Created
July 10, 2014 16:42
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An ImageView which supports a foreground drawable.
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<?xml version="1.0" encoding="utf-8"?> | |
<resources> | |
<declare-styleable name="ForegroundImageView"> | |
<attr name="android:foreground"/> | |
</declare-styleable> | |
</resources> |
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import android.content.Context; | |
import android.content.res.TypedArray; | |
import android.graphics.Canvas; | |
import android.graphics.drawable.Drawable; | |
import android.util.AttributeSet; | |
import android.widget.ImageView; | |
public class ForegroundImageView extends ImageView { | |
private Drawable foreground; | |
public ForegroundImageView(Context context) { | |
this(context, null); | |
} | |
public ForegroundImageView(Context context, AttributeSet attrs) { | |
super(context, attrs); | |
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ForegroundImageView); | |
Drawable foreground = a.getDrawable(R.styleable.ForegroundImageView_android_foreground); | |
if (foreground != null) { | |
setForeground(foreground); | |
} | |
a.recycle(); | |
} | |
/** | |
* Supply a drawable resource that is to be rendered on top of all of the child | |
* views in the frame layout. | |
* | |
* @param drawableResId The drawable resource to be drawn on top of the children. | |
*/ | |
public void setForegroundResource(int drawableResId) { | |
setForeground(getContext().getResources().getDrawable(drawableResId)); | |
} | |
/** | |
* Supply a Drawable that is to be rendered on top of all of the child | |
* views in the frame layout. | |
* | |
* @param drawable The Drawable to be drawn on top of the children. | |
*/ | |
public void setForeground(Drawable drawable) { | |
if (foreground == drawable) { | |
return; | |
} | |
if (foreground != null) { | |
foreground.setCallback(null); | |
unscheduleDrawable(foreground); | |
} | |
foreground = drawable; | |
if (drawable != null) { | |
drawable.setCallback(this); | |
if (drawable.isStateful()) { | |
drawable.setState(getDrawableState()); | |
} | |
} | |
requestLayout(); | |
invalidate(); | |
} | |
@Override protected boolean verifyDrawable(Drawable who) { | |
return super.verifyDrawable(who) || who == foreground; | |
} | |
@Override public void jumpDrawablesToCurrentState() { | |
super.jumpDrawablesToCurrentState(); | |
if (foreground != null) foreground.jumpToCurrentState(); | |
} | |
@Override protected void drawableStateChanged() { | |
super.drawableStateChanged(); | |
if (foreground != null && foreground.isStateful()) { | |
foreground.setState(getDrawableState()); | |
} | |
} | |
@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { | |
super.onMeasure(widthMeasureSpec, heightMeasureSpec); | |
if (foreground != null) { | |
foreground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight()); | |
invalidate(); | |
} | |
} | |
@Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { | |
super.onSizeChanged(w, h, oldw, oldh); | |
if (foreground != null) { | |
foreground.setBounds(0, 0, w, h); | |
invalidate(); | |
} | |
} | |
@Override public void draw(Canvas canvas) { | |
super.draw(canvas); | |
if (foreground != null) { | |
foreground.draw(canvas); | |
} | |
} | |
} |
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Unfortunately this solution is only available on APIs >= 23, and if your image has rounded corners the ripple will go past them.
A solution that solves all problems is to use
tint
andtintMode
as described in this Medium article, and it requires 0 Java/Kotlin code or external library.