = getPaddingTop();
int pb = getPaddingBottom();
int usableWidth = w - (pl + pr);
int usableHeight = h - (pt + pb);
int radius = Math.min(usableWidth, usableHeight) / 2;
int cx = pl + (usableWidth / 2);
int cy = pt + (usableHeight / 2);
osCanvas.drawCircle(cx, cy, radius, paint);
}

Implement Chips without search functionality

I want to implement chip something like this:
chip
But since I've a predefined Array Adapter & just need to put its values into this chip & I want to set these chips to a Textview or simply View. I've tried many chip libraries but all of them gave some kind of error while adding to dependencies.
I just need to implement chips for the look of the app & not search functionality so can anyone help me in this & if you have any better ideas then please feel free to share.

Finally I did it like this with the help of a nine patch image chip.9.png & FlowLayout:
MainActivity:
LinearLayout llTemp = new LinearLayout(this);
llTemp.setOrientation(LinearLayout.HORIZONTAL);
llTemp.setBackgroundResource(R.drawable.chip);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
llTemp.setLayoutParams(params);
llTemp.setGravity(Gravity.CENTER_VERTICAL);
TextView tv = new TextView(this);
tv.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
tv.setPadding(0, 0, 5, 0);
tv.setText("Some text");
CircularImageView iv = new CircularImageView(this);
LinearLayout.LayoutParams ivParams = new LinearLayout.LayoutParams(50, 50);
ivParams.setMargins(0, 0, 5, 0);
iv.setLayoutParams(ivParams);
iv.setBorderWidth(0);
Picasso.with(this).load(IMAGE_LINK + IMAGE_FILE).into(iv);
ImageView ivCloseBtn = new ImageView(this);
ivCloseBtn.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
ivCloseBtn.setPadding(2, 2, 2, 2);
ivCloseBtn.setBackgroundResource(R.drawable.icon_close);
FlowLayout.java:
public class FlowLayout extends ViewGroup {
private int paddingHorizontal;
private int paddingVertical;
public FlowLayout(Context context) {
super(context);
init();
}
public FlowLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FlowLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
paddingHorizontal = getResources().getDimensionPixelSize(R.dimen.flowlayout_horizontal_padding);
paddingVertical = getResources().getDimensionPixelSize(R.dimen.flowlayout_vertical_padding);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int childLeft = getPaddingLeft();
int childTop = getPaddingTop();
int lineHeight = 0;
// 100 is a dummy number, widthMeasureSpec should always be EXACTLY for FlowLayout
int myWidth = resolveSize(100, widthMeasureSpec);
int wantedHeight = 0;
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
if (child.getVisibility() == View.GONE) {
continue;
}
// let the child measure itself
child.measure(
getChildMeasureSpec(widthMeasureSpec, 0, child.getLayoutParams().width),
getChildMeasureSpec(heightMeasureSpec, 0, child.getLayoutParams().height));
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
// lineheight is the height of current line, should be the height of the highest view
lineHeight = Math.max(childHeight, lineHeight);
if (childWidth + childLeft + getPaddingRight() > myWidth) {
// wrap this line
childLeft = getPaddingLeft();
childTop += paddingVertical + lineHeight;
lineHeight = childHeight;
}
childLeft += childWidth + paddingHorizontal;
}
wantedHeight += childTop + lineHeight + getPaddingBottom();
setMeasuredDimension(myWidth, resolveSize(wantedHeight, heightMeasureSpec));
}
#Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
int childLeft = getPaddingLeft();
int childTop = getPaddingTop();
int lineHeight = 0;
int myWidth = right - left;
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
if (child.getVisibility() == View.GONE) {
continue;
}
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
lineHeight = Math.max(childHeight, lineHeight);
if (childWidth + childLeft + getPaddingRight() > myWidth) {
childLeft = getPaddingLeft();
childTop += paddingVertical + lineHeight;
lineHeight = childHeight;
}
child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
childLeft += childWidth + paddingHorizontal;
}
}}
& then in Main Activity: flowLayout.addView(llTemp)
& flow layout within xml file(mainactivity):
<ScrollView android:id="#+id/sv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="gone">
<com.example.FlowLayout
android:id="#+id/fl"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</ScrollView>
Final Product: final_chip_image

While using a custom flow layout the click events are not being propagated on all devices

I am using a custom layout to display a varied number of buttons and intercept their clicks. Here is the source code for the custom layout:
import android.content.Context;
import android.content.res.TypedArray;
import android.database.DataSetObserver;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
public class FlowLayout extends AdapterView<Adapter> {
public static final int HORIZONTAL = 0;
public static final int VERTICAL = 1;
private static final int INVALID_INDEX = -1;
private static final int TOUCH_STATE_RESTING = 0;
private static final int TOUCH_STATE_CLICK = 1;
private int mTouchState = TOUCH_STATE_RESTING;
private Rect mRect;
private Runnable mLongPressRunnable;
private int mTouchStartX;
private int mTouchStartY;
private int horizontalSpacing = 0;
private int verticalSpacing = 0;
private int orientation = 0;
private boolean debugDraw = false;
private Adapter mAdapter;
private final AdapterObserver mObserver = new AdapterObserver();
public FlowLayout(Context context) {
super(context);
this.readStyleParameters(context, null);
}
public FlowLayout(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
this.readStyleParameters(context, attributeSet);
}
public FlowLayout(Context context, AttributeSet attributeSet, int defStyle) {
super(context, attributeSet, defStyle);
this.readStyleParameters(context, attributeSet);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec) - this.getPaddingRight() - this.getPaddingLeft();
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec) - this.getPaddingRight() - this.getPaddingLeft();
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
int size;
int mode;
if (orientation == HORIZONTAL) {
size = sizeWidth;
mode = modeWidth;
} else {
size = sizeHeight;
mode = modeHeight;
}
int lineThicknessWithSpacing = 0;
int lineThickness = 0;
int lineLengthWithSpacing = 0;
int lineLength;
int prevLinePosition = 0;
int controlMaxLength = 0;
int controlMaxThickness = 0;
final int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == GONE) {
continue;
}
child.measure(
MeasureSpec.makeMeasureSpec(sizeWidth, modeWidth == MeasureSpec.EXACTLY ? MeasureSpec.AT_MOST : modeWidth),
MeasureSpec.makeMeasureSpec(sizeHeight, modeHeight == MeasureSpec.EXACTLY ? MeasureSpec.AT_MOST : modeHeight)
);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
int hSpacing = this.getHorizontalSpacing(lp);
int vSpacing = this.getVerticalSpacing(lp);
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
int childLength;
int childThickness;
int spacingLength;
int spacingThickness;
if (orientation == HORIZONTAL) {
childLength = childWidth;
childThickness = childHeight;
spacingLength = hSpacing;
spacingThickness = vSpacing;
} else {
childLength = childHeight;
childThickness = childWidth;
spacingLength = vSpacing;
spacingThickness = hSpacing;
}
lineLength = lineLengthWithSpacing + childLength;
lineLengthWithSpacing = lineLength + spacingLength;
boolean newLine = lp.newLine || (mode != MeasureSpec.UNSPECIFIED && lineLength > size);
if (newLine) {
prevLinePosition = prevLinePosition + lineThicknessWithSpacing;
lineThickness = childThickness;
lineLength = childLength;
lineThicknessWithSpacing = childThickness + spacingThickness;
lineLengthWithSpacing = lineLength + spacingLength;
}
lineThicknessWithSpacing = Math.max(lineThicknessWithSpacing, childThickness + spacingThickness);
lineThickness = Math.max(lineThickness, childThickness);
int posX;
int posY;
if (orientation == HORIZONTAL) {
posX = getPaddingLeft() + lineLength - childLength;
posY = getPaddingTop() + prevLinePosition;
} else {
posX = getPaddingLeft() + prevLinePosition;
posY = getPaddingTop() + lineLength - childHeight;
}
lp.setPosition(posX, posY);
controlMaxLength = Math.max(controlMaxLength, lineLength);
controlMaxThickness = prevLinePosition + lineThickness;
}
if (orientation == HORIZONTAL) {
this.setMeasuredDimension(resolveSize(controlMaxLength, widthMeasureSpec), resolveSize(controlMaxThickness, heightMeasureSpec));
} else {
this.setMeasuredDimension(resolveSize(controlMaxThickness, widthMeasureSpec), resolveSize(controlMaxLength, heightMeasureSpec));
}
}
private int getVerticalSpacing(LayoutParams lp) {
int vSpacing;
if (lp.verticalSpacingSpecified()) {
vSpacing = lp.verticalSpacing;
} else {
vSpacing = this.verticalSpacing;
}
return vSpacing;
}
private int getHorizontalSpacing(LayoutParams lp) {
int hSpacing;
if (lp.horizontalSpacingSpecified()) {
hSpacing = lp.horizontalSpacing;
} else {
hSpacing = this.horizontalSpacing;
}
return hSpacing;
}
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int count = getChildCount();
for (int i = 0; i < count; i++) {
View child = getChildAt(i);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
child.layout(lp.x, lp.y, lp.x + child.getMeasuredWidth(), lp.y + child.getMeasuredHeight());
}
}
#Override
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
boolean more = super.drawChild(canvas, child, drawingTime);
this.drawDebugInfo(canvas, child);
return more;
}
#Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof LayoutParams;
}
#Override
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
#Override
public LayoutParams generateLayoutParams(AttributeSet attributeSet) {
return new LayoutParams(getContext(), attributeSet);
}
#Override
protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return new LayoutParams(p);
}
private void readStyleParameters(Context context, AttributeSet attributeSet) {
TypedArray a = context.obtainStyledAttributes(attributeSet, R.styleable.FlowLayout);
try {
horizontalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_horizontalSpacing, 0);
verticalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_verticalSpacing, 0);
orientation = a.getInteger(R.styleable.FlowLayout_orientation, HORIZONTAL);
debugDraw = a.getBoolean(R.styleable.FlowLayout_debugDraw, false);
} finally {
a.recycle();
}
}
private void drawDebugInfo(Canvas canvas, View child) {
if (!debugDraw) {
return;
}
Paint childPaint = this.createPaint(0xffffff00);
Paint layoutPaint = this.createPaint(0xff00ff00);
Paint newLinePaint = this.createPaint(0xffff0000);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (lp.horizontalSpacing > 0) {
float x = child.getRight();
float y = child.getTop() + child.getHeight() / 2.0f;
canvas.drawLine(x, y, x + lp.horizontalSpacing, y, childPaint);
canvas.drawLine(x + lp.horizontalSpacing - 4.0f, y - 4.0f, x + lp.horizontalSpacing, y, childPaint);
canvas.drawLine(x + lp.horizontalSpacing - 4.0f, y + 4.0f, x + lp.horizontalSpacing, y, childPaint);
} else if (this.horizontalSpacing > 0) {
float x = child.getRight();
float y = child.getTop() + child.getHeight() / 2.0f;
canvas.drawLine(x, y, x + this.horizontalSpacing, y, layoutPaint);
canvas.drawLine(x + this.horizontalSpacing - 4.0f, y - 4.0f, x + this.horizontalSpacing, y, layoutPaint);
canvas.drawLine(x + this.horizontalSpacing - 4.0f, y + 4.0f, x + this.horizontalSpacing, y, layoutPaint);
}
if (lp.verticalSpacing > 0) {
float x = child.getLeft() + child.getWidth() / 2.0f;
float y = child.getBottom();
canvas.drawLine(x, y, x, y + lp.verticalSpacing, childPaint);
canvas.drawLine(x - 4.0f, y + lp.verticalSpacing - 4.0f, x, y + lp.verticalSpacing, childPaint);
canvas.drawLine(x + 4.0f, y + lp.verticalSpacing - 4.0f, x, y + lp.verticalSpacing, childPaint);
} else if (this.verticalSpacing > 0) {
float x = child.getLeft() + child.getWidth() / 2.0f;
float y = child.getBottom();
canvas.drawLine(x, y, x, y + this.verticalSpacing, layoutPaint);
canvas.drawLine(x - 4.0f, y + this.verticalSpacing - 4.0f, x, y + this.verticalSpacing, layoutPaint);
canvas.drawLine(x + 4.0f, y + this.verticalSpacing - 4.0f, x, y + this.verticalSpacing, layoutPaint);
}
if (lp.newLine) {
if (orientation == HORIZONTAL) {
float x = child.getLeft();
float y = child.getTop() + child.getHeight() / 2.0f;
canvas.drawLine(x, y - 6.0f, x, y + 6.0f, newLinePaint);
} else {
float x = child.getLeft() + child.getWidth() / 2.0f;
float y = child.getTop();
canvas.drawLine(x - 6.0f, y, x + 6.0f, y, newLinePaint);
}
}
}
private Paint createPaint(int color) {
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(color);
paint.setStrokeWidth(2.0f);
return paint;
}
public static class LayoutParams extends ViewGroup.LayoutParams {
private static int NO_SPACING = -1;
private int x;
private int y;
private int horizontalSpacing = NO_SPACING;
private int verticalSpacing = NO_SPACING;
private boolean newLine = false;
public LayoutParams(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
this.readStyleParameters(context, attributeSet);
}
public LayoutParams(int width, int height) {
super(width, height);
}
public LayoutParams(ViewGroup.LayoutParams layoutParams) {
super(layoutParams);
}
public boolean horizontalSpacingSpecified() {
return horizontalSpacing != NO_SPACING;
}
public boolean verticalSpacingSpecified() {
return verticalSpacing != NO_SPACING;
}
public void setHorizontalSpacing(int hs) {
horizontalSpacing = hs;
}
public void setVerticalSpacing(int vs) {
verticalSpacing = vs;
}
public void setPosition(int x, int y) {
this.x = x;
this.y = y;
}
private void readStyleParameters(Context context, AttributeSet attributeSet) {
TypedArray a = context.obtainStyledAttributes(attributeSet, R.styleable.FlowLayout_LayoutParams);
try {
horizontalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_LayoutParams_layout_horizontalSpacing, NO_SPACING);
verticalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_LayoutParams_layout_verticalSpacing, NO_SPACING);
newLine = a.getBoolean(R.styleable.FlowLayout_LayoutParams_layout_newLine, false);
} finally {
a.recycle();
}
}
}
#Override
public Adapter getAdapter() {
return mAdapter;
}
#Override
public View getSelectedView() {
throw new UnsupportedOperationException("Not supported");
}
#Override
public void setAdapter(Adapter adapter) {
if (mAdapter != null) {
mAdapter.unregisterDataSetObserver(mObserver);
}
mAdapter = adapter;
mAdapter.registerDataSetObserver(mObserver);
refresh();
}
public void refresh() {
removeAllViewsInLayout();
for (int i = 0; i < mAdapter.getCount(); i++) {
final View view = mAdapter.getView(i, null, this);
ViewGroup.LayoutParams params = view.getLayoutParams();
if (params == null) {
params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
addViewInLayout(view, i, params, true);
}
postInvalidate();
requestLayout();
}
public class AdapterObserver extends DataSetObserver {
#Override
public void onChanged() {
refresh();
}
#Override
public void onInvalidated() {
}
}
#Override
public void setSelection(int position) {
throw new UnsupportedOperationException("Not supported");
}
// Touch detection
#Override
public boolean onTouchEvent(MotionEvent event) {
if (getChildCount() == 0) {
return false;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
startTouch(event);
break;
case MotionEvent.ACTION_UP:
if (mTouchState == TOUCH_STATE_CLICK) {
clickChildAt((int)event.getX(), (int)event.getY());
}
endTouch();
break;
default:
endTouch();
break;
}
return true;
}
/**
* Sets and initializes all things that need to when we start a touch
* gesture.
*
* #param event The down event
*/
private void startTouch(final MotionEvent event) {
mTouchStartX = (int)event.getX();
mTouchStartY = (int)event.getY();
startLongPressCheck();
mTouchState = TOUCH_STATE_CLICK;
}
private void startLongPressCheck() {
if (mLongPressRunnable == null) {
mLongPressRunnable = new Runnable() {
public void run() {
if (mTouchState == TOUCH_STATE_CLICK) {
final int index = getContainingChildIndex(mTouchStartX, mTouchStartY);
if (index != INVALID_INDEX) { longClickChild(index); mTouchState = TOUCH_STATE_RESTING; }
}
}
};
}
postDelayed(mLongPressRunnable, 300); //ViewConfiguration.getLongPressTimeout()
}
private void longClickChild(final int index) {
final View itemView = getChildAt(index);
final int position = index;
final long id = mAdapter.getItemId(position);
final OnItemLongClickListener listener = getOnItemLongClickListener();
if (listener != null) { listener.onItemLongClick(this, itemView, position, id); }
}
private int getContainingChildIndex(final int x, final int y) {
if (mRect == null) { mRect = new Rect(); }
for (int index = 0; index < getChildCount(); index++) {
getChildAt(index).getHitRect(mRect);
if (mRect.contains(x, y)) { return index; }
}
return INVALID_INDEX;
}
private void endTouch() {
removeCallbacks(mLongPressRunnable);
mTouchState = TOUCH_STATE_RESTING;
}
private void clickChildAt(final int x, final int y) {
final int index = getContainingChildIndex(x, y);
if (index != INVALID_INDEX) {
final View itemView = getChildAt(index);
final int position = index;
final long id = mAdapter.getItemId(position);
performItemClick(itemView, position, id);
}
}
}
This code works on my test device which is a Google Nexus S with Android 4.1.2, meaning that the buttons are clickable. Yet I got reports that the buttons are unresponsive on other devices such as Android Casio C771 with Android version 2.3.3 and Verizon LG VS840 with Android 4.0.4.
Can you please tell me what could cause this discrepancy and how can I fix it?
Thank you

Things to look out for:
It is essential that the Views created for the adapter are enabled for click and touch action. After they are created:
View.setEnabled(true);
When you create the AdapterView and the BaseApapter, remember to both setOnItemClickListener and setOnItemLongClickListener if you want to handle long clicks, which it seems you do.
In the endTouch routine, you need to set mLongPressRunnable to null, so it will be created for the next touch (or lose the null check in startLongPressCheck and handle concurency issues another way).
The runnable created in startLongPressCheck needs to call endTouch when complete to reset everything to the right, nothing pending, state after the long press time period.
In the onTouchEvent switch statement, it is important to not call your endTouch routine, because this means that movement events may stop the click.
There is a suggestion (see Android onClick method doesn't work on a custom view) that if you don't call super.onTouchEvent(event) in your onTouchEvent it can cause problems. This would look something like:
#Override
public boolean onTouchEvent(MotionEvent event) {
if (getChildCount() == 0) {
return super.onTouchEvent(event);
}
boolean handled = false;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
startTouch(event);
handled = true;
break;
case MotionEvent.ACTION_UP:
if (mTouchState == TOUCH_STATE_CLICK) {
clickChildAt((int)event.getX(), (int)event.getY());
handled = true;
}
endTouch();
break;
default:
// Do not do anything dramatic here because the system
// may send different (eg. motion) information here which
// may lead to you losing valid clicks if you simply cancel
// the click in process.
break;
}
if (handled == false) handled = super.onTouchEvent(event);
return handled;
}

android full screen textview [duplicate]

Is there any way in android to adjust the textsize in a textview to fit the space it occupies?
E.g. I'm using a TableLayout and adding several TextViews to each row. Since I don't want the TextViews to wrap the text I rather see that it lowers the font size of the content.
Any ideas?
I have tried measureText, but since I don't know the size of the column it seems troublesome to use.
This is the code where I want to change the font size to something that fits
TableRow row = new TableRow(this);
for (int i=0; i < ColumnNames.length; i++) {
TextView textColumn = new TextView(this);
textColumn.setText(ColumnNames[i]);
textColumn.setPadding(0, 0, 1, 0);
textColumn.setTextColor(getResources().getColor(R.drawable.text_default));
row.addView(textColumn, new TableRow.LayoutParams());
}
table.addView(row, new TableLayout.LayoutParams());

The solution below incorporates all of the suggestions here. It starts with what was originally posted by Dunni. It uses a binary search like gjpc's, but it is a bit more readable. It also include's gregm's bug fixes and a bug-fix of my own.
import android.content.Context;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
public class FontFitTextView extends TextView {
public FontFitTextView(Context context) {
super(context);
initialise();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialise();
}
private void initialise() {
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
//max size defaults to the initially specified text size unless it is too small
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth)
{
if (textWidth <= 0)
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
float hi = 100;
float lo = 2;
final float threshold = 0.5f; // How close we have to be
mTestPaint.set(this.getPaint());
while((hi - lo) > threshold) {
float size = (hi+lo)/2;
mTestPaint.setTextSize(size);
if(mTestPaint.measureText(text) >= targetWidth)
hi = size; // too big
else
lo = size; // too small
}
// Use lo so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, lo);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth);
this.setMeasuredDimension(parentWidth, height);
}
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
refitText(text.toString(), this.getWidth());
}
#Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
if (w != oldw) {
refitText(this.getText().toString(), w);
}
}
//Attributes
private Paint mTestPaint;
}

I've written a class that extends TextView and does this. It just uses measureText as you suggest. Basically it has a maximum text size and minimum text size (which can be changed) and it just runs through the sizes between them in decrements of 1 until it finds the biggest one that will fit. Not particularly elegant, but I don't know of any other way.
Here is the code:
import android.content.Context;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;
public class FontFitTextView extends TextView {
public FontFitTextView(Context context) {
super(context);
initialise();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialise();
}
private void initialise() {
testPaint = new Paint();
testPaint.set(this.getPaint());
//max size defaults to the intially specified text size unless it is too small
maxTextSize = this.getTextSize();
if (maxTextSize < 11) {
maxTextSize = 20;
}
minTextSize = 10;
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth) {
if (textWidth > 0) {
int availableWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
float trySize = maxTextSize;
testPaint.setTextSize(trySize);
while ((trySize > minTextSize) && (testPaint.measureText(text) > availableWidth)) {
trySize -= 1;
if (trySize <= minTextSize) {
trySize = minTextSize;
break;
}
testPaint.setTextSize(trySize);
}
this.setTextSize(trySize);
}
}
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
refitText(text.toString(), this.getWidth());
}
#Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
if (w != oldw) {
refitText(this.getText().toString(), w);
}
}
//Getters and Setters
public float getMinTextSize() {
return minTextSize;
}
public void setMinTextSize(int minTextSize) {
this.minTextSize = minTextSize;
}
public float getMaxTextSize() {
return maxTextSize;
}
public void setMaxTextSize(int minTextSize) {
this.maxTextSize = minTextSize;
}
//Attributes
private Paint testPaint;
private float minTextSize;
private float maxTextSize;
}

This is speedplane's FontFitTextView, but it only decreases font size if needed to make the text fit, and keeps its font size otherwise. It does not increase the font size to fit height.
public class FontFitTextView extends TextView {
// Attributes
private Paint mTestPaint;
private float defaultTextSize;
public FontFitTextView(Context context) {
super(context);
initialize();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialize();
}
private void initialize() {
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
defaultTextSize = getTextSize();
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth) {
if (textWidth <= 0 || text.isEmpty())
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
// this is most likely a non-relevant call
if( targetWidth<=2 )
return;
// text already fits with the xml-defined font size?
mTestPaint.set(this.getPaint());
mTestPaint.setTextSize(defaultTextSize);
if(mTestPaint.measureText(text) <= targetWidth) {
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, defaultTextSize);
return;
}
// adjust text size using binary search for efficiency
float hi = defaultTextSize;
float lo = 2;
final float threshold = 0.5f; // How close we have to be
while (hi - lo > threshold) {
float size = (hi + lo) / 2;
mTestPaint.setTextSize(size);
if(mTestPaint.measureText(text) >= targetWidth )
hi = size; // too big
else
lo = size; // too small
}
// Use lo so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, lo);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth);
this.setMeasuredDimension(parentWidth, height);
}
#Override
protected void onTextChanged(final CharSequence text, final int start,
final int before, final int after) {
refitText(text.toString(), this.getWidth());
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
if (w != oldw || h != oldh) {
refitText(this.getText().toString(), w);
}
}
}
Here is an example how it could be used in xml:
<com.your.package.activity.widget.FontFitTextView
android:id="#+id/my_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="My Text"
android:textSize="60sp" />
This would keep the font size to 60sp as long as the text fits in width. If the text is longer, it will decrease font size. In this case, the TextViews height will also change because of height=wrap_content.
If you find any bugs, feel free to edit.

Here is my solution which works on emulator and phones but not very well on Eclipse layout editor. It's inspired from kilaka's code but the size of the text is not obtained from the Paint but from measuring the TextView itself calling measure(0, 0).
The Java class :
public class FontFitTextView extends TextView
{
private static final float THRESHOLD = 0.5f;
private enum Mode { Width, Height, Both, None }
private int minTextSize = 1;
private int maxTextSize = 1000;
private Mode mode = Mode.None;
private boolean inComputation;
private int widthMeasureSpec;
private int heightMeasureSpec;
public FontFitTextView(Context context) {
super(context);
}
public FontFitTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FontFitTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray tAttrs = context.obtainStyledAttributes(attrs, R.styleable.FontFitTextView, defStyle, 0);
maxTextSize = tAttrs.getDimensionPixelSize(R.styleable.FontFitTextView_maxTextSize, maxTextSize);
minTextSize = tAttrs.getDimensionPixelSize(R.styleable.FontFitTextView_minTextSize, minTextSize);
tAttrs.recycle();
}
private void resizeText() {
if (getWidth() <= 0 || getHeight() <= 0)
return;
if(mode == Mode.None)
return;
final int targetWidth = getWidth();
final int targetHeight = getHeight();
inComputation = true;
float higherSize = maxTextSize;
float lowerSize = minTextSize;
float textSize = getTextSize();
while(higherSize - lowerSize > THRESHOLD) {
textSize = (higherSize + lowerSize) / 2;
if (isTooBig(textSize, targetWidth, targetHeight)) {
higherSize = textSize;
} else {
lowerSize = textSize;
}
}
setTextSize(TypedValue.COMPLEX_UNIT_PX, lowerSize);
measure(widthMeasureSpec, heightMeasureSpec);
inComputation = false;
}
private boolean isTooBig(float textSize, int targetWidth, int targetHeight) {
setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
measure(0, 0);
if(mode == Mode.Both)
return getMeasuredWidth() >= targetWidth || getMeasuredHeight() >= targetHeight;
if(mode == Mode.Width)
return getMeasuredWidth() >= targetWidth;
else
return getMeasuredHeight() >= targetHeight;
}
private Mode getMode(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
if(widthMode == MeasureSpec.EXACTLY && heightMode == MeasureSpec.EXACTLY)
return Mode.Both;
if(widthMode == MeasureSpec.EXACTLY)
return Mode.Width;
if(heightMode == MeasureSpec.EXACTLY)
return Mode.Height;
return Mode.None;
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if(!inComputation) {
this.widthMeasureSpec = widthMeasureSpec;
this.heightMeasureSpec = heightMeasureSpec;
mode = getMode(widthMeasureSpec, heightMeasureSpec);
resizeText();
}
}
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
resizeText();
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
if (w != oldw || h != oldh)
resizeText();
}
public int getMinTextSize() {
return minTextSize;
}
public void setMinTextSize(int minTextSize) {
this.minTextSize = minTextSize;
resizeText();
}
public int getMaxTextSize() {
return maxTextSize;
}
public void setMaxTextSize(int maxTextSize) {
this.maxTextSize = maxTextSize;
resizeText();
}
}
The XML attribute file :
<resources>
<declare-styleable name="FontFitTextView">
<attr name="minTextSize" format="dimension" />
<attr name="maxTextSize" format="dimension" />
</declare-styleable>
</resources>
Check my github for the latest version of this class.
I hope it can be useful for someone.
If a bug is found or if the code needs explaination, feel free to open an issue on Github.

Thanks a lot to https://stackoverflow.com/users/234270/speedplane. Great answer!
Here is an improved version of his response that also take care of height and comes with a maxFontSize attribute to limit font size (was useful in my case, so I wanted to share it) :
package com.<your_package>;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
public class FontFitTextView extends TextView
{
private Paint mTestPaint;
private float maxFontSize;
private static final float MAX_FONT_SIZE_DEFAULT_VALUE = 20f;
public FontFitTextView(Context context)
{
super(context);
initialise(context, null);
}
public FontFitTextView(Context context, AttributeSet attributeSet)
{
super(context, attributeSet);
initialise(context, attributeSet);
}
public FontFitTextView(Context context, AttributeSet attributeSet, int defStyle)
{
super(context, attributeSet, defStyle);
initialise(context, attributeSet);
}
private void initialise(Context context, AttributeSet attributeSet)
{
if(attributeSet!=null)
{
TypedArray styledAttributes = context.obtainStyledAttributes(attributeSet, R.styleable.FontFitTextView);
maxFontSize = styledAttributes.getDimension(R.styleable.FontFitTextView_maxFontSize, MAX_FONT_SIZE_DEFAULT_VALUE);
styledAttributes.recycle();
}
else
{
maxFontSize = MAX_FONT_SIZE_DEFAULT_VALUE;
}
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
//max size defaults to the initially specified text size unless it is too small
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth, int textHeight)
{
if (textWidth <= 0)
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
int targetHeight = textHeight - this.getPaddingTop() - this.getPaddingBottom();
float hi = maxFontSize;
float lo = 2;
// final float threshold = 0.5f; // How close we have to be
final float threshold = 1f; // How close we have to be
mTestPaint.set(this.getPaint());
Rect bounds = new Rect();
while ((hi - lo) > threshold)
{
float size = (hi + lo) / 2;
mTestPaint.setTextSize(size);
mTestPaint.getTextBounds(text, 0, text.length(), bounds);
if (bounds.width() >= targetWidth || bounds.height() >= targetHeight)
hi = size; // too big
else
lo = size; // too small
// if (mTestPaint.measureText(text) >= targetWidth)
// hi = size; // too big
// else
// lo = size; // too small
}
// Use lo so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, lo);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth, height);
this.setMeasuredDimension(parentWidth, height);
}
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after)
{
refitText(text.toString(), this.getWidth(), this.getHeight());
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
if (w != oldw)
{
refitText(this.getText().toString(), w, h);
}
}
}
Corresponding /res/values/attr.xml file:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="FontFitTextView">
<attr name="maxFontSize" format="dimension" />
</declare-styleable>
</resources>
Example:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:res-auto="http://schemas.android.com/apk/res-auto"
android:id="#+id/home_Layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/background"
tools:ignore="ContentDescription" >
...
<com.<your_package>.FontFitTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true"
android:text="Sample Text"
android:textSize="28sp"
res-auto:maxFontSize="35sp"/>
...
</RelativeLayout>
To use the new maxFontSize attribute, don't forget to add xmlns:res-auto="http://schemas.android.com/apk/res-auto" as show in the example.

You can now do this without a third party library or a widget. It's built into TextView in API level 26. Add android:autoSizeTextType="uniform" to your TextView and set height to it. That's all.
https://developer.android.com/guide/topics/ui/look-and-feel/autosizing-textview.html
<?xml version="1.0" encoding="utf-8"?>
<TextView
android:layout_width="match_parent"
android:layout_height="200dp"
android:autoSizeTextType="uniform" />
You can also use TextViewCompat or app:autoSizeTextType="uniform" for backward compatibility.

I had the same problem and wrote a class that seems to work for me. Basically, I used a static layout to draw the text in a separate canvas and remeasure until I find a font size that fits. You can see the class posted in the topic below. I hope it helps.
Auto Scale TextView Text to Fit within Bounds

Use app:autoSizeTextType="uniform" for backward compatibility because android:autoSizeTextType="uniform" only work in API Level 26 and higher.

Slight modification to onMeasure:
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
refitText(this.getText().toString(), parentWidth);
this.setMeasuredDimension(parentWidth, parentHeight);
}
And binary search on refitText:
private void refitText(String text, int textWidth)
{
if (textWidth > 0)
{
int availableWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
int trySize = (int)maxTextSize;
int increment = ~( trySize - (int)minTextSize ) / 2;
testPaint.setTextSize(trySize);
while ((trySize > minTextSize) && (testPaint.measureText(text) > availableWidth))
{
trySize += increment;
increment = ( increment == 0 ) ? -1 : ~increment / 2;
if (trySize <= minTextSize)
{
trySize = (int)minTextSize;
break;
}
testPaint.setTextSize(trySize);
}
this.setTextSize( TypedValue.COMPLEX_UNIT_PX, trySize);
}
}

I found the following to work nicely for me. It doesn't loop and accounts for both height and width. Note that it is important to specify the PX unit when calling setTextSize on the view. Thanks to the tip in a previous post for this!
Paint paint = adjustTextSize(getPaint(), numChars, maxWidth, maxHeight);
setTextSize(TypedValue.COMPLEX_UNIT_PX,paint.getTextSize());
Here is the routine I use, passing in the getPaint() from the view. A 10 character string with a 'wide' character is used to estimate the width independent from the actual string.
private static final String text10="OOOOOOOOOO";
public static Paint adjustTextSize(Paint paint, int numCharacters, int widthPixels, int heightPixels) {
float width = paint.measureText(text10)*numCharacters/text10.length();
float newSize = (int)((widthPixels/width)*paint.getTextSize());
paint.setTextSize(newSize);
// remeasure with font size near our desired result
width = paint.measureText(text10)*numCharacters/text10.length();
newSize = (int)((widthPixels/width)*paint.getTextSize());
paint.setTextSize(newSize);
// Check height constraints
FontMetricsInt metrics = paint.getFontMetricsInt();
float textHeight = metrics.descent-metrics.ascent;
if (textHeight > heightPixels) {
newSize = (int)(newSize * (heightPixels/textHeight));
paint.setTextSize(newSize);
}
return paint;
}

Works with modification
You need to set the text view size like this because otherwise setTextSize assumes the value is in SP units:
setTextSize(TypedValue.COMPLEX_UNIT_PX, trySize);
And you needed to explicitly add this code.
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
refitText(this.getText().toString(), parentWidth);
}

I had this pain in my projects for soooo long until I found this library:
compile 'me.grantland:autofittextview:0.2.+'
You just need to add the xml by your needs and it's done. For example:
<me.grantland.widget.AutofitTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true"
android:maxLines="2"
android:textSize="40sp"
autofit:minTextSize="16sp"
/>

I used a variation of Dunni solution above, but that particular code didn't work for me. In particular, when trying to use the Paint object set to have the traits of the view's Paint object, and then calling measureText(), it doesn't return the same value as directly calling the view's Paint object. Perhaps there are some differences in the way my views are set up that make the behavior different.
My solution was to directly use the view's Paint, even though there might be some performance penalties in changing the font size for the view multiple times.

I've been working on improving the excellent solution from speedplane, and came up with this. It manages the height, including setting the margin such that the text should be centered correctly vertically.
This uses the same function to get the width, as it seems to work the best, but it uses a different function to get the height, as the height isn't provided anywhere. There are some corrections that need to be made, but I figured out a way to do that, while looking pleasing to the eye.
import android.content.Context;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
public class FontFitTextView extends TextView {
public FontFitTextView(Context context) {
super(context);
initialize();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialize();
}
private void initialize() {
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
//max size defaults to the initially specified text size unless it is too small
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth,int textHeight)
{
if (textWidth <= 0)
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
int targetHeight = textHeight - this.getPaddingTop() - this.getPaddingBottom();
float hi = Math.min(targetHeight,100);
float lo = 2;
final float threshold = 0.5f; // How close we have to be
Rect bounds = new Rect();
mTestPaint.set(this.getPaint());
while((hi - lo) > threshold) {
float size = (hi+lo)/2;
mTestPaint.setTextSize(size);
mTestPaint.getTextBounds(text, 0, text.length(), bounds);
if((mTestPaint.measureText(text)) >= targetWidth || (1+(2*(size+(float)bounds.top)-bounds.bottom)) >=targetHeight)
hi = size; // too big
else
lo = size; // too small
}
// Use lo so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX,(float) lo);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth,height);
this.setMeasuredDimension(parentWidth, height);
}
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
refitText(text.toString(), this.getWidth(),this.getHeight());
}
#Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
if (w != oldw) {
refitText(this.getText().toString(), w,h);
}
}
//Attributes
private Paint mTestPaint;
}

Google already made this feature.
<TextView
android:layout_width="match_parent"
android:layout_height="200dp"
android:autoSizeTextType="uniform" />
https://developer.android.com/guide/topics/ui/look-and-feel/autosizing-textview.html

Inspired by the previous posters I wanted to share my solution. It works with a scale factor which is applied to the previous font size to make it fit the available space. In addition to prevent unexpected behaviour of TextViews onDraw method, it simply draws the text on its own.
public class FontFitTextView extends TextView {
// How much of the available space should be used in percent.
private static final float MARGINHEIGHT = 0.8f;
private static final float MARGINWIDTH = 0.8f;
private Paint paint;
private int viewWidth;
private int viewHeight;
private float textHeight;
private float textWidth;
public FontFitTextView(Context c) {
this(c, null);
}
public FontFitTextView(Context c, AttributeSet attrs) {
super(c, attrs);
initComponent();
}
// Default constructor override
public FontFitTextView(Context c, AttributeSet attrs, int defStyle) {
super(c, attrs, defStyle);
initComponent();
}
private void initComponent() {
paint = new Paint();
paint.setTextSize(30);
paint.setTextAlign(Align.CENTER);
paint.setAntiAlias(true);
}
public void setFontColor(int c) {
paint.setColor(c);
}
private void calcTextSize(String s, Canvas c) {
float availableHeight = viewHeight;
float availableWidth = viewWidth;
// This value scales the old font up or down to match the available
// space.
float scale = 1.0f;
// Rectangle for measuring the text dimensions
Rect rect = new Rect();
float oldFontSize = paint.getTextSize();
// Calculate the space used with old font size
paint.getTextBounds(s, 0, s.length(), rect);
textWidth = rect.width();
textHeight = rect.height();
// find scale-value to fit the text horizontally
float scaleWidth = 1f;
if (textWidth > 0.0f) {
scaleWidth = (availableWidth) / textWidth * MARGINWIDTH;
}
// find scale-value to fit the text vertically
float scaleHeight = 1f;
if (textHeight > 0.0f) {
scaleHeight = (availableHeight) / textHeight * MARGINHEIGHT;
}
// We are always limited by the smaller one
if (scaleWidth < scaleHeight) {
scale = scaleWidth;
} else {
scale = scaleHeight;
}
// We apply the scale to the old font size to make it bigger or smaller
float newFontSize = (oldFontSize * scale);
paint.setTextSize(newFontSize);
}
/**
* Calculates the origin on the Y-Axis (width) for the text in this view.
*
* #return
*/
private float calcStartDrawingPosX() {
float left = getMeasuredWidth();
float centerY = left - (viewWidth / 2);
return centerY;
}
/**
* Calculates the origin on the Y-Axis (height) for the text in this view.
*
* #return
*/
private float calcStartDrawingPosY() {
float bottom = getMeasuredHeight();
// The paint only centers horizontally, origin on the Y-Axis stays at
// the bottom, thus we have to lift the origin additionally by the
// height of the font.
float centerX = bottom - (viewHeight / 2) + (textHeight / 2);
return centerX;
}
#Override
protected void onDraw(Canvas canvas) {
String text = getText().toString();
if (text.length() > 0) {
calcTextSize(text, canvas);
canvas.drawText(text, calcStartDrawingPosX(),
calcStartDrawingPosY(), paint);
}
};
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
viewWidth = w;
viewHeight = h;
super.onSizeChanged(w, h, oldw, oldh);
}
}

/* get your context */
Context c = getActivity().getApplicationContext();
LinearLayout l = new LinearLayout(c);
l.setOrientation(LinearLayout.VERTICAL);
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 0);
l.setLayoutParams(params);
l.setBackgroundResource(R.drawable.border);
TextView tv=new TextView(c);
tv.setText(" your text here");
/* set typeface if needed */
Typeface tf = Typeface.createFromAsset(c.getAssets(),"fonts/VERDANA.TTF");
tv.setTypeface(tf);
// LayoutParams lp = new LayoutParams();
tv.setTextColor(Color.parseColor("#282828"));
tv.setGravity(Gravity.CENTER | Gravity.BOTTOM);
// tv.setLayoutParams(lp);
tv.setTextSize(20);
l.addView(tv);
return l;

This should be a simple solution:
public void correctWidth(TextView textView, int desiredWidth)
{
Paint paint = new Paint();
Rect bounds = new Rect();
paint.setTypeface(textView.getTypeface());
float textSize = textView.getTextSize();
paint.setTextSize(textSize);
String text = textView.getText().toString();
paint.getTextBounds(text, 0, text.length(), bounds);
while (bounds.width() > desiredWidth)
{
textSize--;
paint.setTextSize(textSize);
paint.getTextBounds(text, 0, text.length(), bounds);
}
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
}

Extend TextView and override onDraw with the code below. It will keep text aspect ratio but size it to fill the space. You could easily modify code to stretch if necessary.
#Override
protected void onDraw(#NonNull Canvas canvas) {
TextPaint textPaint = getPaint();
textPaint.setColor(getCurrentTextColor());
textPaint.setTextAlign(Paint.Align.CENTER);
textPaint.drawableState = getDrawableState();
String text = getText().toString();
float desiredWidth = getMeasuredWidth() - getPaddingLeft() - getPaddingRight() - 2;
float desiredHeight = getMeasuredHeight() - getPaddingTop() - getPaddingBottom() - 2;
float textSize = textPaint.getTextSize();
for (int i = 0; i < 10; i++) {
textPaint.getTextBounds(text, 0, text.length(), rect);
float width = rect.width();
float height = rect.height();
float deltaWidth = width - desiredWidth;
float deltaHeight = height - desiredHeight;
boolean fitsWidth = deltaWidth <= 0;
boolean fitsHeight = deltaHeight <= 0;
if ((fitsWidth && Math.abs(deltaHeight) < 1.0)
|| (fitsHeight && Math.abs(deltaWidth) < 1.0)) {
// close enough
break;
}
float adjustX = desiredWidth / width;
float adjustY = desiredHeight / height;
textSize = textSize * (adjustY < adjustX ? adjustY : adjustX);
// adjust text size
textPaint.setTextSize(textSize);
}
float x = desiredWidth / 2f;
float y = desiredHeight / 2f - rect.top - rect.height() / 2f;
canvas.drawText(text, x, y, textPaint);
}

I wrote a short helper class that makes a textview fit within a certain width and adds ellipsize "..." at the end if the minimum textsize cannot be achieved.
Keep in mind that it only makes the text smaller until it fits or until the minimum text size is reached. To test with large sizes, set the textsize to a large number before calling the help method.
It takes Pixels, so if you are using values from dimen, you can call it like this:
float minTextSizePx = getResources().getDimensionPixelSize(R.dimen.min_text_size);
float maxTextWidthPx = getResources().getDimensionPixelSize(R.dimen.max_text_width);
WidgetUtils.fitText(textView, text, minTextSizePx, maxTextWidthPx);
This is the class I use:
public class WidgetUtils {
public static void fitText(TextView textView, String text, float minTextSizePx, float maxWidthPx) {
textView.setEllipsize(null);
int size = (int)textView.getTextSize();
while (true) {
Rect bounds = new Rect();
Paint textPaint = textView.getPaint();
textPaint.getTextBounds(text, 0, text.length(), bounds);
if(bounds.width() < maxWidthPx){
break;
}
if (size <= minTextSizePx) {
textView.setEllipsize(TextUtils.TruncateAt.END);
break;
}
size -= 1;
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
}
}
}

If a tranformation like allCaps is set, speedplane's approach is buggy. I fixed it, resulting in the following code (sorry, my reputation does not allow me to add this as a comment to speedplane's solution):
import android.content.Context;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
public class FontFitTextView extends TextView {
public FontFitTextView(Context context) {
super(context);
initialise();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialise();
}
private void initialise() {
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
//max size defaults to the initially specified text size unless it is too small
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth)
{
if (getTransformationMethod() != null) {
text = getTransformationMethod().getTransformation(text, this).toString();
}
if (textWidth <= 0)
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
float hi = 100;
float lo = 2;
final float threshold = 0.5f; // How close we have to be
mTestPaint.set(this.getPaint());
while((hi - lo) > threshold) {
float size = (hi+lo)/2;
if(mTestPaint.measureText(text) >= targetWidth)
hi = size; // too big
else
lo = size; // too small
}
// Use lo so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, lo);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth);
this.setMeasuredDimension(parentWidth, height);
}
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
refitText(text.toString(), this.getWidth());
}
#Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
if (w != oldw) {
refitText(this.getText().toString(), w);
}
}
//Attributes
private Paint mTestPaint;
}

I don't known this is correct way or not bt its working ...take your view and check OnGlobalLayoutListener() and get textview linecount then set textSize.
yourView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
if (textView.getLineCount()>=3) {
textView.setTextSize(20);
}else{
//add somthing
}
}
});
Its very simple few line code..

In my case using app:autoSize was not solving all cases, for example it doesn't prevent word breaking
This is what I ended up using, it will resize down the text so that there are no word breaks on multiple lines
/**
* Resizes down the text size so that there are no word breaks
*/
class AutoFitTextView #JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyleAttr: Int = 0
) : AppCompatTextView(context, attrs, defStyleAttr) {
private val paint = Paint()
private val bounds = Rect()
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec)
var shouldResize = false
paint.typeface = typeface
var textSize = textSize
paint.textSize = textSize
val biggestWord: String = text.split(" ").maxByOrNull { it.count() } ?: return
// Set bounds equal to the biggest word bounds
paint.getTextBounds(biggestWord, 0, biggestWord.length, bounds)
// Iterate to reduce the text size so that it makes the biggest word fit the line
while ((bounds.width() + paddingStart + paddingEnd + paint.fontSpacing) > measuredWidth) {
textSize--
paint.textSize = textSize
paint.getTextBounds(biggestWord, 0, biggestWord.length, bounds)
shouldResize = true
}
if (shouldResize) {
setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize)
}
}
}

How to adjust text font size to fit textview

Is there any way in android to adjust the textsize in a textview to fit the space it occupies?
E.g. I'm using a TableLayout and adding several TextViews to each row. Since I don't want the TextViews to wrap the text I rather see that it lowers the font size of the content.
Any ideas?
I have tried measureText, but since I don't know the size of the column it seems troublesome to use.
This is the code where I want to change the font size to something that fits
TableRow row = new TableRow(this);
for (int i=0; i < ColumnNames.length; i++) {
TextView textColumn = new TextView(this);
textColumn.setText(ColumnNames[i]);
textColumn.setPadding(0, 0, 1, 0);
textColumn.setTextColor(getResources().getColor(R.drawable.text_default));
row.addView(textColumn, new TableRow.LayoutParams());
}
table.addView(row, new TableLayout.LayoutParams());

The solution below incorporates all of the suggestions here. It starts with what was originally posted by Dunni. It uses a binary search like gjpc's, but it is a bit more readable. It also include's gregm's bug fixes and a bug-fix of my own.
import android.content.Context;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
public class FontFitTextView extends TextView {
public FontFitTextView(Context context) {
super(context);
initialise();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialise();
}
private void initialise() {
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
//max size defaults to the initially specified text size unless it is too small
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth)
{
if (textWidth <= 0)
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
float hi = 100;
float lo = 2;
final float threshold = 0.5f; // How close we have to be
mTestPaint.set(this.getPaint());
while((hi - lo) > threshold) {
float size = (hi+lo)/2;
mTestPaint.setTextSize(size);
if(mTestPaint.measureText(text) >= targetWidth)
hi = size; // too big
else
lo = size; // too small
}
// Use lo so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, lo);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth);
this.setMeasuredDimension(parentWidth, height);
}
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
refitText(text.toString(), this.getWidth());
}
#Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
if (w != oldw) {
refitText(this.getText().toString(), w);
}
}
//Attributes
private Paint mTestPaint;
}

I've written a class that extends TextView and does this. It just uses measureText as you suggest. Basically it has a maximum text size and minimum text size (which can be changed) and it just runs through the sizes between them in decrements of 1 until it finds the biggest one that will fit. Not particularly elegant, but I don't know of any other way.
Here is the code:
import android.content.Context;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;
public class FontFitTextView extends TextView {
public FontFitTextView(Context context) {
super(context);
initialise();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialise();
}
private void initialise() {
testPaint = new Paint();
testPaint.set(this.getPaint());
//max size defaults to the intially specified text size unless it is too small
maxTextSize = this.getTextSize();
if (maxTextSize < 11) {
maxTextSize = 20;
}
minTextSize = 10;
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth) {
if (textWidth > 0) {
int availableWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
float trySize = maxTextSize;
testPaint.setTextSize(trySize);
while ((trySize > minTextSize) && (testPaint.measureText(text) > availableWidth)) {
trySize -= 1;
if (trySize <= minTextSize) {
trySize = minTextSize;
break;
}
testPaint.setTextSize(trySize);
}
this.setTextSize(trySize);
}
}
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
refitText(text.toString(), this.getWidth());
}
#Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
if (w != oldw) {
refitText(this.getText().toString(), w);
}
}
//Getters and Setters
public float getMinTextSize() {
return minTextSize;
}
public void setMinTextSize(int minTextSize) {
this.minTextSize = minTextSize;
}
public float getMaxTextSize() {
return maxTextSize;
}
public void setMaxTextSize(int minTextSize) {
this.maxTextSize = minTextSize;
}
//Attributes
private Paint testPaint;
private float minTextSize;
private float maxTextSize;
}

This is speedplane's FontFitTextView, but it only decreases font size if needed to make the text fit, and keeps its font size otherwise. It does not increase the font size to fit height.
public class FontFitTextView extends TextView {
// Attributes
private Paint mTestPaint;
private float defaultTextSize;
public FontFitTextView(Context context) {
super(context);
initialize();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialize();
}
private void initialize() {
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
defaultTextSize = getTextSize();
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth) {
if (textWidth <= 0 || text.isEmpty())
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
// this is most likely a non-relevant call
if( targetWidth<=2 )
return;
// text already fits with the xml-defined font size?
mTestPaint.set(this.getPaint());
mTestPaint.setTextSize(defaultTextSize);
if(mTestPaint.measureText(text) <= targetWidth) {
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, defaultTextSize);
return;
}
// adjust text size using binary search for efficiency
float hi = defaultTextSize;
float lo = 2;
final float threshold = 0.5f; // How close we have to be
while (hi - lo > threshold) {
float size = (hi + lo) / 2;
mTestPaint.setTextSize(size);
if(mTestPaint.measureText(text) >= targetWidth )
hi = size; // too big
else
lo = size; // too small
}
// Use lo so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, lo);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth);
this.setMeasuredDimension(parentWidth, height);
}
#Override
protected void onTextChanged(final CharSequence text, final int start,
final int before, final int after) {
refitText(text.toString(), this.getWidth());
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
if (w != oldw || h != oldh) {
refitText(this.getText().toString(), w);
}
}
}
Here is an example how it could be used in xml:
<com.your.package.activity.widget.FontFitTextView
android:id="#+id/my_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="My Text"
android:textSize="60sp" />
This would keep the font size to 60sp as long as the text fits in width. If the text is longer, it will decrease font size. In this case, the TextViews height will also change because of height=wrap_content.
If you find any bugs, feel free to edit.

Here is my solution which works on emulator and phones but not very well on Eclipse layout editor. It's inspired from kilaka's code but the size of the text is not obtained from the Paint but from measuring the TextView itself calling measure(0, 0).
The Java class :
public class FontFitTextView extends TextView
{
private static final float THRESHOLD = 0.5f;
private enum Mode { Width, Height, Both, None }
private int minTextSize = 1;
private int maxTextSize = 1000;
private Mode mode = Mode.None;
private boolean inComputation;
private int widthMeasureSpec;
private int heightMeasureSpec;
public FontFitTextView(Context context) {
super(context);
}
public FontFitTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FontFitTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray tAttrs = context.obtainStyledAttributes(attrs, R.styleable.FontFitTextView, defStyle, 0);
maxTextSize = tAttrs.getDimensionPixelSize(R.styleable.FontFitTextView_maxTextSize, maxTextSize);
minTextSize = tAttrs.getDimensionPixelSize(R.styleable.FontFitTextView_minTextSize, minTextSize);
tAttrs.recycle();
}
private void resizeText() {
if (getWidth() <= 0 || getHeight() <= 0)
return;
if(mode == Mode.None)
return;
final int targetWidth = getWidth();
final int targetHeight = getHeight();
inComputation = true;
float higherSize = maxTextSize;
float lowerSize = minTextSize;
float textSize = getTextSize();
while(higherSize - lowerSize > THRESHOLD) {
textSize = (higherSize + lowerSize) / 2;
if (isTooBig(textSize, targetWidth, targetHeight)) {
higherSize = textSize;
} else {
lowerSize = textSize;
}
}
setTextSize(TypedValue.COMPLEX_UNIT_PX, lowerSize);
measure(widthMeasureSpec, heightMeasureSpec);
inComputation = false;
}
private boolean isTooBig(float textSize, int targetWidth, int targetHeight) {
setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
measure(0, 0);
if(mode == Mode.Both)
return getMeasuredWidth() >= targetWidth || getMeasuredHeight() >= targetHeight;
if(mode == Mode.Width)
return getMeasuredWidth() >= targetWidth;
else
return getMeasuredHeight() >= targetHeight;
}
private Mode getMode(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
if(widthMode == MeasureSpec.EXACTLY && heightMode == MeasureSpec.EXACTLY)
return Mode.Both;
if(widthMode == MeasureSpec.EXACTLY)
return Mode.Width;
if(heightMode == MeasureSpec.EXACTLY)
return Mode.Height;
return Mode.None;
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if(!inComputation) {
this.widthMeasureSpec = widthMeasureSpec;
this.heightMeasureSpec = heightMeasureSpec;
mode = getMode(widthMeasureSpec, heightMeasureSpec);
resizeText();
}
}
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
resizeText();
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
if (w != oldw || h != oldh)
resizeText();
}
public int getMinTextSize() {
return minTextSize;
}
public void setMinTextSize(int minTextSize) {
this.minTextSize = minTextSize;
resizeText();
}
public int getMaxTextSize() {
return maxTextSize;
}
public void setMaxTextSize(int maxTextSize) {
this.maxTextSize = maxTextSize;
resizeText();
}
}
The XML attribute file :
<resources>
<declare-styleable name="FontFitTextView">
<attr name="minTextSize" format="dimension" />
<attr name="maxTextSize" format="dimension" />
</declare-styleable>
</resources>
Check my github for the latest version of this class.
I hope it can be useful for someone.
If a bug is found or if the code needs explaination, feel free to open an issue on Github.

Thanks a lot to https://stackoverflow.com/users/234270/speedplane. Great answer!
Here is an improved version of his response that also take care of height and comes with a maxFontSize attribute to limit font size (was useful in my case, so I wanted to share it) :
package com.<your_package>;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
public class FontFitTextView extends TextView
{
private Paint mTestPaint;
private float maxFontSize;
private static final float MAX_FONT_SIZE_DEFAULT_VALUE = 20f;
public FontFitTextView(Context context)
{
super(context);
initialise(context, null);
}
public FontFitTextView(Context context, AttributeSet attributeSet)
{
super(context, attributeSet);
initialise(context, attributeSet);
}
public FontFitTextView(Context context, AttributeSet attributeSet, int defStyle)
{
super(context, attributeSet, defStyle);
initialise(context, attributeSet);
}
private void initialise(Context context, AttributeSet attributeSet)
{
if(attributeSet!=null)
{
TypedArray styledAttributes = context.obtainStyledAttributes(attributeSet, R.styleable.FontFitTextView);
maxFontSize = styledAttributes.getDimension(R.styleable.FontFitTextView_maxFontSize, MAX_FONT_SIZE_DEFAULT_VALUE);
styledAttributes.recycle();
}
else
{
maxFontSize = MAX_FONT_SIZE_DEFAULT_VALUE;
}
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
//max size defaults to the initially specified text size unless it is too small
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth, int textHeight)
{
if (textWidth <= 0)
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
int targetHeight = textHeight - this.getPaddingTop() - this.getPaddingBottom();
float hi = maxFontSize;
float lo = 2;
// final float threshold = 0.5f; // How close we have to be
final float threshold = 1f; // How close we have to be
mTestPaint.set(this.getPaint());
Rect bounds = new Rect();
while ((hi - lo) > threshold)
{
float size = (hi + lo) / 2;
mTestPaint.setTextSize(size);
mTestPaint.getTextBounds(text, 0, text.length(), bounds);
if (bounds.width() >= targetWidth || bounds.height() >= targetHeight)
hi = size; // too big
else
lo = size; // too small
// if (mTestPaint.measureText(text) >= targetWidth)
// hi = size; // too big
// else
// lo = size; // too small
}
// Use lo so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, lo);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth, height);
this.setMeasuredDimension(parentWidth, height);
}
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after)
{
refitText(text.toString(), this.getWidth(), this.getHeight());
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
if (w != oldw)
{
refitText(this.getText().toString(), w, h);
}
}
}
Corresponding /res/values/attr.xml file:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="FontFitTextView">
<attr name="maxFontSize" format="dimension" />
</declare-styleable>
</resources>
Example:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:res-auto="http://schemas.android.com/apk/res-auto"
android:id="#+id/home_Layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/background"
tools:ignore="ContentDescription" >
...
<com.<your_package>.FontFitTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true"
android:text="Sample Text"
android:textSize="28sp"
res-auto:maxFontSize="35sp"/>
...
</RelativeLayout>
To use the new maxFontSize attribute, don't forget to add xmlns:res-auto="http://schemas.android.com/apk/res-auto" as show in the example.

You can now do this without a third party library or a widget. It's built into TextView in API level 26. Add android:autoSizeTextType="uniform" to your TextView and set height to it. That's all.
https://developer.android.com/guide/topics/ui/look-and-feel/autosizing-textview.html
<?xml version="1.0" encoding="utf-8"?>
<TextView
android:layout_width="match_parent"
android:layout_height="200dp"
android:autoSizeTextType="uniform" />
You can also use TextViewCompat or app:autoSizeTextType="uniform" for backward compatibility.

I had the same problem and wrote a class that seems to work for me. Basically, I used a static layout to draw the text in a separate canvas and remeasure until I find a font size that fits. You can see the class posted in the topic below. I hope it helps.
Auto Scale TextView Text to Fit within Bounds

Use app:autoSizeTextType="uniform" for backward compatibility because android:autoSizeTextType="uniform" only work in API Level 26 and higher.

Slight modification to onMeasure:
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
refitText(this.getText().toString(), parentWidth);
this.setMeasuredDimension(parentWidth, parentHeight);
}
And binary search on refitText:
private void refitText(String text, int textWidth)
{
if (textWidth > 0)
{
int availableWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
int trySize = (int)maxTextSize;
int increment = ~( trySize - (int)minTextSize ) / 2;
testPaint.setTextSize(trySize);
while ((trySize > minTextSize) && (testPaint.measureText(text) > availableWidth))
{
trySize += increment;
increment = ( increment == 0 ) ? -1 : ~increment / 2;
if (trySize <= minTextSize)
{
trySize = (int)minTextSize;
break;
}
testPaint.setTextSize(trySize);
}
this.setTextSize( TypedValue.COMPLEX_UNIT_PX, trySize);
}
}

I found the following to work nicely for me. It doesn't loop and accounts for both height and width. Note that it is important to specify the PX unit when calling setTextSize on the view. Thanks to the tip in a previous post for this!
Paint paint = adjustTextSize(getPaint(), numChars, maxWidth, maxHeight);
setTextSize(TypedValue.COMPLEX_UNIT_PX,paint.getTextSize());
Here is the routine I use, passing in the getPaint() from the view. A 10 character string with a 'wide' character is used to estimate the width independent from the actual string.
private static final String text10="OOOOOOOOOO";
public static Paint adjustTextSize(Paint paint, int numCharacters, int widthPixels, int heightPixels) {
float width = paint.measureText(text10)*numCharacters/text10.length();
float newSize = (int)((widthPixels/width)*paint.getTextSize());
paint.setTextSize(newSize);
// remeasure with font size near our desired result
width = paint.measureText(text10)*numCharacters/text10.length();
newSize = (int)((widthPixels/width)*paint.getTextSize());
paint.setTextSize(newSize);
// Check height constraints
FontMetricsInt metrics = paint.getFontMetricsInt();
float textHeight = metrics.descent-metrics.ascent;
if (textHeight > heightPixels) {
newSize = (int)(newSize * (heightPixels/textHeight));
paint.setTextSize(newSize);
}
return paint;
}

Works with modification
You need to set the text view size like this because otherwise setTextSize assumes the value is in SP units:
setTextSize(TypedValue.COMPLEX_UNIT_PX, trySize);
And you needed to explicitly add this code.
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
refitText(this.getText().toString(), parentWidth);
}

I had this pain in my projects for soooo long until I found this library:
compile 'me.grantland:autofittextview:0.2.+'
You just need to add the xml by your needs and it's done. For example:
<me.grantland.widget.AutofitTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true"
android:maxLines="2"
android:textSize="40sp"
autofit:minTextSize="16sp"
/>

I used a variation of Dunni solution above, but that particular code didn't work for me. In particular, when trying to use the Paint object set to have the traits of the view's Paint object, and then calling measureText(), it doesn't return the same value as directly calling the view's Paint object. Perhaps there are some differences in the way my views are set up that make the behavior different.
My solution was to directly use the view's Paint, even though there might be some performance penalties in changing the font size for the view multiple times.

I've been working on improving the excellent solution from speedplane, and came up with this. It manages the height, including setting the margin such that the text should be centered correctly vertically.
This uses the same function to get the width, as it seems to work the best, but it uses a different function to get the height, as the height isn't provided anywhere. There are some corrections that need to be made, but I figured out a way to do that, while looking pleasing to the eye.
import android.content.Context;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
public class FontFitTextView extends TextView {
public FontFitTextView(Context context) {
super(context);
initialize();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialize();
}
private void initialize() {
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
//max size defaults to the initially specified text size unless it is too small
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth,int textHeight)
{
if (textWidth <= 0)
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
int targetHeight = textHeight - this.getPaddingTop() - this.getPaddingBottom();
float hi = Math.min(targetHeight,100);
float lo = 2;
final float threshold = 0.5f; // How close we have to be
Rect bounds = new Rect();
mTestPaint.set(this.getPaint());
while((hi - lo) > threshold) {
float size = (hi+lo)/2;
mTestPaint.setTextSize(size);
mTestPaint.getTextBounds(text, 0, text.length(), bounds);
if((mTestPaint.measureText(text)) >= targetWidth || (1+(2*(size+(float)bounds.top)-bounds.bottom)) >=targetHeight)
hi = size; // too big
else
lo = size; // too small
}
// Use lo so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX,(float) lo);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth,height);
this.setMeasuredDimension(parentWidth, height);
}
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
refitText(text.toString(), this.getWidth(),this.getHeight());
}
#Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
if (w != oldw) {
refitText(this.getText().toString(), w,h);
}
}
//Attributes
private Paint mTestPaint;
}

Google already made this feature.
<TextView
android:layout_width="match_parent"
android:layout_height="200dp"
android:autoSizeTextType="uniform" />
https://developer.android.com/guide/topics/ui/look-and-feel/autosizing-textview.html

Inspired by the previous posters I wanted to share my solution. It works with a scale factor which is applied to the previous font size to make it fit the available space. In addition to prevent unexpected behaviour of TextViews onDraw method, it simply draws the text on its own.
public class FontFitTextView extends TextView {
// How much of the available space should be used in percent.
private static final float MARGINHEIGHT = 0.8f;
private static final float MARGINWIDTH = 0.8f;
private Paint paint;
private int viewWidth;
private int viewHeight;
private float textHeight;
private float textWidth;
public FontFitTextView(Context c) {
this(c, null);
}
public FontFitTextView(Context c, AttributeSet attrs) {
super(c, attrs);
initComponent();
}
// Default constructor override
public FontFitTextView(Context c, AttributeSet attrs, int defStyle) {
super(c, attrs, defStyle);
initComponent();
}
private void initComponent() {
paint = new Paint();
paint.setTextSize(30);
paint.setTextAlign(Align.CENTER);
paint.setAntiAlias(true);
}
public void setFontColor(int c) {
paint.setColor(c);
}
private void calcTextSize(String s, Canvas c) {
float availableHeight = viewHeight;
float availableWidth = viewWidth;
// This value scales the old font up or down to match the available
// space.
float scale = 1.0f;
// Rectangle for measuring the text dimensions
Rect rect = new Rect();
float oldFontSize = paint.getTextSize();
// Calculate the space used with old font size
paint.getTextBounds(s, 0, s.length(), rect);
textWidth = rect.width();
textHeight = rect.height();
// find scale-value to fit the text horizontally
float scaleWidth = 1f;
if (textWidth > 0.0f) {
scaleWidth = (availableWidth) / textWidth * MARGINWIDTH;
}
// find scale-value to fit the text vertically
float scaleHeight = 1f;
if (textHeight > 0.0f) {
scaleHeight = (availableHeight) / textHeight * MARGINHEIGHT;
}
// We are always limited by the smaller one
if (scaleWidth < scaleHeight) {
scale = scaleWidth;
} else {
scale = scaleHeight;
}
// We apply the scale to the old font size to make it bigger or smaller
float newFontSize = (oldFontSize * scale);
paint.setTextSize(newFontSize);
}
/**
* Calculates the origin on the Y-Axis (width) for the text in this view.
*
* #return
*/
private float calcStartDrawingPosX() {
float left = getMeasuredWidth();
float centerY = left - (viewWidth / 2);
return centerY;
}
/**
* Calculates the origin on the Y-Axis (height) for the text in this view.
*
* #return
*/
private float calcStartDrawingPosY() {
float bottom = getMeasuredHeight();
// The paint only centers horizontally, origin on the Y-Axis stays at
// the bottom, thus we have to lift the origin additionally by the
// height of the font.
float centerX = bottom - (viewHeight / 2) + (textHeight / 2);
return centerX;
}
#Override
protected void onDraw(Canvas canvas) {
String text = getText().toString();
if (text.length() > 0) {
calcTextSize(text, canvas);
canvas.drawText(text, calcStartDrawingPosX(),
calcStartDrawingPosY(), paint);
}
};
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
viewWidth = w;
viewHeight = h;
super.onSizeChanged(w, h, oldw, oldh);
}
}

/* get your context */
Context c = getActivity().getApplicationContext();
LinearLayout l = new LinearLayout(c);
l.setOrientation(LinearLayout.VERTICAL);
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT, 0);
l.setLayoutParams(params);
l.setBackgroundResource(R.drawable.border);
TextView tv=new TextView(c);
tv.setText(" your text here");
/* set typeface if needed */
Typeface tf = Typeface.createFromAsset(c.getAssets(),"fonts/VERDANA.TTF");
tv.setTypeface(tf);
// LayoutParams lp = new LayoutParams();
tv.setTextColor(Color.parseColor("#282828"));
tv.setGravity(Gravity.CENTER | Gravity.BOTTOM);
// tv.setLayoutParams(lp);
tv.setTextSize(20);
l.addView(tv);
return l;

This should be a simple solution:
public void correctWidth(TextView textView, int desiredWidth)
{
Paint paint = new Paint();
Rect bounds = new Rect();
paint.setTypeface(textView.getTypeface());
float textSize = textView.getTextSize();
paint.setTextSize(textSize);
String text = textView.getText().toString();
paint.getTextBounds(text, 0, text.length(), bounds);
while (bounds.width() > desiredWidth)
{
textSize--;
paint.setTextSize(textSize);
paint.getTextBounds(text, 0, text.length(), bounds);
}
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
}

Extend TextView and override onDraw with the code below. It will keep text aspect ratio but size it to fill the space. You could easily modify code to stretch if necessary.
#Override
protected void onDraw(#NonNull Canvas canvas) {
TextPaint textPaint = getPaint();
textPaint.setColor(getCurrentTextColor());
textPaint.setTextAlign(Paint.Align.CENTER);
textPaint.drawableState = getDrawableState();
String text = getText().toString();
float desiredWidth = getMeasuredWidth() - getPaddingLeft() - getPaddingRight() - 2;
float desiredHeight = getMeasuredHeight() - getPaddingTop() - getPaddingBottom() - 2;
float textSize = textPaint.getTextSize();
for (int i = 0; i < 10; i++) {
textPaint.getTextBounds(text, 0, text.length(), rect);
float width = rect.width();
float height = rect.height();
float deltaWidth = width - desiredWidth;
float deltaHeight = height - desiredHeight;
boolean fitsWidth = deltaWidth <= 0;
boolean fitsHeight = deltaHeight <= 0;
if ((fitsWidth && Math.abs(deltaHeight) < 1.0)
|| (fitsHeight && Math.abs(deltaWidth) < 1.0)) {
// close enough
break;
}
float adjustX = desiredWidth / width;
float adjustY = desiredHeight / height;
textSize = textSize * (adjustY < adjustX ? adjustY : adjustX);
// adjust text size
textPaint.setTextSize(textSize);
}
float x = desiredWidth / 2f;
float y = desiredHeight / 2f - rect.top - rect.height() / 2f;
canvas.drawText(text, x, y, textPaint);
}

I wrote a short helper class that makes a textview fit within a certain width and adds ellipsize "..." at the end if the minimum textsize cannot be achieved.
Keep in mind that it only makes the text smaller until it fits or until the minimum text size is reached. To test with large sizes, set the textsize to a large number before calling the help method.
It takes Pixels, so if you are using values from dimen, you can call it like this:
float minTextSizePx = getResources().getDimensionPixelSize(R.dimen.min_text_size);
float maxTextWidthPx = getResources().getDimensionPixelSize(R.dimen.max_text_width);
WidgetUtils.fitText(textView, text, minTextSizePx, maxTextWidthPx);
This is the class I use:
public class WidgetUtils {
public static void fitText(TextView textView, String text, float minTextSizePx, float maxWidthPx) {
textView.setEllipsize(null);
int size = (int)textView.getTextSize();
while (true) {
Rect bounds = new Rect();
Paint textPaint = textView.getPaint();
textPaint.getTextBounds(text, 0, text.length(), bounds);
if(bounds.width() < maxWidthPx){
break;
}
if (size <= minTextSizePx) {
textView.setEllipsize(TextUtils.TruncateAt.END);
break;
}
size -= 1;
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
}
}
}

If a tranformation like allCaps is set, speedplane's approach is buggy. I fixed it, resulting in the following code (sorry, my reputation does not allow me to add this as a comment to speedplane's solution):
import android.content.Context;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
public class FontFitTextView extends TextView {
public FontFitTextView(Context context) {
super(context);
initialise();
}
public FontFitTextView(Context context, AttributeSet attrs) {
super(context, attrs);
initialise();
}
private void initialise() {
mTestPaint = new Paint();
mTestPaint.set(this.getPaint());
//max size defaults to the initially specified text size unless it is too small
}
/* Re size the font so the specified text fits in the text box
* assuming the text box is the specified width.
*/
private void refitText(String text, int textWidth)
{
if (getTransformationMethod() != null) {
text = getTransformationMethod().getTransformation(text, this).toString();
}
if (textWidth <= 0)
return;
int targetWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight();
float hi = 100;
float lo = 2;
final float threshold = 0.5f; // How close we have to be
mTestPaint.set(this.getPaint());
while((hi - lo) > threshold) {
float size = (hi+lo)/2;
if(mTestPaint.measureText(text) >= targetWidth)
hi = size; // too big
else
lo = size; // too small
}
// Use lo so that we undershoot rather than overshoot
this.setTextSize(TypedValue.COMPLEX_UNIT_PX, lo);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
int height = getMeasuredHeight();
refitText(this.getText().toString(), parentWidth);
this.setMeasuredDimension(parentWidth, height);
}
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
refitText(text.toString(), this.getWidth());
}
#Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
if (w != oldw) {
refitText(this.getText().toString(), w);
}
}
//Attributes
private Paint mTestPaint;
}

I don't known this is correct way or not bt its working ...take your view and check OnGlobalLayoutListener() and get textview linecount then set textSize.
yourView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
if (textView.getLineCount()>=3) {
textView.setTextSize(20);
}else{
//add somthing
}
}
});
Its very simple few line code..

In my case using app:autoSize was not solving all cases, for example it doesn't prevent word breaking
This is what I ended up using, it will resize down the text so that there are no word breaks on multiple lines
/**
* Resizes down the text size so that there are no word breaks
*/
class AutoFitTextView #JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyleAttr: Int = 0
) : AppCompatTextView(context, attrs, defStyleAttr) {
private val paint = Paint()
private val bounds = Rect()
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec)
var shouldResize = false
paint.typeface = typeface
var textSize = textSize
paint.textSize = textSize
val biggestWord: String = text.split(" ").maxByOrNull { it.count() } ?: return
// Set bounds equal to the biggest word bounds
paint.getTextBounds(biggestWord, 0, biggestWord.length, bounds)
// Iterate to reduce the text size so that it makes the biggest word fit the line
while ((bounds.width() + paddingStart + paddingEnd + paint.fontSpacing) > measuredWidth) {
textSize--
paint.textSize = textSize
paint.getTextBounds(biggestWord, 0, biggestWord.length, bounds)
shouldResize = true
}
if (shouldResize) {
setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize)
}
}
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Scrollview with big custom view and smaller textviews - android

Related

Overlay TextureView with circle border View

Implement Chips without search functionality

While using a custom flow layout the click events are not being propagated on all devices

android full screen textview [duplicate]

How to adjust text font size to fit textview

Categories

Resources