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RelativeLayout with foreground like FrameLayout does.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="FRelativeLayout">
<attr name="foreground" format="reference|color" />
</declare-styleable>
</resources>
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.widget.RelativeLayout;
public class FRelativeLayout extends RelativeLayout {
private Drawable mForegroundSelector;
private Rect mRectPadding;
private boolean mUseBackgroundPadding = false;
public FRelativeLayout(Context context) {
super(context);
}
public FRelativeLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FRelativeLayout,
defStyle, 0);
final Drawable d = a.getDrawable(R.styleable.FRelativeLayout_foreground);
if (d != null) {
setForeground(d);
}
a.recycle();
if (this.getBackground() instanceof NinePatchDrawable) {
final NinePatchDrawable npd = (NinePatchDrawable) this.getBackground();
if (npd != null) {
mRectPadding = new Rect();
if (npd.getPadding(mRectPadding)) {
mUseBackgroundPadding = true;
}
}
}
}
@Override
protected void drawableStateChanged() {
super.drawableStateChanged();
if (mForegroundSelector != null && mForegroundSelector.isStateful()) {
mForegroundSelector.setState(getDrawableState());
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (mForegroundSelector != null) {
if (mUseBackgroundPadding) {
mForegroundSelector.setBounds(mRectPadding.left, mRectPadding.top, w - mRectPadding.right, h - mRectPadding.bottom);
} else {
mForegroundSelector.setBounds(0, 0, w, h);
}
}
}
@Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
if (mForegroundSelector != null) {
mForegroundSelector.draw(canvas);
}
}
@Override
protected boolean verifyDrawable(Drawable who) {
return super.verifyDrawable(who) || (who == mForegroundSelector);
}
@Override
public void jumpDrawablesToCurrentState() {
super.jumpDrawablesToCurrentState();
if (mForegroundSelector != null) mForegroundSelector.jumpToCurrentState();
}
public void setForeground(Drawable drawable) {
if (mForegroundSelector != drawable) {
if (mForegroundSelector != null) {
mForegroundSelector.setCallback(null);
unscheduleDrawable(mForegroundSelector);
}
mForegroundSelector = drawable;
if (drawable != null) {
setWillNotDraw(false);
drawable.setCallback(this);
if (drawable.isStateful()) {
drawable.setState(getDrawableState());
}
} else {
setWillNotDraw(true);
}
requestLayout();
invalidate();
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
android:exitFadeDuration="200" >
<item android:drawable="@drawable/list_selector_pressed" android:state_pressed="true"/> <!-- pressed -->
<item android:drawable="@android:color/transparent"/> <!-- default -->
</selector>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#7f0099cc" />
</shape>
@beanmilk

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@beanmilk beanmilk commented Jul 29, 2014

Thank you for this useful code!!

Can you tell me which license is used for this source?

Happy coding! :)

@renaudcerrato

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@renaudcerrato renaudcerrato commented Dec 29, 2014

To support Lollipop's ripples, you should add:

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @Override
    public void drawableHotspotChanged(float x, float y) {
        super.drawableHotspotChanged(x, y);
        if (mForegroundSelector != null) {
            mForegroundSelector.setHotspot(x, y);
        }
    }
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