A selectable RelativeLayout that will show Android's selectableItemBackground on foreground (ripple on Lollipop+) when touched.

SelectableRelativeLayout.java

import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

/**
 * RelativeLayout with ripple effect / select foreground when touched
 */
public abstract class SelectableRelativeLayout extends RelativeLayout {

    private Drawable mForegroundSelector;

    public SelectableRelativeLayout(Context context) {
        super(context);
        init(context);
    }

    public SelectableRelativeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public SelectableRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public SelectableRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        init(context);
    }

    protected void init(Context context) {
        TypedArray ta = context.obtainStyledAttributes(new int[]{android.R.attr.selectableItemBackground});
        mForegroundSelector = ta.getDrawable(0);
        assert mForegroundSelector != null;
        mForegroundSelector.setCallback(this);
        ta.recycle();
        setWillNotDraw(false);
    }

    @Override
    protected void drawableStateChanged() {
        super.drawableStateChanged();
        mForegroundSelector.setState(getDrawableState());
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        mForegroundSelector.setBounds(0, 0, w, h);
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);
        mForegroundSelector.draw(canvas);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        mForegroundSelector.draw(canvas);
    }

    @Override
    public void jumpDrawablesToCurrentState() {
        super.jumpDrawablesToCurrentState();
        mForegroundSelector.jumpToCurrentState();
    }

    @Override
    protected boolean verifyDrawable(Drawable who) {
        return super.verifyDrawable(who) || (who == mForegroundSelector);
    }

    @Override
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public void dispatchDrawableHotspotChanged(float x, float y) {
        super.dispatchDrawableHotspotChanged(x, y);
        mForegroundSelector.setHotspot(x, y);
    }
}

Why is it abstract? Anyway, it works, thanks 👍