Develop Reference

How to make a custom view inherit it's parent's style

I've created a subclass of TextView, and it is used alongside standard TextViews. The problem is that the style that is applied by default to the standard TextView isn't applied to my custom TextView. Is there a way for my custom TextView to inherit it's parent's style?
Custom view:
import android.content.Context;
import android.text.Layout.Alignment;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.widget.TextView;
/**
* Text view that auto adjusts text size to fit within the view.
* If the text size equals the minimum text size and still does not
* fit, append with an ellipsis.
*/
public class AutoResizeTextView extends TextView {
// Minimum text size for this text view
public static final float MIN_TEXT_SIZE = 20;
// Interface for resize notifications
public interface OnTextResizeListener {
void onTextResize(TextView textView, float oldSize, float newSize);
}
// Our ellipse string
private static final String mEllipsis = "...";
// Registered resize listener
private OnTextResizeListener mTextResizeListener;
// Flag for text and/or size changes to force a resize
private boolean mNeedsResize = false;
// Text size that is set from code. This acts as a starting point for resizing
private float mTextSize;
// Temporary upper bounds on the starting text size
private float mMaxTextSize = 0;
// Lower bounds for text size
private float mMinTextSize = MIN_TEXT_SIZE;
// Text view line spacing multiplier
private float mSpacingMult = 1.0f;
// Text view additional line spacing
private float mSpacingAdd = 0.0f;
// Add ellipsis to text that overflows at the smallest text size
private boolean mAddEllipsis = true;
private float mDefaultTextSize;
// Default constructor override
public AutoResizeTextView(Context context) {
this(context, null);
}
// Default constructor when inflating from XML file
public AutoResizeTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
// Default constructor override
public AutoResizeTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs);
mTextSize = getTextSize();
mDefaultTextSize = mTextSize;
}
/**
* When text changes, set the force resize flag to true and reset the text size.
*/
#Override
protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) {
mNeedsResize = true;
// Since this view may be reused, it is good to reset the text size
resetTextSize();
}
/**
* If the text view size changed, set the force resize flag to true
*/
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
if (w != oldw || h != oldh) {
mNeedsResize = true;
}
}
/**
* Register listener to receive resize notifications
* #param listener
*/
public void setOnResizeListener(OnTextResizeListener listener) {
mTextResizeListener = listener;
}
/**
* Override the set text size to update our internal reference values
*/
#Override
public void setTextSize(float size) {
super.setTextSize(size);
mTextSize = getTextSize();
}
/**
* Override the set text size to update our internal reference values
*/
#Override
public void setTextSize(int unit, float size) {
super.setTextSize(unit, size);
mTextSize = getTextSize();
}
/**
* Override the set line spacing to update our internal reference values
*/
#Override
public void setLineSpacing(float add, float mult) {
super.setLineSpacing(add, mult);
mSpacingMult = mult;
mSpacingAdd = add;
}
/**
* Set the upper text size limit and invalidate the view
* #param maxTextSize
*/
public void setMaxTextSize(float maxTextSize) {
mMaxTextSize = maxTextSize;
requestLayout();
invalidate();
}
/**
* Return upper text size limit
* #return
*/
public float getMaxTextSize() {
return mMaxTextSize;
}
/**
* Set the lower text size limit and invalidate the view
* #param minTextSize
*/
public void setMinTextSize(float minTextSize) {
mMinTextSize = minTextSize;
requestLayout();
invalidate();
}
/**
* Return lower text size limit
* #return
*/
public float getMinTextSize() {
return mMinTextSize;
}
/**
* Set flag to add ellipsis to text that overflows at the smallest text size
* #param addEllipsis
*/
public void setAddEllipsis(boolean addEllipsis) {
mAddEllipsis = addEllipsis;
}
/**
* Return flag to add ellipsis to text that overflows at the smallest text size
* #return
*/
public boolean getAddEllipsis() {
return mAddEllipsis;
}
/**
* Reset the text to the original size
*/
public void resetTextSize() {
if (mTextSize > 0) {
mTextSize = mDefaultTextSize;
super.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);
}
}
/**
* Resize text after measuring
*/
#Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
if (changed || mNeedsResize) {
int widthLimit = (right - left) - getCompoundPaddingLeft() - getCompoundPaddingRight();
int heightLimit = (bottom - top) - getCompoundPaddingBottom() - getCompoundPaddingTop();
resizeText(widthLimit, heightLimit);
}
super.onLayout(changed, left, top, right, bottom);
}
/**
* Resize the text size with default width and height
*/
public void resizeText() {
int heightLimit = getHeight() - getPaddingBottom() - getPaddingTop();
int widthLimit = getWidth() - getPaddingLeft() - getPaddingRight();
resizeText(widthLimit, heightLimit);
}
/**
* Resize the text size with specified width and height
* #param widthLimit
* #param heightLimit
*/
public void resizeText(int widthLimit, int heightLimit) {
CharSequence text = getText();
// Do not resize if the view does not have dimensions or there is no text
if (text == null || text.length() == 0 || heightLimit <= 0 || widthLimit <= 0 || mTextSize == 0) {
return;
}
if (getTransformationMethod() != null) {
text = getTransformationMethod().getTransformation(text, this);
}
// Get the text view's paint object
TextPaint textPaint = getPaint();
// Store the current text size
float currentTextSize = textPaint.getTextSize();
// If there is a max text size set, use the lesser of that and the default text size
float targetTextSize = mMaxTextSize > 0 ? Math.min(mTextSize, mMaxTextSize) : mTextSize;
// Get the required text height
int textHeight = getTextHeight(text, textPaint, widthLimit, targetTextSize);
// Until we either fit within our text view or we had reached our min text size, incrementally try smaller sizes
while (textHeight > heightLimit && targetTextSize > mMinTextSize) {
targetTextSize = Math.max(targetTextSize - 2, mMinTextSize);
textHeight = getTextHeight(text, textPaint, widthLimit, targetTextSize);
}
// If we had reached our minimum text size and still don't fit, append an ellipsis
if (mAddEllipsis && targetTextSize == mMinTextSize && textHeight > heightLimit) {
// Draw using a static layout
// modified: use a copy of TextPaint for measuring
TextPaint paint = new TextPaint(textPaint);
// Draw using a static layout
StaticLayout layout = new StaticLayout(text, paint, widthLimit, Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, false);
// Check that we have a least one line of rendered text
if (layout.getLineCount() > 0) {
// Since the line at the specific vertical position would be cut off,
// we must trim up to the previous line
int lastLine = layout.getLineForVertical(heightLimit) - 1;
// If the text would not even fit on a single line, clear it
if (lastLine < 0) {
setText("");
}
// Otherwise, trim to the previous line and add an ellipsis
else {
int start = layout.getLineStart(lastLine);
int end = layout.getLineEnd(lastLine);
float lineWidth = layout.getLineWidth(lastLine);
float ellipseWidth = textPaint.measureText(mEllipsis);
// Trim characters off until we have enough room to draw the ellipsis
while (widthLimit < lineWidth + ellipseWidth) {
lineWidth = textPaint.measureText(text.subSequence(start, --end + 1).toString());
}
setText(text.subSequence(0, end) + mEllipsis);
}
}
}
// Some devices try to auto adjust line spacing, so force default line spacing
// and invalidate the layout as a side effect
setTextSize(TypedValue.COMPLEX_UNIT_PX, targetTextSize);
setLineSpacing(mSpacingAdd, mSpacingMult);
// Notify the listener if registered
if (mTextResizeListener != null) {
mTextResizeListener.onTextResize(this, currentTextSize, targetTextSize);
}
// Reset force resize flag
mNeedsResize = false;
}
// Set the text size of the text paint object and use a static layout to render text off screen before measuring
private int getTextHeight(CharSequence source, TextPaint paint, int width, float textSize) {
// modified: make a copy of the original TextPaint object for measuring
// (apparently the object gets modified while measuring, see also the
// docs for TextView.getPaint() (which states to access it read-only)
TextPaint paintCopy = new TextPaint(paint);
// Update the text paint object
paintCopy.setTextSize(textSize);
// Measure using a static layout
StaticLayout layout = new StaticLayout(source, paintCopy, width, Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, true);
return layout.getHeight();
}
}

Toolbar colors under API 21 [duplicate]

I have the following code. I can only see the action bar color change. But, the status bar does not change.
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- App branding color for the app bar -->
<item name="colorPrimary">#009688</item>
<!-- Darker variant for the status bar and contextual app bars -->
<item name="colorPrimaryDark">#00796B</item>
<!-- Theme UI controls like checkboxes and text fields -->
<item name="colorAccent">#536DFE</item>
</style>

In API level 19, changing the status bar color is not natively supported. But the good thing is that Kitkat brought Translucent UI styling for both the status bar and navigation bar.
There is a very nice library which lets you tint the system bars with either colors or drawables you want.
How to use
Step 1
Add this to your build.grade in Android Studio.
dependencies {
compile 'com.readystatesoftware.systembartint:systembartint:1.0.3'
}
Step 2
Please set android:windowTranslucentNavigation or android:windowTranslucentStatus theme attributes to trueor set the FLAG_TRANSLUCENT_NAVIGATION or FLAG_TRANSLUCENT_STATUS flags to your Activity window in code.
Step 3
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SystemBarTintManager tintManager = new SystemBarTintManager(this);
tintManager.setStatusBarTintEnabled(true);
tintManager.setNavigationBarTintEnabled(true);
}
There are lots of customizations that you can do with this library. Just go through the library page I gave a link to or check the sample app.

Add this Code in you onCreate
SystemBarTintManager tintManager;
setTranslucentStatus(true);
tintManager = new SystemBarTintManager(this);
tintManager.setStatusBarTintEnabled(true);
tintManager.setStatusBarTintResource(R.color.YOUR_COLOR);
And create a method somewhere in same class.
private void setTranslucentStatus(boolean on) {
// TODO Auto-generated method stub
Window win = getWindow();
WindowManager.LayoutParams winParams = win.getAttributes();
final int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
if (on) {
winParams.flags |= bits;
} else {
winParams.flags &= ~bits;
}
win.setAttributes(winParams);
}
SystemBarTintManager class
import java.lang.reflect.Method;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.FrameLayout.LayoutParams;
/**
* Class to manage status and navigation bar tint effects when using KitKat
* translucent system UI modes.
*
*/
public class SystemBarTintManager {
static {
// Android allows a system property to override the presence of the navigation bar.
// Used by the emulator.
// See https://github.com/android/platform_frameworks_base/blob/master/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java#L1076
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
try {
Class c = Class.forName("android.os.SystemProperties");
Method m = c.getDeclaredMethod("get", String.class);
m.setAccessible(true);
sNavBarOverride = (String) m.invoke(null, "qemu.hw.mainkeys");
} catch (Throwable e) {
sNavBarOverride = null;
}
}
}
/**
* The default system bar tint color value.
*/
public static final int DEFAULT_TINT_COLOR = 0x99000000;
private static String sNavBarOverride;
private final SystemBarConfig mConfig;
private boolean mStatusBarAvailable;
private boolean mNavBarAvailable;
private boolean mStatusBarTintEnabled;
private boolean mNavBarTintEnabled;
private View mStatusBarTintView;
private View mNavBarTintView;
/**
* Constructor. Call this in the host activity onCreate method after its
* content view has been set. You should always create new instances when
* the host activity is recreated.
*
* #param activity The host activity.
*/
#TargetApi(19)
public SystemBarTintManager(Activity activity) {
Window win = activity.getWindow();
ViewGroup decorViewGroup = (ViewGroup) win.getDecorView();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
// check theme attrs
int[] attrs = {android.R.attr.windowTranslucentStatus,
android.R.attr.windowTranslucentNavigation};
TypedArray a = activity.obtainStyledAttributes(attrs);
try {
mStatusBarAvailable = a.getBoolean(0, false);
mNavBarAvailable = a.getBoolean(1, false);
} finally {
a.recycle();
}
// check window flags
WindowManager.LayoutParams winParams = win.getAttributes();
int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
if ((winParams.flags & bits) != 0) {
mStatusBarAvailable = true;
}
bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION;
if ((winParams.flags & bits) != 0) {
mNavBarAvailable = true;
}
}
mConfig = new SystemBarConfig(activity, mStatusBarAvailable, mNavBarAvailable);
// device might not have virtual navigation keys
if (!mConfig.hasNavigtionBar()) {
mNavBarAvailable = false;
}
if (mStatusBarAvailable) {
setupStatusBarView(activity, decorViewGroup);
}
if (mNavBarAvailable) {
setupNavBarView(activity, decorViewGroup);
}
}
/**
* Enable tinting of the system status bar.
*
* If the platform is running Jelly Bean or earlier, or translucent system
* UI modes have not been enabled in either the theme or via window flags,
* then this method does nothing.
*
* #param enabled True to enable tinting, false to disable it (default).
*/
public void setStatusBarTintEnabled(boolean enabled) {
mStatusBarTintEnabled = enabled;
if (mStatusBarAvailable) {
mStatusBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
}
}
/**
* Enable tinting of the system navigation bar.
*
* If the platform does not have soft navigation keys, is running Jelly Bean
* or earlier, or translucent system UI modes have not been enabled in either
* the theme or via window flags, then this method does nothing.
*
* #param enabled True to enable tinting, false to disable it (default).
*/
public void setNavigationBarTintEnabled(boolean enabled) {
mNavBarTintEnabled = enabled;
if (mNavBarAvailable) {
mNavBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
}
}
/**
* Apply the specified color tint to all system UI bars.
*
* #param color The color of the background tint.
*/
public void setTintColor(int color) {
setStatusBarTintColor(color);
setNavigationBarTintColor(color);
}
/**
* Apply the specified drawable or color resource to all system UI bars.
*
* #param res The identifier of the resource.
*/
public void setTintResource(int res) {
setStatusBarTintResource(res);
setNavigationBarTintResource(res);
}
/**
* Apply the specified drawable to all system UI bars.
*
* #param drawable The drawable to use as the background, or null to remove it.
*/
public void setTintDrawable(Drawable drawable) {
setStatusBarTintDrawable(drawable);
setNavigationBarTintDrawable(drawable);
}
/**
* Apply the specified alpha to all system UI bars.
*
* #param alpha The alpha to use
*/
public void setTintAlpha(float alpha) {
setStatusBarAlpha(alpha);
setNavigationBarAlpha(alpha);
}
/**
* Apply the specified color tint to the system status bar.
*
* #param color The color of the background tint.
*/
public void setStatusBarTintColor(int color) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundColor(color);
}
}
/**
* Apply the specified drawable or color resource to the system status bar.
*
* #param res The identifier of the resource.
*/
public void setStatusBarTintResource(int res) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundResource(res);
}
}
/**
* Apply the specified drawable to the system status bar.
*
* #param drawable The drawable to use as the background, or null to remove it.
*/
#SuppressWarnings("deprecation")
public void setStatusBarTintDrawable(Drawable drawable) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundDrawable(drawable);
}
}
/**
* Apply the specified alpha to the system status bar.
*
* #param alpha The alpha to use
*/
#TargetApi(11)
public void setStatusBarAlpha(float alpha) {
if (mStatusBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
mStatusBarTintView.setAlpha(alpha);
}
}
/**
* Apply the specified color tint to the system navigation bar.
*
* #param color The color of the background tint.
*/
public void setNavigationBarTintColor(int color) {
if (mNavBarAvailable) {
mNavBarTintView.setBackgroundColor(color);
}
}
/**
* Apply the specified drawable or color resource to the system navigation bar.
*
* #param res The identifier of the resource.
*/
public void setNavigationBarTintResource(int res) {
if (mNavBarAvailable) {
mNavBarTintView.setBackgroundResource(res);
}
}
/**
* Apply the specified drawable to the system navigation bar.
*
* #param drawable The drawable to use as the background, or null to remove it.
*/
#SuppressWarnings("deprecation")
public void setNavigationBarTintDrawable(Drawable drawable) {
if (mNavBarAvailable) {
mNavBarTintView.setBackgroundDrawable(drawable);
}
}
/**
* Apply the specified alpha to the system navigation bar.
*
* #param alpha The alpha to use
*/
#TargetApi(11)
public void setNavigationBarAlpha(float alpha) {
if (mNavBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
mNavBarTintView.setAlpha(alpha);
}
}
/**
* Get the system bar configuration.
*
* #return The system bar configuration for the current device configuration.
*/
public SystemBarConfig getConfig() {
return mConfig;
}
/**
* Is tinting enabled for the system status bar?
*
* #return True if enabled, False otherwise.
*/
public boolean isStatusBarTintEnabled() {
return mStatusBarTintEnabled;
}
/**
* Is tinting enabled for the system navigation bar?
*
* #return True if enabled, False otherwise.
*/
public boolean isNavBarTintEnabled() {
return mNavBarTintEnabled;
}
private void setupStatusBarView(Context context, ViewGroup decorViewGroup) {
mStatusBarTintView = new View(context);
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getStatusBarHeight());
params.gravity = Gravity.TOP;
if (mNavBarAvailable && !mConfig.isNavigationAtBottom()) {
params.rightMargin = mConfig.getNavigationBarWidth();
}
mStatusBarTintView.setLayoutParams(params);
mStatusBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
mStatusBarTintView.setVisibility(View.GONE);
decorViewGroup.addView(mStatusBarTintView);
}
private void setupNavBarView(Context context, ViewGroup decorViewGroup) {
mNavBarTintView = new View(context);
LayoutParams params;
if (mConfig.isNavigationAtBottom()) {
params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getNavigationBarHeight());
params.gravity = Gravity.BOTTOM;
} else {
params = new LayoutParams(mConfig.getNavigationBarWidth(), LayoutParams.MATCH_PARENT);
params.gravity = Gravity.RIGHT;
}
mNavBarTintView.setLayoutParams(params);
mNavBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
mNavBarTintView.setVisibility(View.GONE);
decorViewGroup.addView(mNavBarTintView);
}
/**
* Class which describes system bar sizing and other characteristics for the current
* device configuration.
*
*/
public static class SystemBarConfig {
private static final String STATUS_BAR_HEIGHT_RES_NAME = "status_bar_height";
private static final String NAV_BAR_HEIGHT_RES_NAME = "navigation_bar_height";
private static final String NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME = "navigation_bar_height_landscape";
private static final String NAV_BAR_WIDTH_RES_NAME = "navigation_bar_width";
private static final String SHOW_NAV_BAR_RES_NAME = "config_showNavigationBar";
private final boolean mTranslucentStatusBar;
private final boolean mTranslucentNavBar;
private final int mStatusBarHeight;
private final int mActionBarHeight;
private final boolean mHasNavigationBar;
private final int mNavigationBarHeight;
private final int mNavigationBarWidth;
private final boolean mInPortrait;
private final float mSmallestWidthDp;
private SystemBarConfig(Activity activity, boolean translucentStatusBar, boolean traslucentNavBar) {
Resources res = activity.getResources();
mInPortrait = (res.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT);
mSmallestWidthDp = getSmallestWidthDp(activity);
mStatusBarHeight = getInternalDimensionSize(res, STATUS_BAR_HEIGHT_RES_NAME);
mActionBarHeight = getActionBarHeight(activity);
mNavigationBarHeight = getNavigationBarHeight(activity);
mNavigationBarWidth = getNavigationBarWidth(activity);
mHasNavigationBar = (mNavigationBarHeight > 0);
mTranslucentStatusBar = translucentStatusBar;
mTranslucentNavBar = traslucentNavBar;
}
#TargetApi(14)
private int getActionBarHeight(Context context) {
int result = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
TypedValue tv = new TypedValue();
context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true);
result = context.getResources().getDimensionPixelSize(tv.resourceId);
}
return result;
}
#TargetApi(14)
private int getNavigationBarHeight(Context context) {
Resources res = context.getResources();
int result = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
if (hasNavBar(context)) {
String key;
if (mInPortrait) {
key = NAV_BAR_HEIGHT_RES_NAME;
} else {
key = NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME;
}
return getInternalDimensionSize(res, key);
}
}
return result;
}
#TargetApi(14)
private int getNavigationBarWidth(Context context) {
Resources res = context.getResources();
int result = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
if (hasNavBar(context)) {
return getInternalDimensionSize(res, NAV_BAR_WIDTH_RES_NAME);
}
}
return result;
}
#TargetApi(14)
private boolean hasNavBar(Context context) {
Resources res = context.getResources();
int resourceId = res.getIdentifier(SHOW_NAV_BAR_RES_NAME, "bool", "android");
if (resourceId != 0) {
boolean hasNav = res.getBoolean(resourceId);
// check override flag (see static block)
if ("1".equals(sNavBarOverride)) {
hasNav = false;
} else if ("0".equals(sNavBarOverride)) {
hasNav = true;
}
return hasNav;
} else { // fallback
return !ViewConfiguration.get(context).hasPermanentMenuKey();
}
}
private int getInternalDimensionSize(Resources res, String key) {
int result = 0;
int resourceId = res.getIdentifier(key, "dimen", "android");
if (resourceId > 0) {
result = res.getDimensionPixelSize(resourceId);
}
return result;
}
#SuppressLint("NewApi")
private float getSmallestWidthDp(Activity activity) {
DisplayMetrics metrics = new DisplayMetrics();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
activity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
} else {
// TODO this is not correct, but we don't really care pre-kitkat
activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
}
float widthDp = metrics.widthPixels / metrics.density;
float heightDp = metrics.heightPixels / metrics.density;
return Math.min(widthDp, heightDp);
}
/**
* Should a navigation bar appear at the bottom of the screen in the current
* device configuration? A navigation bar may appear on the right side of
* the screen in certain configurations.
*
* #return True if navigation should appear at the bottom of the screen, False otherwise.
*/
public boolean isNavigationAtBottom() {
return (mSmallestWidthDp >= 600 || mInPortrait);
}
/**
* Get the height of the system status bar.
*
* #return The height of the status bar (in pixels).
*/
public int getStatusBarHeight() {
return mStatusBarHeight;
}
/**
* Get the height of the action bar.
*
* #return The height of the action bar (in pixels).
*/
public int getActionBarHeight() {
return mActionBarHeight;
}
/**
* Does this device have a system navigation bar?
*
* #return True if this device uses soft key navigation, False otherwise.
*/
public boolean hasNavigtionBar() {
return mHasNavigationBar;
}
/**
* Get the height of the system navigation bar.
*
* #return The height of the navigation bar (in pixels). If the device does not have
* soft navigation keys, this will always return 0.
*/
public int getNavigationBarHeight() {
return mNavigationBarHeight;
}
/**
* Get the width of the system navigation bar when it is placed vertically on the screen.
*
* #return The width of the navigation bar (in pixels). If the device does not have
* soft navigation keys, this will always return 0.
*/
public int getNavigationBarWidth() {
return mNavigationBarWidth;
}
/**
* Get the layout inset for any system UI that appears at the top of the screen.
*
* #param withActionBar True to include the height of the action bar, False otherwise.
* #return The layout inset (in pixels).
*/
public int getPixelInsetTop(boolean withActionBar) {
return (mTranslucentStatusBar ? mStatusBarHeight : 0) + (withActionBar ? mActionBarHeight : 0);
}
/**
* Get the layout inset for any system UI that appears at the bottom of the screen.
*
* #return The layout inset (in pixels).
*/
public int getPixelInsetBottom() {
if (mTranslucentNavBar && isNavigationAtBottom()) {
return mNavigationBarHeight;
} else {
return 0;
}
}
/**
* Get the layout inset for any system UI that appears at the right of the screen.
*
* #return The layout inset (in pixels).
*/
public int getPixelInsetRight() {
if (mTranslucentNavBar && !isNavigationAtBottom()) {
return mNavigationBarWidth;
} else {
return 0;
}
}
}
}

How to change status bar color in android api level 19?

I have the following code. I can only see the action bar color change. But, the status bar does not change.
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- App branding color for the app bar -->
<item name="colorPrimary">#009688</item>
<!-- Darker variant for the status bar and contextual app bars -->
<item name="colorPrimaryDark">#00796B</item>
<!-- Theme UI controls like checkboxes and text fields -->
<item name="colorAccent">#536DFE</item>
</style>

In API level 19, changing the status bar color is not natively supported. But the good thing is that Kitkat brought Translucent UI styling for both the status bar and navigation bar.
There is a very nice library which lets you tint the system bars with either colors or drawables you want.
How to use
Step 1
Add this to your build.grade in Android Studio.
dependencies {
compile 'com.readystatesoftware.systembartint:systembartint:1.0.3'
}
Step 2
Please set android:windowTranslucentNavigation or android:windowTranslucentStatus theme attributes to trueor set the FLAG_TRANSLUCENT_NAVIGATION or FLAG_TRANSLUCENT_STATUS flags to your Activity window in code.
Step 3
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SystemBarTintManager tintManager = new SystemBarTintManager(this);
tintManager.setStatusBarTintEnabled(true);
tintManager.setNavigationBarTintEnabled(true);
}
There are lots of customizations that you can do with this library. Just go through the library page I gave a link to or check the sample app.

Add this Code in you onCreate
SystemBarTintManager tintManager;
setTranslucentStatus(true);
tintManager = new SystemBarTintManager(this);
tintManager.setStatusBarTintEnabled(true);
tintManager.setStatusBarTintResource(R.color.YOUR_COLOR);
And create a method somewhere in same class.
private void setTranslucentStatus(boolean on) {
// TODO Auto-generated method stub
Window win = getWindow();
WindowManager.LayoutParams winParams = win.getAttributes();
final int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
if (on) {
winParams.flags |= bits;
} else {
winParams.flags &= ~bits;
}
win.setAttributes(winParams);
}
SystemBarTintManager class
import java.lang.reflect.Method;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.FrameLayout.LayoutParams;
/**
* Class to manage status and navigation bar tint effects when using KitKat
* translucent system UI modes.
*
*/
public class SystemBarTintManager {
static {
// Android allows a system property to override the presence of the navigation bar.
// Used by the emulator.
// See https://github.com/android/platform_frameworks_base/blob/master/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java#L1076
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
try {
Class c = Class.forName("android.os.SystemProperties");
Method m = c.getDeclaredMethod("get", String.class);
m.setAccessible(true);
sNavBarOverride = (String) m.invoke(null, "qemu.hw.mainkeys");
} catch (Throwable e) {
sNavBarOverride = null;
}
}
}
/**
* The default system bar tint color value.
*/
public static final int DEFAULT_TINT_COLOR = 0x99000000;
private static String sNavBarOverride;
private final SystemBarConfig mConfig;
private boolean mStatusBarAvailable;
private boolean mNavBarAvailable;
private boolean mStatusBarTintEnabled;
private boolean mNavBarTintEnabled;
private View mStatusBarTintView;
private View mNavBarTintView;
/**
* Constructor. Call this in the host activity onCreate method after its
* content view has been set. You should always create new instances when
* the host activity is recreated.
*
* #param activity The host activity.
*/
#TargetApi(19)
public SystemBarTintManager(Activity activity) {
Window win = activity.getWindow();
ViewGroup decorViewGroup = (ViewGroup) win.getDecorView();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
// check theme attrs
int[] attrs = {android.R.attr.windowTranslucentStatus,
android.R.attr.windowTranslucentNavigation};
TypedArray a = activity.obtainStyledAttributes(attrs);
try {
mStatusBarAvailable = a.getBoolean(0, false);
mNavBarAvailable = a.getBoolean(1, false);
} finally {
a.recycle();
}
// check window flags
WindowManager.LayoutParams winParams = win.getAttributes();
int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
if ((winParams.flags & bits) != 0) {
mStatusBarAvailable = true;
}
bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION;
if ((winParams.flags & bits) != 0) {
mNavBarAvailable = true;
}
}
mConfig = new SystemBarConfig(activity, mStatusBarAvailable, mNavBarAvailable);
// device might not have virtual navigation keys
if (!mConfig.hasNavigtionBar()) {
mNavBarAvailable = false;
}
if (mStatusBarAvailable) {
setupStatusBarView(activity, decorViewGroup);
}
if (mNavBarAvailable) {
setupNavBarView(activity, decorViewGroup);
}
}
/**
* Enable tinting of the system status bar.
*
* If the platform is running Jelly Bean or earlier, or translucent system
* UI modes have not been enabled in either the theme or via window flags,
* then this method does nothing.
*
* #param enabled True to enable tinting, false to disable it (default).
*/
public void setStatusBarTintEnabled(boolean enabled) {
mStatusBarTintEnabled = enabled;
if (mStatusBarAvailable) {
mStatusBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
}
}
/**
* Enable tinting of the system navigation bar.
*
* If the platform does not have soft navigation keys, is running Jelly Bean
* or earlier, or translucent system UI modes have not been enabled in either
* the theme or via window flags, then this method does nothing.
*
* #param enabled True to enable tinting, false to disable it (default).
*/
public void setNavigationBarTintEnabled(boolean enabled) {
mNavBarTintEnabled = enabled;
if (mNavBarAvailable) {
mNavBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
}
}
/**
* Apply the specified color tint to all system UI bars.
*
* #param color The color of the background tint.
*/
public void setTintColor(int color) {
setStatusBarTintColor(color);
setNavigationBarTintColor(color);
}
/**
* Apply the specified drawable or color resource to all system UI bars.
*
* #param res The identifier of the resource.
*/
public void setTintResource(int res) {
setStatusBarTintResource(res);
setNavigationBarTintResource(res);
}
/**
* Apply the specified drawable to all system UI bars.
*
* #param drawable The drawable to use as the background, or null to remove it.
*/
public void setTintDrawable(Drawable drawable) {
setStatusBarTintDrawable(drawable);
setNavigationBarTintDrawable(drawable);
}
/**
* Apply the specified alpha to all system UI bars.
*
* #param alpha The alpha to use
*/
public void setTintAlpha(float alpha) {
setStatusBarAlpha(alpha);
setNavigationBarAlpha(alpha);
}
/**
* Apply the specified color tint to the system status bar.
*
* #param color The color of the background tint.
*/
public void setStatusBarTintColor(int color) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundColor(color);
}
}
/**
* Apply the specified drawable or color resource to the system status bar.
*
* #param res The identifier of the resource.
*/
public void setStatusBarTintResource(int res) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundResource(res);
}
}
/**
* Apply the specified drawable to the system status bar.
*
* #param drawable The drawable to use as the background, or null to remove it.
*/
#SuppressWarnings("deprecation")
public void setStatusBarTintDrawable(Drawable drawable) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundDrawable(drawable);
}
}
/**
* Apply the specified alpha to the system status bar.
*
* #param alpha The alpha to use
*/
#TargetApi(11)
public void setStatusBarAlpha(float alpha) {
if (mStatusBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
mStatusBarTintView.setAlpha(alpha);
}
}
/**
* Apply the specified color tint to the system navigation bar.
*
* #param color The color of the background tint.
*/
public void setNavigationBarTintColor(int color) {
if (mNavBarAvailable) {
mNavBarTintView.setBackgroundColor(color);
}
}
/**
* Apply the specified drawable or color resource to the system navigation bar.
*
* #param res The identifier of the resource.
*/
public void setNavigationBarTintResource(int res) {
if (mNavBarAvailable) {
mNavBarTintView.setBackgroundResource(res);
}
}
/**
* Apply the specified drawable to the system navigation bar.
*
* #param drawable The drawable to use as the background, or null to remove it.
*/
#SuppressWarnings("deprecation")
public void setNavigationBarTintDrawable(Drawable drawable) {
if (mNavBarAvailable) {
mNavBarTintView.setBackgroundDrawable(drawable);
}
}
/**
* Apply the specified alpha to the system navigation bar.
*
* #param alpha The alpha to use
*/
#TargetApi(11)
public void setNavigationBarAlpha(float alpha) {
if (mNavBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
mNavBarTintView.setAlpha(alpha);
}
}
/**
* Get the system bar configuration.
*
* #return The system bar configuration for the current device configuration.
*/
public SystemBarConfig getConfig() {
return mConfig;
}
/**
* Is tinting enabled for the system status bar?
*
* #return True if enabled, False otherwise.
*/
public boolean isStatusBarTintEnabled() {
return mStatusBarTintEnabled;
}
/**
* Is tinting enabled for the system navigation bar?
*
* #return True if enabled, False otherwise.
*/
public boolean isNavBarTintEnabled() {
return mNavBarTintEnabled;
}
private void setupStatusBarView(Context context, ViewGroup decorViewGroup) {
mStatusBarTintView = new View(context);
LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getStatusBarHeight());
params.gravity = Gravity.TOP;
if (mNavBarAvailable && !mConfig.isNavigationAtBottom()) {
params.rightMargin = mConfig.getNavigationBarWidth();
}
mStatusBarTintView.setLayoutParams(params);
mStatusBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
mStatusBarTintView.setVisibility(View.GONE);
decorViewGroup.addView(mStatusBarTintView);
}
private void setupNavBarView(Context context, ViewGroup decorViewGroup) {
mNavBarTintView = new View(context);
LayoutParams params;
if (mConfig.isNavigationAtBottom()) {
params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getNavigationBarHeight());
params.gravity = Gravity.BOTTOM;
} else {
params = new LayoutParams(mConfig.getNavigationBarWidth(), LayoutParams.MATCH_PARENT);
params.gravity = Gravity.RIGHT;
}
mNavBarTintView.setLayoutParams(params);
mNavBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
mNavBarTintView.setVisibility(View.GONE);
decorViewGroup.addView(mNavBarTintView);
}
/**
* Class which describes system bar sizing and other characteristics for the current
* device configuration.
*
*/
public static class SystemBarConfig {
private static final String STATUS_BAR_HEIGHT_RES_NAME = "status_bar_height";
private static final String NAV_BAR_HEIGHT_RES_NAME = "navigation_bar_height";
private static final String NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME = "navigation_bar_height_landscape";
private static final String NAV_BAR_WIDTH_RES_NAME = "navigation_bar_width";
private static final String SHOW_NAV_BAR_RES_NAME = "config_showNavigationBar";
private final boolean mTranslucentStatusBar;
private final boolean mTranslucentNavBar;
private final int mStatusBarHeight;
private final int mActionBarHeight;
private final boolean mHasNavigationBar;
private final int mNavigationBarHeight;
private final int mNavigationBarWidth;
private final boolean mInPortrait;
private final float mSmallestWidthDp;
private SystemBarConfig(Activity activity, boolean translucentStatusBar, boolean traslucentNavBar) {
Resources res = activity.getResources();
mInPortrait = (res.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT);
mSmallestWidthDp = getSmallestWidthDp(activity);
mStatusBarHeight = getInternalDimensionSize(res, STATUS_BAR_HEIGHT_RES_NAME);
mActionBarHeight = getActionBarHeight(activity);
mNavigationBarHeight = getNavigationBarHeight(activity);
mNavigationBarWidth = getNavigationBarWidth(activity);
mHasNavigationBar = (mNavigationBarHeight > 0);
mTranslucentStatusBar = translucentStatusBar;
mTranslucentNavBar = traslucentNavBar;
}
#TargetApi(14)
private int getActionBarHeight(Context context) {
int result = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
TypedValue tv = new TypedValue();
context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true);
result = context.getResources().getDimensionPixelSize(tv.resourceId);
}
return result;
}
#TargetApi(14)
private int getNavigationBarHeight(Context context) {
Resources res = context.getResources();
int result = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
if (hasNavBar(context)) {
String key;
if (mInPortrait) {
key = NAV_BAR_HEIGHT_RES_NAME;
} else {
key = NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME;
}
return getInternalDimensionSize(res, key);
}
}
return result;
}
#TargetApi(14)
private int getNavigationBarWidth(Context context) {
Resources res = context.getResources();
int result = 0;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
if (hasNavBar(context)) {
return getInternalDimensionSize(res, NAV_BAR_WIDTH_RES_NAME);
}
}
return result;
}
#TargetApi(14)
private boolean hasNavBar(Context context) {
Resources res = context.getResources();
int resourceId = res.getIdentifier(SHOW_NAV_BAR_RES_NAME, "bool", "android");
if (resourceId != 0) {
boolean hasNav = res.getBoolean(resourceId);
// check override flag (see static block)
if ("1".equals(sNavBarOverride)) {
hasNav = false;
} else if ("0".equals(sNavBarOverride)) {
hasNav = true;
}
return hasNav;
} else { // fallback
return !ViewConfiguration.get(context).hasPermanentMenuKey();
}
}
private int getInternalDimensionSize(Resources res, String key) {
int result = 0;
int resourceId = res.getIdentifier(key, "dimen", "android");
if (resourceId > 0) {
result = res.getDimensionPixelSize(resourceId);
}
return result;
}
#SuppressLint("NewApi")
private float getSmallestWidthDp(Activity activity) {
DisplayMetrics metrics = new DisplayMetrics();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
activity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
} else {
// TODO this is not correct, but we don't really care pre-kitkat
activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
}
float widthDp = metrics.widthPixels / metrics.density;
float heightDp = metrics.heightPixels / metrics.density;
return Math.min(widthDp, heightDp);
}
/**
* Should a navigation bar appear at the bottom of the screen in the current
* device configuration? A navigation bar may appear on the right side of
* the screen in certain configurations.
*
* #return True if navigation should appear at the bottom of the screen, False otherwise.
*/
public boolean isNavigationAtBottom() {
return (mSmallestWidthDp >= 600 || mInPortrait);
}
/**
* Get the height of the system status bar.
*
* #return The height of the status bar (in pixels).
*/
public int getStatusBarHeight() {
return mStatusBarHeight;
}
/**
* Get the height of the action bar.
*
* #return The height of the action bar (in pixels).
*/
public int getActionBarHeight() {
return mActionBarHeight;
}
/**
* Does this device have a system navigation bar?
*
* #return True if this device uses soft key navigation, False otherwise.
*/
public boolean hasNavigtionBar() {
return mHasNavigationBar;
}
/**
* Get the height of the system navigation bar.
*
* #return The height of the navigation bar (in pixels). If the device does not have
* soft navigation keys, this will always return 0.
*/
public int getNavigationBarHeight() {
return mNavigationBarHeight;
}
/**
* Get the width of the system navigation bar when it is placed vertically on the screen.
*
* #return The width of the navigation bar (in pixels). If the device does not have
* soft navigation keys, this will always return 0.
*/
public int getNavigationBarWidth() {
return mNavigationBarWidth;
}
/**
* Get the layout inset for any system UI that appears at the top of the screen.
*
* #param withActionBar True to include the height of the action bar, False otherwise.
* #return The layout inset (in pixels).
*/
public int getPixelInsetTop(boolean withActionBar) {
return (mTranslucentStatusBar ? mStatusBarHeight : 0) + (withActionBar ? mActionBarHeight : 0);
}
/**
* Get the layout inset for any system UI that appears at the bottom of the screen.
*
* #return The layout inset (in pixels).
*/
public int getPixelInsetBottom() {
if (mTranslucentNavBar && isNavigationAtBottom()) {
return mNavigationBarHeight;
} else {
return 0;
}
}
/**
* Get the layout inset for any system UI that appears at the right of the screen.
*
* #return The layout inset (in pixels).
*/
public int getPixelInsetRight() {
if (mTranslucentNavBar && !isNavigationAtBottom()) {
return mNavigationBarWidth;
} else {
return 0;
}
}
}
}

How to have a auto scrollable TextView

I am trying to have a automatic scroll in android app.
Suppose that, I have xml code like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="show me the texts"
android:id="#+id/button"/>
<ScrollView
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/text"
android:id="#+id/textView1"/>
</ScrollView>
</LinearLayout>
In this xml code I have a Button on the top of the screen and a TextView which is wrapped by a ScrollView. It means that my TextView is scrollable right now.
It works correctly, because when the user touch the screen and swap down or up, the TextView can be scrolled up and down.
But...
I intend to have a Auto Scrollable TextView and by auto I mean, I need a scrollable TextView which scrolls down about 10dp after 10 seconds.
I know I must use some thread in my application for counting the time but I don't know how to say to TextView scroll down after 10 seconds for example.
any suggestions? Any hint will be appreciated. Thanks

You can use some thing like:
mScrollView.post(new Runnable() {
public void run() {
mScrollView.smoothScrollBy(10, 10);
}
});
Documentation for smoothScrollBy :http://developer.android.com/reference/android/widget/ScrollView.html#smoothScrollBy(int,int)
To execute this task for every 10seconds:
TimerTask fileProcessTask = new TimerTask(){
#Override
public void run() {
//Scrolling here
}
};
Timer tm = new Timer();
tm.schedule(fileProcessTask, 10000L);
Also take a look at this SO Post: https://stackoverflow.com/a/14685729/3326331 , I haven't tried it but you can give it a try.

Create a new Class File and paste the code below.
In your Layout.xml give Reference to EllipsizingTextView rather than using Android TextView.
/*
* Copyright (C) 2011 Micah Hainline
* Copyright (C) 2012 Triposo
* Copyright (C) 2013 Paul Imhoff
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.text.Layout;
import android.text.Layout.Alignment;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.StaticLayout;
import android.text.TextUtils;
import android.text.TextUtils.TruncateAt;
import android.util.AttributeSet;
import android.widget.TextView;
/**
* A {#link android.widget.TextView} that ellipsizes more intelligently. This class supports ellipsizing multiline text through setting {#code android:ellipsize} and {#code android:maxLines}.
*/
public class EllipsizingTextView extends TextView {
private static final CharSequence ELLIPSIS = "\u2026";
private static final Pattern DEFAULT_END_PUNCTUATION = Pattern.compile("[\\.!?,;:\u2026]*$", Pattern.DOTALL);
private final List<EllipsizeListener> mEllipsizeListeners = new ArrayList<EllipsizeListener>();
private EllipsizeStrategy mEllipsizeStrategy;
private boolean isEllipsized;
private boolean isStale;
private boolean programmaticChange;
private CharSequence mFullText;
private int mMaxLines;
private float mLineSpacingMult = 1.0f;
private float mLineAddVertPad = 0.0f;
/**
* The end punctuation which will be removed when appending {#link #ELLIPSIS}.
*/
private Pattern mEndPunctPattern;
public EllipsizingTextView(Context context) {
this(context, null);
}
public EllipsizingTextView(Context context, AttributeSet attrs) {
this(context, attrs, android.R.attr.textViewStyle);
}
public EllipsizingTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs, new int[] { android.R.attr.maxLines, android.R.attr.ellipsize }, defStyle, 0);
setMaxLines(a.getInt(0, Integer.MAX_VALUE));
a.recycle();
setEndPunctuationPattern(DEFAULT_END_PUNCTUATION);
}
public void setEndPunctuationPattern(Pattern pattern) {
mEndPunctPattern = pattern;
}
public void addEllipsizeListener(EllipsizeListener listener) {
if (listener == null)
throw new NullPointerException();
mEllipsizeListeners.add(listener);
}
public void removeEllipsizeListener(EllipsizeListener listener) {
mEllipsizeListeners.remove(listener);
}
public boolean isEllipsized() {
return isEllipsized;
}
/**
* #return The maximum number of lines displayed in this {#link android.widget.TextView}.
*/
#SuppressLint("Override")
public int getMaxLines() {
return mMaxLines;
}
#Override
public void setMaxLines(int maxLines) {
super.setMaxLines(maxLines);
mMaxLines = maxLines;
isStale = true;
}
#Override
public boolean isFocused() {
return true;
}
/**
* Determines if the last fully visible line is being ellipsized.
*
* #return {#code true} if the last fully visible line is being ellipsized; otherwise, returns {#code false}.
*/
public boolean ellipsizingLastFullyVisibleLine() {
return mMaxLines == Integer.MAX_VALUE;
}
#Override
public void setLineSpacing(float add, float mult) {
mLineAddVertPad = add;
mLineSpacingMult = mult;
super.setLineSpacing(add, mult);
}
#Override
public void setText(CharSequence text, BufferType type) {
if (!programmaticChange) {
mFullText = text;
isStale = true;
}
super.setText(text, type);
}
#Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (ellipsizingLastFullyVisibleLine())
isStale = true;
}
#Override
public void setPadding(int left, int top, int right, int bottom) {
super.setPadding(left, top, right, bottom);
if (ellipsizingLastFullyVisibleLine())
isStale = true;
}
#Override
protected void onDraw(Canvas canvas) {
if (isStale)
resetText();
super.onDraw(canvas);
}
/**
* Sets the ellipsized text if appropriate.
*/
private void resetText() {
int maxLines = getMaxLines();
CharSequence workingText = mFullText;
boolean ellipsized = false;
if (maxLines != -1) {
if (mEllipsizeStrategy == null)
setEllipsize(null);
workingText = mEllipsizeStrategy.processText(mFullText);
ellipsized = !mEllipsizeStrategy.isInLayout(mFullText);
}
if (!workingText.equals(getText())) {
programmaticChange = true;
try {
setText(workingText);
} finally {
programmaticChange = false;
}
}
isStale = false;
if (ellipsized != isEllipsized) {
isEllipsized = ellipsized;
for (EllipsizeListener listener : mEllipsizeListeners) {
listener.ellipsizeStateChanged(ellipsized);
}
}
}
/**
* Causes words in the text that are longer than the view is wide to be ellipsized instead of broken in the middle. Use {#code null} to turn off ellipsizing.
*
* #param where
* part of text to ellipsize
*/
#Override
public void setEllipsize(TruncateAt where) {
if (where == null) {
mEllipsizeStrategy = new EllipsizeNoneStrategy();
return;
}
switch (where) {
case END:
mEllipsizeStrategy = new EllipsizeEndStrategy();
break;
case START:
mEllipsizeStrategy = new EllipsizeStartStrategy();
break;
case MIDDLE:
mEllipsizeStrategy = new EllipsizeMiddleStrategy();
break;
case MARQUEE:
super.setEllipsize(where);
isStale = false;
default:
mEllipsizeStrategy = new EllipsizeNoneStrategy();
break;
}
}
/**
* A listener that notifies when the ellipsize state has changed.
*/
public interface EllipsizeListener {
void ellipsizeStateChanged(boolean ellipsized);
}
/**
* A base class for an ellipsize strategy.
*/
private abstract class EllipsizeStrategy {
/**
* Returns ellipsized text if the text does not fit inside of the layout; otherwise, returns the full text.
*
* #param text
* text to process
* #return Ellipsized text if the text does not fit inside of the layout; otherwise, returns the full text.
*/
public CharSequence processText(CharSequence text) {
return !isInLayout(text) ? createEllipsizedText(text) : text;
}
/**
* Determines if the text fits inside of the layout.
*
* #param text
* text to fit
* #return {#code true} if the text fits inside of the layout; otherwise, returns {#code false}.
*/
public boolean isInLayout(CharSequence text) {
Layout layout = createWorkingLayout(text);
return layout.getLineCount() <= getLinesCount();
}
/**
* Creates a working layout with the given text.
*
* #param workingText
* text to create layout with
* #return {#link android.text.Layout} with the given text.
*/
protected Layout createWorkingLayout(CharSequence workingText) {
return new StaticLayout(workingText, getPaint(), getWidth() - getCompoundPaddingLeft() - getCompoundPaddingRight(), Alignment.ALIGN_NORMAL, mLineSpacingMult, mLineAddVertPad, false /* includepad */);
}
/**
* Get how many lines of text we are allowed to display.
*/
protected int getLinesCount() {
if (ellipsizingLastFullyVisibleLine()) {
int fullyVisibleLinesCount = getFullyVisibleLinesCount();
return fullyVisibleLinesCount == -1 ? 1 : fullyVisibleLinesCount;
} else {
return mMaxLines;
}
}
/**
* Get how many lines of text we can display so their full height is visible.
*/
protected int getFullyVisibleLinesCount() {
Layout layout = createWorkingLayout("");
int height = getHeight() - getCompoundPaddingTop() - getCompoundPaddingBottom();
int lineHeight = layout.getLineBottom(0);
return height / lineHeight;
}
/**
* Creates ellipsized text from the given text.
*
* #param fullText
* text to ellipsize
* #return Ellipsized text
*/
protected abstract CharSequence createEllipsizedText(CharSequence fullText);
}
/**
* An {#link EllipsizingTextView.EllipsizeStrategy} that does not ellipsize text.
*/
private class EllipsizeNoneStrategy extends EllipsizeStrategy {
#Override
protected CharSequence createEllipsizedText(CharSequence fullText) {
return fullText;
}
}
/**
* An {#link EllipsizingTextView.EllipsizeStrategy} that ellipsizes text at the end.
*/
private class EllipsizeEndStrategy extends EllipsizeStrategy {
#Override
protected CharSequence createEllipsizedText(CharSequence fullText) {
Layout layout = createWorkingLayout(fullText);
int cutOffIndex = layout.getLineEnd(mMaxLines - 1);
int textLength = fullText.length();
int cutOffLength = textLength - cutOffIndex;
if (cutOffLength < ELLIPSIS.length())
cutOffLength = ELLIPSIS.length();
String workingText = TextUtils.substring(fullText, 0, textLength - cutOffLength).trim();
String strippedText = stripEndPunctuation(workingText);
while (!isInLayout(strippedText + ELLIPSIS)) {
int lastSpace = workingText.lastIndexOf(' ');
if (lastSpace == -1)
break;
workingText = workingText.substring(0, lastSpace).trim();
strippedText = stripEndPunctuation(workingText);
}
workingText = strippedText + ELLIPSIS;
SpannableStringBuilder dest = new SpannableStringBuilder(workingText);
if (fullText instanceof Spanned) {
TextUtils.copySpansFrom((Spanned) fullText, 0, workingText.length(), null, dest, 0);
}
return dest;
}
/**
* Strips the end punctuation from a given text according to {#link #mEndPunctPattern}.
*
* #param workingText
* text to strip end punctuation from
* #return Text without end punctuation.
*/
public String stripEndPunctuation(CharSequence workingText) {
return mEndPunctPattern.matcher(workingText).replaceFirst("");
}
}
/**
* An {#link EllipsizingTextView.EllipsizeStrategy} that ellipsizes text at the start.
*/
private class EllipsizeStartStrategy extends EllipsizeStrategy {
#Override
protected CharSequence createEllipsizedText(CharSequence fullText) {
Layout layout = createWorkingLayout(fullText);
int cutOffIndex = layout.getLineEnd(mMaxLines - 1);
int textLength = fullText.length();
int cutOffLength = textLength - cutOffIndex;
if (cutOffLength < ELLIPSIS.length())
cutOffLength = ELLIPSIS.length();
String workingText = TextUtils.substring(fullText, cutOffLength, textLength).trim();
while (!isInLayout(ELLIPSIS + workingText)) {
int firstSpace = workingText.indexOf(' ');
if (firstSpace == -1)
break;
workingText = workingText.substring(firstSpace, workingText.length()).trim();
}
workingText = ELLIPSIS + workingText;
SpannableStringBuilder dest = new SpannableStringBuilder(workingText);
if (fullText instanceof Spanned) {
TextUtils.copySpansFrom((Spanned) fullText, textLength - workingText.length(), textLength, null, dest, 0);
}
return dest;
}
}
/**
* An {#link EllipsizingTextView.EllipsizeStrategy} that ellipsizes text in the middle.
*/
private class EllipsizeMiddleStrategy extends EllipsizeStrategy {
#Override
protected CharSequence createEllipsizedText(CharSequence fullText) {
Layout layout = createWorkingLayout(fullText);
int cutOffIndex = layout.getLineEnd(mMaxLines - 1);
int textLength = fullText.length();
int cutOffLength = textLength - cutOffIndex;
if (cutOffLength < ELLIPSIS.length())
cutOffLength = ELLIPSIS.length();
cutOffLength += cutOffIndex % 2; // Make it even.
String firstPart = TextUtils.substring(fullText, 0, textLength / 2 - cutOffLength / 2).trim();
String secondPart = TextUtils.substring(fullText, textLength / 2 + cutOffLength / 2, textLength).trim();
while (!isInLayout(firstPart + ELLIPSIS + secondPart)) {
int lastSpaceFirstPart = firstPart.lastIndexOf(' ');
int firstSpaceSecondPart = secondPart.indexOf(' ');
if (lastSpaceFirstPart == -1 || firstSpaceSecondPart == -1)
break;
firstPart = firstPart.substring(0, lastSpaceFirstPart).trim();
secondPart = secondPart.substring(firstSpaceSecondPart, secondPart.length()).trim();
}
SpannableStringBuilder firstDest = new SpannableStringBuilder(firstPart);
SpannableStringBuilder secondDest = new SpannableStringBuilder(secondPart);
if (fullText instanceof Spanned) {
TextUtils.copySpansFrom((Spanned) fullText, 0, firstPart.length(), null, firstDest, 0);
TextUtils.copySpansFrom((Spanned) fullText, textLength - secondPart.length(), textLength, null, secondDest, 0);
}
return TextUtils.concat(firstDest, ELLIPSIS, secondDest);
}
}
}

How to display dynamic text on a button and auto adjust their size in Android?

I'm working on a project which needs me to display some dynamic texts based on users' selection on a button.
I know how to do the text display part, but I was stuck on how I can display different text properly on a fixed size button.
For example: "Apple" and "I have an Apple". How can I achieve the result that when displaying "Apple", the text size will be bigger and fit the button, and when "I have an Apple" the text will be smaller and may become three lines?
Thank you!

Android 8.0 supports Autosizing TextViews so you just have to specify android:autoSizeTextType="uniform". For older versions, you can use android.support.v7.widget.AppCompatTextView with app:autoSizeTextType="uniform".
By chance, it also works for buttons and for older versions just use android.support.v7.widget.AppCompatButton instead.
Hope this helped.

Take a look at this question Auto Scale TextView Text to Fit within Bounds. The same technique should apply to a button.
(yes, it is much more complicated than it seems like it should be.)

Style.xml:
<style name="Widget.Button.CustomStyle" parent="Widget.MaterialComponents.Button">
<item name="android:minHeight">50dp</item>
<item name="android:maxWidth">300dp</item>
<item name="android:textStyle">bold</item>
<item name="android:textSize">16sp</item>
<item name="backgroundTint">#color/white</item>
<item name="cornerRadius">25dp</item>
<item name="autoSizeTextType">uniform</item>
<item name="autoSizeMinTextSize">10sp</item>
<item name="autoSizeMaxTextSize">16sp</item>
<item name="autoSizeStepGranularity">2sp</item>
<item name="android:maxLines">1</item>
<item name="android:textColor">#color/colorPrimary</item>
<item name="android:insetTop">0dp</item>
<item name="android:insetBottom">0dp</item>
<item name="android:lineSpacingExtra">4sp</item>
<item name="android:gravity">center</item>
</style>
Usage:
<com.google.android.material.button.MaterialButton
android:id="#+id/blah"
style="#style/Widget.Button.CustomStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:text="Your long text, to the infinity and beyond!!! Why not :)" />
Result:
[Source: https://stackoverflow.com/a/59302886/421467 ]

I know this question is a few years old, but I want to add a full solution for future reference.
This code is based on AutoFitTextView and has been adapted for Buttons. Specifically it also considers the text width to avoid word-breaks when resizing.
For all licensing information visit the above link.
You'll need at least to java files:
AutoSizeTextButton.java
public class AutoSizeTextButton extends android.support.v7.widget.AppCompatButton implements AutofitHelper.OnTextSizeChangeListener{
private AutofitHelper mHelper;
public AutoSizeTextButton(Context context) {
this(context, null, 0);
}
public AutoSizeTextButton(Context context, AttributeSet attrs) {
super(context, attrs, 0);
}
public AutoSizeTextButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(attrs, defStyleAttr);
}
private void init(AttributeSet attrs, int defStyleAttr) {
mHelper = AutofitHelper.create(this, attrs, defStyleAttr)
.addOnTextSizeChangeListener(this);
}
// Getters and Setters
/**
* {#inheritDoc}
*/
#Override
public void setTextSize(int unit, float size) {
super.setTextSize(unit, size);
if (mHelper != null) {
mHelper.setTextSize(unit, size);
}
}
/**
* {#inheritDoc}
*/
#Override
public void setLines(int lines) {
super.setLines(lines);
if (mHelper != null) {
mHelper.setMaxLines(lines);
}
}
/**
* {#inheritDoc}
*/
#Override
public void setMaxLines(int maxLines) {
super.setMaxLines(maxLines);
if (mHelper != null) {
mHelper.setMaxLines(maxLines);
}
}
/**
* Returns the {#link AutofitHelper} for this View.
*/
public AutofitHelper getAutofitHelper() {
return mHelper;
}
/**
* Returns whether or not the text will be automatically re-sized to fit its constraints.
*/
public boolean isSizeToFit() {
return mHelper.isEnabled();
}
/**
* Sets the property of this field (sizeToFit), to automatically resize the text to fit its
* constraints.
*/
public void setSizeToFit() {
setSizeToFit(true);
}
/**
* If true, the text will automatically be re-sized to fit its constraints; if false, it will
* act like a normal View.
*
* #param sizeToFit
*/
public void setSizeToFit(boolean sizeToFit) {
mHelper.setEnabled(sizeToFit);
}
/**
* Returns the maximum size (in pixels) of the text in this View.
*/
public float getMaxTextSize() {
return mHelper.getMaxTextSize();
}
/**
* Set the maximum text size to the given value, interpreted as "scaled pixel" units. This size
* is adjusted based on the current density and user font size preference.
*
* #param size The scaled pixel size.
*
* #attr ref android.R.styleable#TextView_textSize
*/
public void setMaxTextSize(float size) {
mHelper.setMaxTextSize(size);
}
/**
* Set the maximum text size to a given unit and value. See TypedValue for the possible
* dimension units.
*
* #param unit The desired dimension unit.
* #param size The desired size in the given units.
*
* #attr ref android.R.styleable#TextView_textSize
*/
public void setMaxTextSize(int unit, float size) {
mHelper.setMaxTextSize(unit, size);
}
/**
* Returns the minimum size (in pixels) of the text in this View.
*/
public float getMinTextSize() {
return mHelper.getMinTextSize();
}
/**
* Set the minimum text size to the given value, interpreted as "scaled pixel" units. This size
* is adjusted based on the current density and user font size preference.
*
* #param minSize The scaled pixel size.
*
* #attr ref R.styleable#AutofitButton_minTextSize
*/
public void setMinTextSize(int minSize) {
mHelper.setMinTextSize(TypedValue.COMPLEX_UNIT_SP, minSize);
}
/**
* Set the minimum text size to a given unit and value. See TypedValue for the possible
* dimension units.
*
* #param unit The desired dimension unit.
* #param minSize The desired size in the given units.
*
* #attr ref R.styleable#AutofitButton_minTextSize
*/
public void setMinTextSize(int unit, float minSize) {
mHelper.setMinTextSize(unit, minSize);
}
/**
* Returns the amount of precision used to calculate the correct text size to fit within its
* bounds.
*/
public float getPrecision() {
return mHelper.getPrecision();
}
/**
* Set the amount of precision used to calculate the correct text size to fit within its
* bounds. Lower precision is more precise and takes more time.
*
* #param precision The amount of precision.
*/
public void setPrecision(float precision) {
mHelper.setPrecision(precision);
}
#Override
public void onTextSizeChange(float textSize, float oldTextSize) {
// do nothing
}
}
AutofitHelper.java
/**
* A helper class to enable automatically resizing a {#link android.widget.Button}`s {#code textSize} to fit
* within its bounds.
*
* #attr ref R.styleable.AutofitButton_sizeToFit
* #attr ref R.styleable.AutofitButton_minTextSize
* #attr ref R.styleable.AutofitButton_precision
*/
public class AutofitHelper {
private static final String TAG = "AutoFitTextHelper";
private static final boolean SPEW = false;
// Minimum size of the text in pixels
private static final int DEFAULT_MIN_TEXT_SIZE = 8; //sp
// How precise we want to be when reaching the target textWidth size
private static final float DEFAULT_PRECISION = 0.5f;
/**
* Creates a new instance of {#code AutofitHelper} that wraps a {#link android.widget.Button} and enables
* automatically sizing the text to fit.
*/
public static AutofitHelper create(Button view) {
return create(view, null, 0);
}
/**
* Creates a new instance of {#code AutofitHelper} that wraps a {#link android.widget.Button} and enables
* automatically sizing the text to fit.
*/
public static AutofitHelper create(Button view, AttributeSet attrs) {
return create(view, attrs, 0);
}
/**
* Creates a new instance of {#code AutofitHelper} that wraps a {#link android.widget.Button} and enables
* automatically sizing the text to fit.
*/
public static AutofitHelper create(Button view, AttributeSet attrs, int defStyle) {
AutofitHelper helper = new AutofitHelper(view);
boolean sizeToFit = true;
if (attrs != null) {
Context context = view.getContext();
int minTextSize = (int) helper.getMinTextSize();
float precision = helper.getPrecision();
TypedArray ta = context.obtainStyledAttributes(
attrs,
R.styleable.AutofitButton,
defStyle,
0);
sizeToFit = ta.getBoolean(R.styleable.AutofitButton_sizeToFit, sizeToFit);
minTextSize = ta.getDimensionPixelSize(R.styleable.AutofitButton_minTextSize,
minTextSize);
precision = ta.getFloat(R.styleable.AutofitButton_precision, precision);
ta.recycle();
helper.setMinTextSize(TypedValue.COMPLEX_UNIT_PX, minTextSize)
.setPrecision(precision);
}
helper.setEnabled(sizeToFit);
return helper;
}
/**
* Re-sizes the textSize of the TextView so that the text fits within the bounds of the View.
*/
private static void autofit(Button view, TextPaint paint, float minTextSize, float maxTextSize,
int maxLines, float precision) {
if (maxLines <= 0 || maxLines == Integer.MAX_VALUE) {
// Don't auto-size since there's no limit on lines.
return;
}
int targetWidth = view.getWidth() - view.getPaddingLeft() - view.getPaddingRight();
if (targetWidth <= 0) {
return;
}
CharSequence text = view.getText();
TransformationMethod method = view.getTransformationMethod();
if (method != null) {
text = method.getTransformation(text, view);
}
Context context = view.getContext();
Resources r = Resources.getSystem();
DisplayMetrics displayMetrics;
float size = maxTextSize;
float high = size;
float low = 0;
if (context != null) {
r = context.getResources();
}
displayMetrics = r.getDisplayMetrics();
paint.set(view.getPaint());
paint.setTextSize(size);
if ((maxLines == 1 && paint.measureText(text, 0, text.length()) > targetWidth)
|| getLineCount(text, paint, size, targetWidth, displayMetrics) > maxLines
|| getMaxWordWidth(text, paint, size, displayMetrics) > targetWidth) {
size = getAutofitTextSize(text, getMaxWord(text, paint), paint, targetWidth, maxLines, low, high, precision,
displayMetrics);
}
if (size < minTextSize) {
size = minTextSize;
}
view.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
}
/**
* Recursive binary search to find the best size for the text.
*/
private static float getAutofitTextSize(CharSequence text, String widestWord, TextPaint paint,
float targetWidth, int maxLines, float low, float high, float precision,
DisplayMetrics displayMetrics) {
float mid = (low + high) / 2.0f;
int lineCount = 1;
StaticLayout layout = null;
paint.setTextSize(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, mid,
displayMetrics));
if (maxLines != 1) {
layout = new StaticLayout(text, paint, (int)targetWidth, Layout.Alignment.ALIGN_NORMAL,
1.0f, 0.0f, true);
lineCount = layout.getLineCount();
}
if (SPEW) Log.d(TAG, "low=" + low + " high=" + high + " mid=" + mid +
" target=" + targetWidth + " maxLines=" + maxLines + " lineCount=" + lineCount);
if (lineCount > maxLines) {
// For the case that `text` has more newline characters than `maxLines`.
if ((high - low) < precision) {
return low;
}
return getAutofitTextSize(text, widestWord, paint, targetWidth, maxLines, low, mid, precision,
displayMetrics);
}
else if (lineCount < maxLines) {
return getAutofitTextSize(text, widestWord, paint, targetWidth, maxLines, mid, high, precision,
displayMetrics);
}
else {
float maxLineWidth = 0;
if (maxLines == 1) {
maxLineWidth = paint.measureText(text, 0, text.length());
} else {
for (int i = 0; i < lineCount; i++) {
if (layout.getLineWidth(i) > maxLineWidth) {
maxLineWidth = layout.getLineWidth(i);
}
}
}
float maxWordWidth = paint.measureText(widestWord, 0, widestWord.length());
if(maxWordWidth > maxLineWidth){
maxLineWidth = maxWordWidth;
}
if ((high - low) < precision) {
return low;
} else if (maxLineWidth > targetWidth) {
return getAutofitTextSize(text, widestWord, paint, targetWidth, maxLines, low, mid, precision,
displayMetrics);
} else if (maxLineWidth < targetWidth) {
return getAutofitTextSize(text, widestWord, paint, targetWidth, maxLines, mid, high, precision,
displayMetrics);
} else {
return mid;
}
}
}
private static int getLineCount(CharSequence text, TextPaint paint, float size, float width,
DisplayMetrics displayMetrics) {
paint.setTextSize(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, size,
displayMetrics));
StaticLayout layout = new StaticLayout(text, paint, (int)width,
Layout.Alignment.ALIGN_NORMAL, 1.0f, 0.0f, true);
return layout.getLineCount();
}
private static int getMaxLines(Button view) {
int maxLines = -1; // No limit (Integer.MAX_VALUE also means no limit)
TransformationMethod method = view.getTransformationMethod();
if (method != null && method instanceof SingleLineTransformationMethod) {
maxLines = 1;
}
else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
// setMaxLines() and getMaxLines() are only available on android-16+
maxLines = view.getMaxLines();
}
return maxLines;
}
private static float getMaxWordWidth(CharSequence text, TextPaint paint, float size,
DisplayMetrics displayMetrics) {
paint.setTextSize(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, size,
displayMetrics));
String maxWord = getMaxWord(text, paint);
return paint.measureText(maxWord, 0, maxWord.length());
}
private static String getMaxWord(CharSequence text, TextPaint paint) {
String textStr = text.toString();
textStr = textStr.replace("-", "- ");
String[] words = textStr.split("[ \u00AD\u200B]");
String maxWord = "";
float maxWordWidth = 0;
for (String word : words) {
float wordWidth = paint.measureText(word, 0, word.length());
if (wordWidth > maxWordWidth){
maxWordWidth = wordWidth;
maxWord = word;
}
}
return maxWord;
}
// Attributes
private Button mButton;
private TextPaint mPaint;
/**
* Original textSize of the TextView.
*/
private float mTextSize;
private int mMaxLines;
private float mMinTextSize;
private float mMaxTextSize;
private float mPrecision;
private boolean mEnabled;
private boolean mIsAutofitting;
private ArrayList<OnTextSizeChangeListener> mListeners;
private TextWatcher mTextWatcher = new AutofitTextWatcher();
private View.OnLayoutChangeListener mOnLayoutChangeListener =
new AutofitOnLayoutChangeListener();
private AutofitHelper(Button view) {
final Context context = view.getContext();
float scaledDensity = context.getResources().getDisplayMetrics().scaledDensity;
mButton = view;
mPaint = new TextPaint();
setRawTextSize(view.getTextSize());
mMaxLines = getMaxLines(view);
mMinTextSize = scaledDensity * DEFAULT_MIN_TEXT_SIZE;
mMaxTextSize = mTextSize;
mPrecision = DEFAULT_PRECISION;
}
/**
* Adds an {#link OnTextSizeChangeListener} to the list of those whose methods are called
* whenever the {#link android.widget.Button}'s {#code textSize} changes.
*/
public AutofitHelper addOnTextSizeChangeListener(OnTextSizeChangeListener listener) {
if (mListeners == null) {
mListeners = new ArrayList<OnTextSizeChangeListener>();
}
mListeners.add(listener);
return this;
}
/**
* Removes the specified {#link OnTextSizeChangeListener} from the list of those whose methods
* are called whenever the {#link android.widget.Button}'s {#code textSize} changes.
*/
public AutofitHelper removeOnTextSizeChangeListener(OnTextSizeChangeListener listener) {
if (mListeners != null) {
mListeners.remove(listener);
}
return this;
}
/**
* Returns the amount of precision used to calculate the correct text size to fit within its
* bounds.
*/
public float getPrecision() {
return mPrecision;
}
/**
* Set the amount of precision used to calculate the correct text size to fit within its
* bounds. Lower precision is more precise and takes more time.
*
* #param precision The amount of precision.
*/
public AutofitHelper setPrecision(float precision) {
if (mPrecision != precision) {
mPrecision = precision;
autofit();
}
return this;
}
/**
* Returns the minimum size (in pixels) of the text.
*/
public float getMinTextSize() {
return mMinTextSize;
}
/**
* Set the minimum text size to the given value, interpreted as "scaled pixel" units. This size
* is adjusted based on the current density and user font size preference.
*
* #param size The scaled pixel size.
*
* #attr ref me.grantland.R.styleable#AutofitTextView_minTextSize
*/
public AutofitHelper setMinTextSize(float size) {
return setMinTextSize(TypedValue.COMPLEX_UNIT_SP, size);
}
/**
* Set the minimum text size to a given unit and value. See TypedValue for the possible
* dimension units.
*
* #param unit The desired dimension unit.
* #param size The desired size in the given units.
*
* #attr ref me.grantland.R.styleable#AutofitTextView_minTextSize
*/
public AutofitHelper setMinTextSize(int unit, float size) {
Context context = mButton.getContext();
Resources r = Resources.getSystem();
if (context != null) {
r = context.getResources();
}
setRawMinTextSize(TypedValue.applyDimension(unit, size, r.getDisplayMetrics()));
return this;
}
private void setRawMinTextSize(float size) {
if (size != mMinTextSize) {
mMinTextSize = size;
autofit();
}
}
/**
* Returns the maximum size (in pixels) of the text.
*/
public float getMaxTextSize() {
return mMaxTextSize;
}
/**
* Set the maximum text size to the given value, interpreted as "scaled pixel" units. This size
* is adjusted based on the current density and user font size preference.
*
* #param size The scaled pixel size.
*
* #attr ref android.R.styleable#TextView_textSize
*/
public AutofitHelper setMaxTextSize(float size) {
return setMaxTextSize(TypedValue.COMPLEX_UNIT_SP, size);
}
/**
* Set the maximum text size to a given unit and value. See TypedValue for the possible
* dimension units.
*
* #param unit The desired dimension unit.
* #param size The desired size in the given units.
*
* #attr ref android.R.styleable#TextView_textSize
*/
public AutofitHelper setMaxTextSize(int unit, float size) {
Context context = mButton.getContext();
Resources r = Resources.getSystem();
if (context != null) {
r = context.getResources();
}
setRawMaxTextSize(TypedValue.applyDimension(unit, size, r.getDisplayMetrics()));
return this;
}
private void setRawMaxTextSize(float size) {
if (size != mMaxTextSize) {
mMaxTextSize = size;
autofit();
}
}
/**
* #see TextView#getMaxLines()
*/
public int getMaxLines() {
return mMaxLines;
}
/**
* #see TextView#setMaxLines(int)
*/
public AutofitHelper setMaxLines(int lines) {
if (mMaxLines != lines) {
mMaxLines = lines;
autofit();
}
return this;
}
/**
* Returns whether or not automatically resizing text is enabled.
*/
public boolean isEnabled() {
return mEnabled;
}
/**
* Set the enabled state of automatically resizing text.
*/
public AutofitHelper setEnabled(boolean enabled) {
if (mEnabled != enabled) {
mEnabled = enabled;
if (enabled) {
mButton.addTextChangedListener(mTextWatcher);
mButton.addOnLayoutChangeListener(mOnLayoutChangeListener);
autofit();
} else {
mButton.removeTextChangedListener(mTextWatcher);
mButton.removeOnLayoutChangeListener(mOnLayoutChangeListener);
mButton.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTextSize);
}
}
return this;
}
/**
* Returns the original text size of the View.
*
* #see TextView#getTextSize()
*/
public float getTextSize() {
return mTextSize;
}
/**
* Set the original text size of the View.
*
* #see TextView#setTextSize(float)
*/
public void setTextSize(float size) {
setTextSize(TypedValue.COMPLEX_UNIT_SP, size);
}
/**
* Set the original text size of the View.
*
* #see TextView#setTextSize(int, float)
*/
public void setTextSize(int unit, float size) {
if (mIsAutofitting) {
// We don't want to update the TextView's actual textSize while we're autofitting
// since it'd get set to the autofitTextSize
return;
}
Context context = mButton.getContext();
Resources r = Resources.getSystem();
if (context != null) {
r = context.getResources();
}
setRawTextSize(TypedValue.applyDimension(unit, size, r.getDisplayMetrics()));
}
private void setRawTextSize(float size) {
if (mTextSize != size) {
mTextSize = size;
}
}
private void autofit() {
float oldTextSize = mButton.getTextSize();
float textSize;
mIsAutofitting = true;
autofit(mButton, mPaint, mMinTextSize, mMaxTextSize, mMaxLines, mPrecision);
mIsAutofitting = false;
textSize = mButton.getTextSize();
if (textSize != oldTextSize) {
sendTextSizeChange(textSize, oldTextSize);
}
}
private void sendTextSizeChange(float textSize, float oldTextSize) {
if (mListeners == null) {
return;
}
for (OnTextSizeChangeListener listener : mListeners) {
listener.onTextSizeChange(textSize, oldTextSize);
}
}
private class AutofitTextWatcher implements TextWatcher {
#Override
public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
// do nothing
}
#Override
public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
autofit();
}
#Override
public void afterTextChanged(Editable editable) {
// do nothing
}
}
private class AutofitOnLayoutChangeListener implements View.OnLayoutChangeListener {
#Override
public void onLayoutChange(View view, int left, int top, int right, int bottom,
int oldLeft, int oldTop, int oldRight, int oldBottom) {
autofit();
}
}
/**
* When an object of a type is attached to an {#code AutofitHelper}, its methods will be called
* when the {#code textSize} is changed.
*/
public interface OnTextSizeChangeListener {
/**
* This method is called to notify you that the size of the text has changed to
* {#code textSize} from {#code oldTextSize}.
*/
public void onTextSizeChange(float textSize, float oldTextSize);
}
}
Then add the needed attributes in
values/attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="AutofitButton">
<!-- Minimum size of the text. -->
<attr name="minTextSize" format="dimension" />
<!-- Amount of precision used to calculate the correct text size to fit within its
bounds. Lower precision is more precise and takes more time. -->
<attr name="precision" format="float" />
<!-- Defines whether to automatically resize text to fit to the view's bounds. -->
<attr name="sizeToFit" format="boolean" />
</declare-styleable>
<!-- Your other attributes -->
</resources>
And you're done! You can now use the AutoSizeTextButton class.
<your.package.name.AutoSizeTextButton
android:layout_width="..."
android:layout_height="..."
android:maxLines="2" />
And be sure to add the android:maxLines attribute with a value larger than 0, otherwise it won't do anything!
Additional Notes:
The text is shrunken until the longest word fits into the button without wrapping (or the minimum size is reached). The words have to be seperated by either a normal space, or a hyphen. This algorithm also considers a SOFT HYPHEN or a ZERO WIDTH SPACE a word seperator, however I would strongly advise to test them before using them, because the Android Text Engine used in buttons ignores these characters (at least in API 19), which could lead to weird word-wraps.

It's better you use this library named AutoScaleTextView
https://bitbucket.org/ankri/autoscaletextview
This will definitely help you to achieve your desired task.

There is no built-in way of doing this, you will need to create/use a custom view that adapts the inner text to its bounds. Don't worry, this is not the first time its been asked, see the Custom View provided at Auto Scale TextView Text to Fit within Bounds to get the working code.

if any one is looking on how to disable auto text size, it can be done by
<TextView
app:autoSizeTextType="none" <!-- disabled -->
adding the above line to your text view