Related
I have a custom line view between a center button and 12 outer buttons, see pic.
Code block 1 is what I use to get the center points of each button combination.
Code block 2 is my 'custom drawing' , which draws the line between each set of center points, 12 lines in total.
The 12 custom lines are all inside an xml file.
The buttons and lines are passed into Public Class Drawline as in two separate arrays.
I've also created a class that uses Path to draw a triangle. this is sitting in the upper left hand corner of my graphic.
What I want.
A line between the centers of the buttons that stops short of the second end point.
I want the line between the points to end as you see between the buttons 'crispy crunchy' and 'balance'. I need help finding how to 'get' the x,y of this point. I also what to put the arrowhead on the end of the line.
public class Drawline {
public void drawLines(List<LineView> mlinesToDraw,ArrayList<Button> buttonsbalance, Context
context,Button btnbase) {
float centerXOnImage1;
double centerYOnImage1;
float centerXOfImageOnScreen1;
double centerYOfImageOnScreen1;
float centerXOnImage2;
float centerYOnImage2;
float centerXOfImageOnScreen2;
float centerYOfImageOnScreen2;
List<LineView> mLine = mlinesToDraw;
ArrayList<Button> btns = buttonsbalance;
PointF pointA;
PointF pointB;
for (int i = 0; i < mLine.size(); i++) {
Button button1 = btns.get(i + 1); //skip btnx0/btnbase
centerXOnImage1 = button1.getWidth() / 2;
centerYOnImage1 = (button1.getHeight()) / 2;//-actionBarHeight)/2;
centerXOfImageOnScreen1 = button1.getLeft()+ centerXOnImage1;
centerYOfImageOnScreen1 = button1.getTop() + (centerYOnImage1);
Button button2 = btnbase;
centerXOnImage2 = button2.getWidth() / 2;
centerYOnImage2 = (button2.getHeight()) / 2;//-actionBarHeight)/2;
centerXOfImageOnScreen2 = button2.getLeft() + centerXOnImage2;
centerYOfImageOnScreen2 = button2.getTop() + (centerYOnImage2);
pointA = new PointF(centerXOfImageOnScreen1, (float) centerYOfImageOnScreen1);
pointB = new PointF(centerXOfImageOnScreen2, (float) centerYOfImageOnScreen2);
mLine.get(i).setPointA(pointA);
mLine.get(i).setPointB(pointB);
mLine.get(i).draw();
}
}
Custom drawing class.
public class LineView extends View {
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
private PointF pointA,pointB;
// private void init() {
// paint.setColor(Color.BLACK);
// }
public LineView(Context context) {
super(context);
// init();
}
public LineView(Context context, AttributeSet attrs) {
super(context, attrs);
// init();
}
public LineView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// init();
}
#SuppressLint("ResourceAsColor")
public void onDraw(Canvas canvas) {
super.onDraw(canvas);
int color = R.color.GradientStart;
paint.setColor(color);
paint.setAntiAlias(true);
paint.setStrokeWidth(6);
canvas.drawLine(pointA.x, pointA.y, pointB.x, pointB.y, paint);
}
public void setPointA(PointF point){
pointA=point;}
public void setPointB(PointF point){
pointB=point;}
public void draw(){
invalidate();
requestLayout();
}}
I feel like there should be an easier way to do this but I've not found it yet.
I appreciate any help.
thanks,
Jim
Because I now the angle of each outer button and the radius to the point, I was able to get the location using polar coordinates. I then used the following conversion to get the corresponding x and y coordinates.
val x = radius * Math.cos(angle);
val y = radius * Math.sin(angle);
This gave me the alternate endpoint I needed to draw the line.
I created a custom TextView that is displayed in a GridView. When the user taps on the TextView, a black circle has to be displayed in the center of this TextView. Actually this used to work fine on my tablet (an ASUS TF300, something like that). FYI all clicked textviews are then saved in a local database and can be loaded again.
I also tested that on a smartphone. Weird thing : the black circle is not displayed after a tap. However I know that it works because the black circles are well displayed if I save my UI and reload it again.
Did I miss something ?
Please find the code of the custom TextView below.
public class ChordItemTextView extends TextView {
// Properties
private ChordItem item;
public void setChordItem(ChordItem item)
{
this.item = item;
}
private Paint fretPaint;
private Paint chordPaint;
private Paint textPaint;
private int paperColor;
public ChordItemTextView(Context context) {
super(context);
this.Init(context);
}
public ChordItemTextView(Context context, AttributeSet attrs)
{
super(context, attrs);
this.Init(context);
}
private void Init(Context context)
{
// Resources retrieval
Resources myResources = getResources();
this.fretPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
this.fretPaint.setColor(myResources.getColor(R.color.fretColor));
this.chordPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
this.chordPaint.setColor(myResources.getColor(R.color.fretColor));
this.textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
this.textPaint.setColor(myResources.getColor(R.color.fretIndication));
this.textPaint.setTextSize(myResources.getDimension(R.dimen.fretFontSize));
this.paperColor = myResources.getColor(R.color.bgColor);
}
#Override
protected void onDraw(Canvas canvas) {
// paper color
canvas.drawColor(this.paperColor);
// fret line drawing
canvas.drawLine(0, getMeasuredHeight() / 2, getMeasuredWidth(), getMeasuredHeight() / 2, this.fretPaint);
canvas.drawLine((float) (getMeasuredWidth() * 0.99), 0, (float) (getMeasuredWidth() * 0.99), getMeasuredHeight(), this.fretPaint);
if (this.item.getFretNumber() == 0)
{
canvas.drawLine((float)( getMeasuredWidth() * 0.95), 0, (float)( getMeasuredWidth() * 0.95), getMeasuredHeight(), this.fretPaint);
}
// "tap" drawing
if (this.item.getIsPushed())
{
canvas.drawCircle(getMeasuredWidth() / 2, getMeasuredHeight() / 2, getMeasuredHeight() / 4, this.chordPaint);
}
// fret number drawing
if (this.item.getStringNumber() == 1)
{
canvas.drawText(String.valueOf(this.item.getFretNumber()), getMeasuredWidth() / 2, getMeasuredHeight(), this.textPaint);
}
super.onDraw(canvas);
}
}
Is there a simple way to have text be able to have a black outline? I have textviews that will be different colors, but some of the colors don't show up on my background so well, so I was wondering if there's an easy way to get a black outline or something else that will do the job? I'd prefer not to have to create a custom view and make a canvas and such.
outline effect can be achieved using shadow in TextView:
android:shadowColor="#000000"
android:shadowDx="1.5"
android:shadowDy="1.3"
android:shadowRadius="1.6"
android:text="CCC"
android:textAllCaps="true"
android:textColor="#android:color/white"
So, little late, but MagicTextView will do text outlines, amongst other things.
<com.qwerjk.better_text.MagicTextView
xmlns:qwerjk="http://schemas.android.com/apk/res/com.qwerjk.better_text"
android:textSize="78dp"
android:textColor="#ff333333"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
qwerjk:strokeColor="#FFff0000"
qwerjk:strokeJoinStyle="miter"
qwerjk:strokeWidth="5"
android:text="Magic" />
Note: I made this, and am posting more for the sake of future travelers than the OP.
It's borderline spam, but being on-topic, perhaps acceptable?
You can put a shadow behind the text, which can often help readability. Try experimenting with 50% translucent black shadows on your green text. Details on how to do this are over here: Android - shadow on text?
To really add a stroke around the text, you need to do something a bit more involved, like this:
How do you draw text with a border on a MapView in Android?
It is quite an old question but still I don't see any complete answers. So I am posting this solution, hoping that someone struggling with this problem might find it useful. The simplest and most effective solution is to override TextView class' onDraw method. Most implementations I have seen use drawText method to draw the stroke but that approach doesn't account for all the formatting alignment and text wrapping that goes in. And as a result often the stroke and text end up at different places. Following approach uses super.onDraw to draw both the stroke and fill parts of the text so you don't have to bother about rest of the stuff. Here are the steps
Extend TextView class
Override onDraw method
Set paint style to FILL
call parent class on Draw to render text in fill
mode.
save current text color.
Set current text color to your stroke color
Set paint style to Stroke
Set stroke width
And call parent class onDraw again to draw the stroke over the
previously rendered text.
package com.example.widgets;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.Button;
public class StrokedTextView extends Button {
private static final int DEFAULT_STROKE_WIDTH = 0;
// fields
private int _strokeColor;
private float _strokeWidth;
// constructors
public StrokedTextView(Context context) {
this(context, null, 0);
}
public StrokedTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public StrokedTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
if(attrs != null) {
TypedArray a = context.obtainStyledAttributes(attrs,R.styleable.StrokedTextAttrs);
_strokeColor = a.getColor(R.styleable.StrokedTextAttrs_textStrokeColor,
getCurrentTextColor());
_strokeWidth = a.getFloat(R.styleable.StrokedTextAttrs_textStrokeWidth,
DEFAULT_STROKE_WIDTH);
a.recycle();
}
else {
_strokeColor = getCurrentTextColor();
_strokeWidth = DEFAULT_STROKE_WIDTH;
}
//convert values specified in dp in XML layout to
//px, otherwise stroke width would appear different
//on different screens
_strokeWidth = dpToPx(context, _strokeWidth);
}
// getters + setters
public void setStrokeColor(int color) {
_strokeColor = color;
}
public void setStrokeWidth(int width) {
_strokeWidth = width;
}
// overridden methods
#Override
protected void onDraw(Canvas canvas) {
if(_strokeWidth > 0) {
//set paint to fill mode
Paint p = getPaint();
p.setStyle(Paint.Style.FILL);
//draw the fill part of text
super.onDraw(canvas);
//save the text color
int currentTextColor = getCurrentTextColor();
//set paint to stroke mode and specify
//stroke color and width
p.setStyle(Paint.Style.STROKE);
p.setStrokeWidth(_strokeWidth);
setTextColor(_strokeColor);
//draw text stroke
super.onDraw(canvas);
//revert the color back to the one
//initially specified
setTextColor(currentTextColor);
} else {
super.onDraw(canvas);
}
}
/**
* Convenience method to convert density independent pixel(dp) value
* into device display specific pixel value.
* #param context Context to access device specific display metrics
* #param dp density independent pixel value
* #return device specific pixel value.
*/
public static int dpToPx(Context context, float dp)
{
final float scale= context.getResources().getDisplayMetrics().density;
return (int) (dp * scale + 0.5f);
}
}
That is all. This class uses custom XML attributes to enable specifying stroke color and width from the XML layout files. Therefore, you need to add these attributes in your attr.xml file in subfolder 'values' under folder 'res'. Copy and paste the following in your attr.xml file.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="StrokedTextAttrs">
<attr name="textStrokeColor" format="color"/>
<attr name="textStrokeWidth" format="float"/>
</declare-styleable>
</resources>
Once you are done with that, you can use the custom StrokedTextView class in your XML layout files and specify stroke color and width as well. Here is an example
<com.example.widgets.StrokedTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Stroked text sample"
android:textColor="#android:color/white"
android:textSize="25sp"
strokeAttrs:textStrokeColor="#android:color/black"
strokeAttrs:textStrokeWidth="1.7" />
Remember to replace package name with your project's package name. Also add the xmlns namespace in the layout file in order to use custom XML attributes. You can add the following line in your layout file's root node.
xmlns:strokeAttrs="http://schemas.android.com/apk/res-auto"
The framework supports text-shadow but does not support text-outline. But there is a trick: shadow is something that is translucent and fades. Redraw the shadow a couple of times and all the alpha gets summed up and the result is an outline.
A very simple implementation extends TextView and overrides the draw(..) method. Every time a draw is requested our subclass does 5-10 drawings.
public class OutlineTextView extends TextView {
// Constructors
#Override
public void draw(Canvas canvas) {
for (int i = 0; i < 5; i++) {
super.draw(canvas);
}
}
}
<OutlineTextView
android:shadowColor="#000"
android:shadowRadius="3.0" />
I've just been trying to figure out how to do this and couldn't find a good guide online but eventually figured it out. As Steve Pomeroy suggested, you do have to do something more involved. In order to get the outlined text effect, you draw the text twice: once with a thick outline and then the second time we draw the main text over the outline. But, the task is made easier because you can very easily adapt one of the code samples provided with the SDK, namely the one under this name in your SDK directory: "/samples/android-/ApiDemos/src/com/example/android/apis/view/LabelView.java". Which can also found on the Android developer website here.
Depending on what you're doing, it's very easy to see you will only need to make minor modifications to that code, such as changing it to extend from TextView, etc. Before I discovered this sample I forgot to override onMeasure() (which you must do in addition to overriding onDraw() as is mentioned in the "Building Custom Components" guide on the Android Developer website), which is part of why I was having trouble.
Once you've done that, you can do what I did:
public class TextViewOutline extends TextView {
private Paint mTextPaint;
private Paint mTextPaintOutline; //add another paint attribute for your outline
...
//modify initTextViewOutline to setup the outline style
private void initTextViewOutline() {
mTextPaint = new Paint();
mTextPaint.setAntiAlias(true);
mTextPaint.setTextSize(16);
mTextPaint.setColor(0xFF000000);
mTextPaint.setStyle(Paint.Style.FILL);
mTextPaintOutline = new Paint();
mTextPaintOutline.setAntiAlias(true);
mTextPaintOutline.setTextSize(16);
mTextPaintOutline.setColor(0xFF000000);
mTextPaintOutline.setStyle(Paint.Style.STROKE);
mTextPaintOutline.setStrokeWidth(4);
setPadding(3, 3, 3, 3);
}
...
//make sure to update other methods you've overridden to handle your new paint object
...
//and finally draw the text, mAscent refers to a member attribute which had
//a value assigned to it in the measureHeight and Width methods
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawText(mText, getPaddingLeft(), getPaddingTop() - mAscent,
mTextPaintOutline);
canvas.drawText(mText, getPaddingLeft(), getPaddingTop() - mAscent, mTextPaint);
}
So, in order to get the outlined text effect, you draw the text twice: once with a thick outline and then the second time we draw the main text over the outline.
credit to #YGHM add shadow support
package com.megvii.demo;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
public class TextViewOutline extends android.support.v7.widget.AppCompatTextView {
// constants
private static final int DEFAULT_OUTLINE_SIZE = 0;
private static final int DEFAULT_OUTLINE_COLOR = Color.TRANSPARENT;
// data
private int mOutlineSize;
private int mOutlineColor;
private int mTextColor;
private float mShadowRadius;
private float mShadowDx;
private float mShadowDy;
private int mShadowColor;
public TextViewOutline(Context context) {
this(context, null);
}
public TextViewOutline(Context context, AttributeSet attrs) {
super(context, attrs);
setAttributes(attrs);
}
private void setAttributes(AttributeSet attrs) {
// set defaults
mOutlineSize = DEFAULT_OUTLINE_SIZE;
mOutlineColor = DEFAULT_OUTLINE_COLOR;
// text color
mTextColor = getCurrentTextColor();
if (attrs != null) {
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.TextViewOutline);
// outline size
if (a.hasValue(R.styleable.TextViewOutline_outlineSize)) {
mOutlineSize = (int) a.getDimension(R.styleable.TextViewOutline_outlineSize, DEFAULT_OUTLINE_SIZE);
}
// outline color
if (a.hasValue(R.styleable.TextViewOutline_outlineColor)) {
mOutlineColor = a.getColor(R.styleable.TextViewOutline_outlineColor, DEFAULT_OUTLINE_COLOR);
}
// shadow (the reason we take shadow from attributes is because we use API level 15 and only from 16 we have the get methods for the shadow attributes)
if (a.hasValue(R.styleable.TextViewOutline_android_shadowRadius)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowDx)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowDy)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowColor)) {
mShadowRadius = a.getFloat(R.styleable.TextViewOutline_android_shadowRadius, 0);
mShadowDx = a.getFloat(R.styleable.TextViewOutline_android_shadowDx, 0);
mShadowDy = a.getFloat(R.styleable.TextViewOutline_android_shadowDy, 0);
mShadowColor = a.getColor(R.styleable.TextViewOutline_android_shadowColor, Color.TRANSPARENT);
}
a.recycle();
}
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setPaintToOutline();
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
private void setPaintToOutline() {
Paint paint = getPaint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(mOutlineSize);
super.setTextColor(mOutlineColor);
super.setShadowLayer(0, 0, 0, Color.TRANSPARENT);
}
private void setPaintToRegular() {
Paint paint = getPaint();
paint.setStyle(Paint.Style.FILL);
paint.setStrokeWidth(0);
super.setTextColor(mTextColor);
super.setShadowLayer(mShadowRadius, mShadowDx, mShadowDy, mShadowColor);
}
#Override
public void setTextColor(int color) {
super.setTextColor(color);
mTextColor = color;
}
public void setOutlineSize(int size) {
mOutlineSize = size;
}
public void setOutlineColor(int color) {
mOutlineColor = color;
}
#Override
protected void onDraw(Canvas canvas) {
setPaintToOutline();
super.onDraw(canvas);
setPaintToRegular();
super.onDraw(canvas);
}
}
attr define
<declare-styleable name="TextViewOutline">
<attr name="outlineSize" format="dimension"/>
<attr name="outlineColor" format="color|reference"/>
<attr name="android:shadowRadius"/>
<attr name="android:shadowDx"/>
<attr name="android:shadowDy"/>
<attr name="android:shadowColor"/>
</declare-styleable>
xml code below
<com.megvii.demo.TextViewOutline
android:id="#+id/product_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="110dp"
android:background="#f4b222"
android:fontFamily="#font/kidsmagazine"
android:padding="10dp"
android:shadowColor="#d7713200"
android:shadowDx="0"
android:shadowDy="8"
android:shadowRadius="1"
android:text="LIPSTICK SET"
android:textColor="#android:color/white"
android:textSize="30sp"
app:outlineColor="#cb7800"
app:outlineSize="3dp" />
You can do this programmatically with the below snippet.
That provides white letters with black background:
textView.setTextColor(Color.WHITE);
textView.setShadowLayer(1.6f,1.5f,1.3f,Color.BLACK);
The parameters of the method are radius,dx,dy,color. You can change them for you specific needs.
I hope I will help someone that creates TextView programmatically and not having it inside xml.
Cheers to the stackOverflow community!
I want to add a solution in order to solve the performance issue. For example, the answer of #YGHM and a few others does the job, but it causes infinite call of onDraw because setTextColor calls invalidate(). So in order to solve it, you also need to override invalidate() and add a variable isDrawing that you will set to true, when onDraw() is in progress and drawing with a stroke. invalidate will return if the variable is true.
override fun invalidate() {
if (isDrawing) return
super.invalidate()
}
Your onDraw will look like this:
override fun onDraw(canvas: Canvas) {
if (strokeWidth > 0) {
isDrawing = true
val textColor = textColors.defaultColor
setTextColor(strokeColor)
paint.strokeWidth = strokeWidth
paint.style = Paint.Style.STROKE
super.onDraw(canvas)
setTextColor(textColor)
paint.strokeWidth = 0f
paint.style = Paint.Style.FILL
isDrawing = false
super.onDraw(canvas)
} else {
super.onDraw(canvas)
}
}
Here's the trick I found that works better than MagicTextView's stroke IMO
#Override
protected void onDraw(Canvas pCanvas) {
int textColor = getTextColors().getDefaultColor();
setTextColor(mOutlineColor); // your stroke's color
getPaint().setStrokeWidth(10);
getPaint().setStyle(Paint.Style.STROKE);
super.onDraw(pCanvas);
setTextColor(textColor);
getPaint().setStrokeWidth(0);
getPaint().setStyle(Paint.Style.FILL);
super.onDraw(pCanvas);
}
I've written a class to perform text with outline and still support all the other attributes and drawing of a normal text view.
it basically uses the super.onDraw(Canves canvas) on the TextView but draws twice with different styles.
hope this helps.
public class TextViewOutline extends TextView {
// constants
private static final int DEFAULT_OUTLINE_SIZE = 0;
private static final int DEFAULT_OUTLINE_COLOR = Color.TRANSPARENT;
// data
private int mOutlineSize;
private int mOutlineColor;
private int mTextColor;
private float mShadowRadius;
private float mShadowDx;
private float mShadowDy;
private int mShadowColor;
public TextViewOutline(Context context) {
this(context, null);
}
public TextViewOutline(Context context, AttributeSet attrs) {
super(context, attrs);
setAttributes(attrs);
}
private void setAttributes(AttributeSet attrs){
// set defaults
mOutlineSize = DEFAULT_OUTLINE_SIZE;
mOutlineColor = DEFAULT_OUTLINE_COLOR;
// text color
mTextColor = getCurrentTextColor();
if(attrs != null) {
TypedArray a = getContext().obtainStyledAttributes(attrs,R.styleable.TextViewOutline);
// outline size
if (a.hasValue(R.styleable.TextViewOutline_outlineSize)) {
mOutlineSize = (int) a.getDimension(R.styleable.TextViewOutline_outlineSize, DEFAULT_OUTLINE_SIZE);
}
// outline color
if (a.hasValue(R.styleable.TextViewOutline_outlineColor)) {
mOutlineColor = a.getColor(R.styleable.TextViewOutline_outlineColor, DEFAULT_OUTLINE_COLOR);
}
// shadow (the reason we take shadow from attributes is because we use API level 15 and only from 16 we have the get methods for the shadow attributes)
if (a.hasValue(R.styleable.TextViewOutline_android_shadowRadius)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowDx)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowDy)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowColor)) {
mShadowRadius = a.getFloat(R.styleable.TextViewOutline_android_shadowRadius, 0);
mShadowDx = a.getFloat(R.styleable.TextViewOutline_android_shadowDx, 0);
mShadowDy = a.getFloat(R.styleable.TextViewOutline_android_shadowDy, 0);
mShadowColor = a.getColor(R.styleable.TextViewOutline_android_shadowColor, Color.TRANSPARENT);
}
a.recycle();
}
PFLog.d("mOutlineSize = " + mOutlineSize);
PFLog.d("mOutlineColor = " + mOutlineColor);
}
private void setPaintToOutline(){
Paint paint = getPaint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(mOutlineSize);
super.setTextColor(mOutlineColor);
super.setShadowLayer(mShadowRadius, mShadowDx, mShadowDy, mShadowColor);
}
private void setPaintToRegular() {
Paint paint = getPaint();
paint.setStyle(Paint.Style.FILL);
paint.setStrokeWidth(0);
super.setTextColor(mTextColor);
super.setShadowLayer(0, 0, 0, Color.TRANSPARENT);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setPaintToOutline();
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
#Override
public void setTextColor(int color) {
super.setTextColor(color);
mTextColor = color;
}
#Override
public void setShadowLayer(float radius, float dx, float dy, int color) {
super.setShadowLayer(radius, dx, dy, color);
mShadowRadius = radius;
mShadowDx = dx;
mShadowDy = dy;
mShadowColor = color;
}
public void setOutlineSize(int size){
mOutlineSize = size;
}
public void setOutlineColor(int color){
mOutlineColor = color;
}
#Override
protected void onDraw(Canvas canvas) {
setPaintToOutline();
super.onDraw(canvas);
setPaintToRegular();
super.onDraw(canvas);
}
}
attr.xml
<declare-styleable name="TextViewOutline">
<attr name="outlineSize" format="dimension"/>
<attr name="outlineColor" format="color|reference"/>
<attr name="android:shadowRadius"/>
<attr name="android:shadowDx"/>
<attr name="android:shadowDy"/>
<attr name="android:shadowColor"/>
</declare-styleable>
I have created a library based on Nouman Hanif's answer with some additions. For example, fixing a bug that caused an indirect infinite loop on View.invalidate() calls.
OTOH, the library also supports outlined text in EditText widgets, as it was my real goal and it needed a bit more work than TextView.
Here is the link to my library: https://github.com/biomorgoth/android-outline-textview
Thanks to Nouman Hanif for the initial idea on the solution!
I found simple way to outline view without inheritance from TextView.
I had wrote simple library that use Android's Spannable for outlining text.
This solution gives possibility to outline only part of text.
I already had answered on same question (answer)
Class:
class OutlineSpan(
#ColorInt private val strokeColor: Int,
#Dimension private val strokeWidth: Float
): ReplacementSpan() {
override fun getSize(
paint: Paint,
text: CharSequence,
start: Int,
end: Int,
fm: Paint.FontMetricsInt?
): Int {
return paint.measureText(text.toString().substring(start until end)).toInt()
}
override fun draw(
canvas: Canvas,
text: CharSequence,
start: Int,
end: Int,
x: Float,
top: Int,
y: Int,
bottom: Int,
paint: Paint
) {
val originTextColor = paint.color
paint.apply {
color = strokeColor
style = Paint.Style.STROKE
this.strokeWidth = this#OutlineSpan.strokeWidth
}
canvas.drawText(text, start, end, x, y.toFloat(), paint)
paint.apply {
color = originTextColor
style = Paint.Style.FILL
}
canvas.drawText(text, start, end, x, y.toFloat(), paint)
}
}
Library: OutlineSpan
MagicTextView is very useful to make stroke font, but in my case, it cause error like
this
this error caused by duplication background attributes which set by MagicTextView
so you need to edit attrs.xml and MagicTextView.java
attrs.xml
<attr name="background" format="reference|color" />
↓
<attr name="mBackground" format="reference|color" />
MagicTextView.java 88:95
if (a.hasValue(R.styleable.MagicTextView_mBackground)) {
Drawable background = a.getDrawable(R.styleable.MagicTextView_mBackground);
if (background != null) {
this.setBackgroundDrawable(background);
} else {
this.setBackgroundColor(a.getColor(R.styleable.MagicTextView_mBackground, 0xff000000));
}
}
So you want a stroke around the textview? Unfortunately there is no simple way to do it with the styling. You'll have to create another view and place your textview over-top, making the parent view (the one it's on top of) just a few pixels bigger - this should create an outline.
Here is the simplest way I could find by extending TextView
public class CustomTextView extends androidx.appcompat.widget.AppCompatTextView {
float mStroke;
public CustomTextView(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.CustomTextView);
mStroke=a.getFloat(R.styleable.CustomTextView_stroke,1.0f);
a.recycle();
}
#Override
protected void onDraw(Canvas canvas) {
TextPaint paint = this.getPaint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(mStroke);
super.onDraw(canvas);
}
}
then you only need to add the following to the attrs.xml file
<declare-styleable name="CustomTextView">
<attr name="stroke" format="float"/>
</declare-styleable>
and now you will be able to set the stroke widht by app:stroke while retaining all other desirable properties of TextView. my solution only draws the stroke w/o a fill. this makes it a bit simpler than the others. bellow a screencapture with the result while setting a custom font to my customtextview.
I have an xml layout that has 3 input boxes and a 'generate' button.
When the user puts in there values there I'd like to draw a triangle underneath it
I know how to create a new view and go to it, but I'm not sure how to draw it on the same view being that I'm working with an xml view.
Below is a screenshot of what I want to do.
Thank you
http://i.stack.imgur.com/9oBJV.png
You could create a custom view class.
class Triangle extends View {
private int vertexA, vertexB, vertexC;
public Triangle(Context ctx){
this(ctx,null);
}
public Triangle(Context ctx, AttributeSet attrs){
this(ctx,attrs,0);
}
public Triangle(Context ctx, AttributeSet attrs, int defStyle){
super(ctx,attrs,defStyle);
}
public void setSides(int a, int b, int c){
this.vertexA = a;
this.vertexB = b;
this.vertexC = c;
this.invalidate();
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Try for a width based on our minimum
int minw = getPaddingLeft() + getPaddingRight() + getSuggestedMinimumWidth();
int w = resolveSizeAndState(minw, widthMeasureSpec, 1);
// Whatever the width ends up being, ask for a height that would let the triangle
// get as big as it can
int minh = MeasureSpec.getSize(w) - (int)mTextWidth + getPaddingBottom() + getPaddingTop();
int h = resolveSizeAndState(MeasureSpec.getSize(w) - (int)mTextWidth, heightMeasureSpec, 0);
setMeasuredDimension(w, h);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
Path path = new Path();
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.TRANSPARENT);
c.drawPaint(paint);
// start the path at the "origin"
path.MoveTo(10,10); // origin
// add a line for side A
path.lineTo(10,this.vertexA);
// add a line for side B
path.lineTo(this.vertexB,10);
// close the path to draw the hypotenuse
path.close();
paint.setStrokeWidth(3);
paint.setPathEffect(null);
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.STROKE);
c.drawPath(path, paint);
}
}
Note that I've hard coded the origin (the bottom left corner - the right angle) and only drawn 2 sides, since the hypotenuse is drawn by the closed path (this saves doing any extra maths). You'll want to play with onMeasure and scale your triangle as you need. Something like this:
path.lineTo(10, this.vertexA * yScale);
path.lineTo(this.vertexB * xScale ,10);
You're activity should check that the 3 values do indeed represent the sides of a right angled triangle, then call setSides(). I've added all 3 sides, although we are only using a and b. You could remove c if you prefer.
Please note that this is not copy/paste code. You will need to adapt it but it should give you a head start. Good luck.
Just put your custom view into the layout below the button. The exact xml to use depends on the type of your top level view container (which is probably a RelativeLayout).
To make it invisible at first you can set its visibility to INVISIBLE. When it should appear set the visibility to VISIBLE.
Is there a simple way to have text be able to have a black outline? I have textviews that will be different colors, but some of the colors don't show up on my background so well, so I was wondering if there's an easy way to get a black outline or something else that will do the job? I'd prefer not to have to create a custom view and make a canvas and such.
outline effect can be achieved using shadow in TextView:
android:shadowColor="#000000"
android:shadowDx="1.5"
android:shadowDy="1.3"
android:shadowRadius="1.6"
android:text="CCC"
android:textAllCaps="true"
android:textColor="#android:color/white"
So, little late, but MagicTextView will do text outlines, amongst other things.
<com.qwerjk.better_text.MagicTextView
xmlns:qwerjk="http://schemas.android.com/apk/res/com.qwerjk.better_text"
android:textSize="78dp"
android:textColor="#ff333333"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
qwerjk:strokeColor="#FFff0000"
qwerjk:strokeJoinStyle="miter"
qwerjk:strokeWidth="5"
android:text="Magic" />
Note: I made this, and am posting more for the sake of future travelers than the OP.
It's borderline spam, but being on-topic, perhaps acceptable?
You can put a shadow behind the text, which can often help readability. Try experimenting with 50% translucent black shadows on your green text. Details on how to do this are over here: Android - shadow on text?
To really add a stroke around the text, you need to do something a bit more involved, like this:
How do you draw text with a border on a MapView in Android?
It is quite an old question but still I don't see any complete answers. So I am posting this solution, hoping that someone struggling with this problem might find it useful. The simplest and most effective solution is to override TextView class' onDraw method. Most implementations I have seen use drawText method to draw the stroke but that approach doesn't account for all the formatting alignment and text wrapping that goes in. And as a result often the stroke and text end up at different places. Following approach uses super.onDraw to draw both the stroke and fill parts of the text so you don't have to bother about rest of the stuff. Here are the steps
Extend TextView class
Override onDraw method
Set paint style to FILL
call parent class on Draw to render text in fill
mode.
save current text color.
Set current text color to your stroke color
Set paint style to Stroke
Set stroke width
And call parent class onDraw again to draw the stroke over the
previously rendered text.
package com.example.widgets;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.Button;
public class StrokedTextView extends Button {
private static final int DEFAULT_STROKE_WIDTH = 0;
// fields
private int _strokeColor;
private float _strokeWidth;
// constructors
public StrokedTextView(Context context) {
this(context, null, 0);
}
public StrokedTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public StrokedTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
if(attrs != null) {
TypedArray a = context.obtainStyledAttributes(attrs,R.styleable.StrokedTextAttrs);
_strokeColor = a.getColor(R.styleable.StrokedTextAttrs_textStrokeColor,
getCurrentTextColor());
_strokeWidth = a.getFloat(R.styleable.StrokedTextAttrs_textStrokeWidth,
DEFAULT_STROKE_WIDTH);
a.recycle();
}
else {
_strokeColor = getCurrentTextColor();
_strokeWidth = DEFAULT_STROKE_WIDTH;
}
//convert values specified in dp in XML layout to
//px, otherwise stroke width would appear different
//on different screens
_strokeWidth = dpToPx(context, _strokeWidth);
}
// getters + setters
public void setStrokeColor(int color) {
_strokeColor = color;
}
public void setStrokeWidth(int width) {
_strokeWidth = width;
}
// overridden methods
#Override
protected void onDraw(Canvas canvas) {
if(_strokeWidth > 0) {
//set paint to fill mode
Paint p = getPaint();
p.setStyle(Paint.Style.FILL);
//draw the fill part of text
super.onDraw(canvas);
//save the text color
int currentTextColor = getCurrentTextColor();
//set paint to stroke mode and specify
//stroke color and width
p.setStyle(Paint.Style.STROKE);
p.setStrokeWidth(_strokeWidth);
setTextColor(_strokeColor);
//draw text stroke
super.onDraw(canvas);
//revert the color back to the one
//initially specified
setTextColor(currentTextColor);
} else {
super.onDraw(canvas);
}
}
/**
* Convenience method to convert density independent pixel(dp) value
* into device display specific pixel value.
* #param context Context to access device specific display metrics
* #param dp density independent pixel value
* #return device specific pixel value.
*/
public static int dpToPx(Context context, float dp)
{
final float scale= context.getResources().getDisplayMetrics().density;
return (int) (dp * scale + 0.5f);
}
}
That is all. This class uses custom XML attributes to enable specifying stroke color and width from the XML layout files. Therefore, you need to add these attributes in your attr.xml file in subfolder 'values' under folder 'res'. Copy and paste the following in your attr.xml file.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="StrokedTextAttrs">
<attr name="textStrokeColor" format="color"/>
<attr name="textStrokeWidth" format="float"/>
</declare-styleable>
</resources>
Once you are done with that, you can use the custom StrokedTextView class in your XML layout files and specify stroke color and width as well. Here is an example
<com.example.widgets.StrokedTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Stroked text sample"
android:textColor="#android:color/white"
android:textSize="25sp"
strokeAttrs:textStrokeColor="#android:color/black"
strokeAttrs:textStrokeWidth="1.7" />
Remember to replace package name with your project's package name. Also add the xmlns namespace in the layout file in order to use custom XML attributes. You can add the following line in your layout file's root node.
xmlns:strokeAttrs="http://schemas.android.com/apk/res-auto"
The framework supports text-shadow but does not support text-outline. But there is a trick: shadow is something that is translucent and fades. Redraw the shadow a couple of times and all the alpha gets summed up and the result is an outline.
A very simple implementation extends TextView and overrides the draw(..) method. Every time a draw is requested our subclass does 5-10 drawings.
public class OutlineTextView extends TextView {
// Constructors
#Override
public void draw(Canvas canvas) {
for (int i = 0; i < 5; i++) {
super.draw(canvas);
}
}
}
<OutlineTextView
android:shadowColor="#000"
android:shadowRadius="3.0" />
I've just been trying to figure out how to do this and couldn't find a good guide online but eventually figured it out. As Steve Pomeroy suggested, you do have to do something more involved. In order to get the outlined text effect, you draw the text twice: once with a thick outline and then the second time we draw the main text over the outline. But, the task is made easier because you can very easily adapt one of the code samples provided with the SDK, namely the one under this name in your SDK directory: "/samples/android-/ApiDemos/src/com/example/android/apis/view/LabelView.java". Which can also found on the Android developer website here.
Depending on what you're doing, it's very easy to see you will only need to make minor modifications to that code, such as changing it to extend from TextView, etc. Before I discovered this sample I forgot to override onMeasure() (which you must do in addition to overriding onDraw() as is mentioned in the "Building Custom Components" guide on the Android Developer website), which is part of why I was having trouble.
Once you've done that, you can do what I did:
public class TextViewOutline extends TextView {
private Paint mTextPaint;
private Paint mTextPaintOutline; //add another paint attribute for your outline
...
//modify initTextViewOutline to setup the outline style
private void initTextViewOutline() {
mTextPaint = new Paint();
mTextPaint.setAntiAlias(true);
mTextPaint.setTextSize(16);
mTextPaint.setColor(0xFF000000);
mTextPaint.setStyle(Paint.Style.FILL);
mTextPaintOutline = new Paint();
mTextPaintOutline.setAntiAlias(true);
mTextPaintOutline.setTextSize(16);
mTextPaintOutline.setColor(0xFF000000);
mTextPaintOutline.setStyle(Paint.Style.STROKE);
mTextPaintOutline.setStrokeWidth(4);
setPadding(3, 3, 3, 3);
}
...
//make sure to update other methods you've overridden to handle your new paint object
...
//and finally draw the text, mAscent refers to a member attribute which had
//a value assigned to it in the measureHeight and Width methods
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawText(mText, getPaddingLeft(), getPaddingTop() - mAscent,
mTextPaintOutline);
canvas.drawText(mText, getPaddingLeft(), getPaddingTop() - mAscent, mTextPaint);
}
So, in order to get the outlined text effect, you draw the text twice: once with a thick outline and then the second time we draw the main text over the outline.
credit to #YGHM add shadow support
package com.megvii.demo;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
public class TextViewOutline extends android.support.v7.widget.AppCompatTextView {
// constants
private static final int DEFAULT_OUTLINE_SIZE = 0;
private static final int DEFAULT_OUTLINE_COLOR = Color.TRANSPARENT;
// data
private int mOutlineSize;
private int mOutlineColor;
private int mTextColor;
private float mShadowRadius;
private float mShadowDx;
private float mShadowDy;
private int mShadowColor;
public TextViewOutline(Context context) {
this(context, null);
}
public TextViewOutline(Context context, AttributeSet attrs) {
super(context, attrs);
setAttributes(attrs);
}
private void setAttributes(AttributeSet attrs) {
// set defaults
mOutlineSize = DEFAULT_OUTLINE_SIZE;
mOutlineColor = DEFAULT_OUTLINE_COLOR;
// text color
mTextColor = getCurrentTextColor();
if (attrs != null) {
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.TextViewOutline);
// outline size
if (a.hasValue(R.styleable.TextViewOutline_outlineSize)) {
mOutlineSize = (int) a.getDimension(R.styleable.TextViewOutline_outlineSize, DEFAULT_OUTLINE_SIZE);
}
// outline color
if (a.hasValue(R.styleable.TextViewOutline_outlineColor)) {
mOutlineColor = a.getColor(R.styleable.TextViewOutline_outlineColor, DEFAULT_OUTLINE_COLOR);
}
// shadow (the reason we take shadow from attributes is because we use API level 15 and only from 16 we have the get methods for the shadow attributes)
if (a.hasValue(R.styleable.TextViewOutline_android_shadowRadius)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowDx)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowDy)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowColor)) {
mShadowRadius = a.getFloat(R.styleable.TextViewOutline_android_shadowRadius, 0);
mShadowDx = a.getFloat(R.styleable.TextViewOutline_android_shadowDx, 0);
mShadowDy = a.getFloat(R.styleable.TextViewOutline_android_shadowDy, 0);
mShadowColor = a.getColor(R.styleable.TextViewOutline_android_shadowColor, Color.TRANSPARENT);
}
a.recycle();
}
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setPaintToOutline();
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
private void setPaintToOutline() {
Paint paint = getPaint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(mOutlineSize);
super.setTextColor(mOutlineColor);
super.setShadowLayer(0, 0, 0, Color.TRANSPARENT);
}
private void setPaintToRegular() {
Paint paint = getPaint();
paint.setStyle(Paint.Style.FILL);
paint.setStrokeWidth(0);
super.setTextColor(mTextColor);
super.setShadowLayer(mShadowRadius, mShadowDx, mShadowDy, mShadowColor);
}
#Override
public void setTextColor(int color) {
super.setTextColor(color);
mTextColor = color;
}
public void setOutlineSize(int size) {
mOutlineSize = size;
}
public void setOutlineColor(int color) {
mOutlineColor = color;
}
#Override
protected void onDraw(Canvas canvas) {
setPaintToOutline();
super.onDraw(canvas);
setPaintToRegular();
super.onDraw(canvas);
}
}
attr define
<declare-styleable name="TextViewOutline">
<attr name="outlineSize" format="dimension"/>
<attr name="outlineColor" format="color|reference"/>
<attr name="android:shadowRadius"/>
<attr name="android:shadowDx"/>
<attr name="android:shadowDy"/>
<attr name="android:shadowColor"/>
</declare-styleable>
xml code below
<com.megvii.demo.TextViewOutline
android:id="#+id/product_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="110dp"
android:background="#f4b222"
android:fontFamily="#font/kidsmagazine"
android:padding="10dp"
android:shadowColor="#d7713200"
android:shadowDx="0"
android:shadowDy="8"
android:shadowRadius="1"
android:text="LIPSTICK SET"
android:textColor="#android:color/white"
android:textSize="30sp"
app:outlineColor="#cb7800"
app:outlineSize="3dp" />
You can do this programmatically with the below snippet.
That provides white letters with black background:
textView.setTextColor(Color.WHITE);
textView.setShadowLayer(1.6f,1.5f,1.3f,Color.BLACK);
The parameters of the method are radius,dx,dy,color. You can change them for you specific needs.
I hope I will help someone that creates TextView programmatically and not having it inside xml.
Cheers to the stackOverflow community!
I want to add a solution in order to solve the performance issue. For example, the answer of #YGHM and a few others does the job, but it causes infinite call of onDraw because setTextColor calls invalidate(). So in order to solve it, you also need to override invalidate() and add a variable isDrawing that you will set to true, when onDraw() is in progress and drawing with a stroke. invalidate will return if the variable is true.
override fun invalidate() {
if (isDrawing) return
super.invalidate()
}
Your onDraw will look like this:
override fun onDraw(canvas: Canvas) {
if (strokeWidth > 0) {
isDrawing = true
val textColor = textColors.defaultColor
setTextColor(strokeColor)
paint.strokeWidth = strokeWidth
paint.style = Paint.Style.STROKE
super.onDraw(canvas)
setTextColor(textColor)
paint.strokeWidth = 0f
paint.style = Paint.Style.FILL
isDrawing = false
super.onDraw(canvas)
} else {
super.onDraw(canvas)
}
}
Here's the trick I found that works better than MagicTextView's stroke IMO
#Override
protected void onDraw(Canvas pCanvas) {
int textColor = getTextColors().getDefaultColor();
setTextColor(mOutlineColor); // your stroke's color
getPaint().setStrokeWidth(10);
getPaint().setStyle(Paint.Style.STROKE);
super.onDraw(pCanvas);
setTextColor(textColor);
getPaint().setStrokeWidth(0);
getPaint().setStyle(Paint.Style.FILL);
super.onDraw(pCanvas);
}
I've written a class to perform text with outline and still support all the other attributes and drawing of a normal text view.
it basically uses the super.onDraw(Canves canvas) on the TextView but draws twice with different styles.
hope this helps.
public class TextViewOutline extends TextView {
// constants
private static final int DEFAULT_OUTLINE_SIZE = 0;
private static final int DEFAULT_OUTLINE_COLOR = Color.TRANSPARENT;
// data
private int mOutlineSize;
private int mOutlineColor;
private int mTextColor;
private float mShadowRadius;
private float mShadowDx;
private float mShadowDy;
private int mShadowColor;
public TextViewOutline(Context context) {
this(context, null);
}
public TextViewOutline(Context context, AttributeSet attrs) {
super(context, attrs);
setAttributes(attrs);
}
private void setAttributes(AttributeSet attrs){
// set defaults
mOutlineSize = DEFAULT_OUTLINE_SIZE;
mOutlineColor = DEFAULT_OUTLINE_COLOR;
// text color
mTextColor = getCurrentTextColor();
if(attrs != null) {
TypedArray a = getContext().obtainStyledAttributes(attrs,R.styleable.TextViewOutline);
// outline size
if (a.hasValue(R.styleable.TextViewOutline_outlineSize)) {
mOutlineSize = (int) a.getDimension(R.styleable.TextViewOutline_outlineSize, DEFAULT_OUTLINE_SIZE);
}
// outline color
if (a.hasValue(R.styleable.TextViewOutline_outlineColor)) {
mOutlineColor = a.getColor(R.styleable.TextViewOutline_outlineColor, DEFAULT_OUTLINE_COLOR);
}
// shadow (the reason we take shadow from attributes is because we use API level 15 and only from 16 we have the get methods for the shadow attributes)
if (a.hasValue(R.styleable.TextViewOutline_android_shadowRadius)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowDx)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowDy)
|| a.hasValue(R.styleable.TextViewOutline_android_shadowColor)) {
mShadowRadius = a.getFloat(R.styleable.TextViewOutline_android_shadowRadius, 0);
mShadowDx = a.getFloat(R.styleable.TextViewOutline_android_shadowDx, 0);
mShadowDy = a.getFloat(R.styleable.TextViewOutline_android_shadowDy, 0);
mShadowColor = a.getColor(R.styleable.TextViewOutline_android_shadowColor, Color.TRANSPARENT);
}
a.recycle();
}
PFLog.d("mOutlineSize = " + mOutlineSize);
PFLog.d("mOutlineColor = " + mOutlineColor);
}
private void setPaintToOutline(){
Paint paint = getPaint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(mOutlineSize);
super.setTextColor(mOutlineColor);
super.setShadowLayer(mShadowRadius, mShadowDx, mShadowDy, mShadowColor);
}
private void setPaintToRegular() {
Paint paint = getPaint();
paint.setStyle(Paint.Style.FILL);
paint.setStrokeWidth(0);
super.setTextColor(mTextColor);
super.setShadowLayer(0, 0, 0, Color.TRANSPARENT);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setPaintToOutline();
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
#Override
public void setTextColor(int color) {
super.setTextColor(color);
mTextColor = color;
}
#Override
public void setShadowLayer(float radius, float dx, float dy, int color) {
super.setShadowLayer(radius, dx, dy, color);
mShadowRadius = radius;
mShadowDx = dx;
mShadowDy = dy;
mShadowColor = color;
}
public void setOutlineSize(int size){
mOutlineSize = size;
}
public void setOutlineColor(int color){
mOutlineColor = color;
}
#Override
protected void onDraw(Canvas canvas) {
setPaintToOutline();
super.onDraw(canvas);
setPaintToRegular();
super.onDraw(canvas);
}
}
attr.xml
<declare-styleable name="TextViewOutline">
<attr name="outlineSize" format="dimension"/>
<attr name="outlineColor" format="color|reference"/>
<attr name="android:shadowRadius"/>
<attr name="android:shadowDx"/>
<attr name="android:shadowDy"/>
<attr name="android:shadowColor"/>
</declare-styleable>
I have created a library based on Nouman Hanif's answer with some additions. For example, fixing a bug that caused an indirect infinite loop on View.invalidate() calls.
OTOH, the library also supports outlined text in EditText widgets, as it was my real goal and it needed a bit more work than TextView.
Here is the link to my library: https://github.com/biomorgoth/android-outline-textview
Thanks to Nouman Hanif for the initial idea on the solution!
I found simple way to outline view without inheritance from TextView.
I had wrote simple library that use Android's Spannable for outlining text.
This solution gives possibility to outline only part of text.
I already had answered on same question (answer)
Class:
class OutlineSpan(
#ColorInt private val strokeColor: Int,
#Dimension private val strokeWidth: Float
): ReplacementSpan() {
override fun getSize(
paint: Paint,
text: CharSequence,
start: Int,
end: Int,
fm: Paint.FontMetricsInt?
): Int {
return paint.measureText(text.toString().substring(start until end)).toInt()
}
override fun draw(
canvas: Canvas,
text: CharSequence,
start: Int,
end: Int,
x: Float,
top: Int,
y: Int,
bottom: Int,
paint: Paint
) {
val originTextColor = paint.color
paint.apply {
color = strokeColor
style = Paint.Style.STROKE
this.strokeWidth = this#OutlineSpan.strokeWidth
}
canvas.drawText(text, start, end, x, y.toFloat(), paint)
paint.apply {
color = originTextColor
style = Paint.Style.FILL
}
canvas.drawText(text, start, end, x, y.toFloat(), paint)
}
}
Library: OutlineSpan
MagicTextView is very useful to make stroke font, but in my case, it cause error like
this
this error caused by duplication background attributes which set by MagicTextView
so you need to edit attrs.xml and MagicTextView.java
attrs.xml
<attr name="background" format="reference|color" />
↓
<attr name="mBackground" format="reference|color" />
MagicTextView.java 88:95
if (a.hasValue(R.styleable.MagicTextView_mBackground)) {
Drawable background = a.getDrawable(R.styleable.MagicTextView_mBackground);
if (background != null) {
this.setBackgroundDrawable(background);
} else {
this.setBackgroundColor(a.getColor(R.styleable.MagicTextView_mBackground, 0xff000000));
}
}
So you want a stroke around the textview? Unfortunately there is no simple way to do it with the styling. You'll have to create another view and place your textview over-top, making the parent view (the one it's on top of) just a few pixels bigger - this should create an outline.
Here is the simplest way I could find by extending TextView
public class CustomTextView extends androidx.appcompat.widget.AppCompatTextView {
float mStroke;
public CustomTextView(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.CustomTextView);
mStroke=a.getFloat(R.styleable.CustomTextView_stroke,1.0f);
a.recycle();
}
#Override
protected void onDraw(Canvas canvas) {
TextPaint paint = this.getPaint();
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(mStroke);
super.onDraw(canvas);
}
}
then you only need to add the following to the attrs.xml file
<declare-styleable name="CustomTextView">
<attr name="stroke" format="float"/>
</declare-styleable>
and now you will be able to set the stroke widht by app:stroke while retaining all other desirable properties of TextView. my solution only draws the stroke w/o a fill. this makes it a bit simpler than the others. bellow a screencapture with the result while setting a custom font to my customtextview.