Riiple Effect in Button onClickListener

RippleButton.java

package com.nhaarman.test;

import android.animation.ObjectAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RadialGradient;
import android.graphics.Region;
import android.graphics.Shader;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AccelerateInterpolator;
import android.widget.Button;

public class RippleButton extends Button implements OnClickListener {

    private float mDownX;
    private float mDownY;

    private float mRadius;

    private Paint mPaint;

    public RippleButton(final Context context) {
        super(context);
        init();
    }

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

    public RippleButton(final Context context, final AttributeSet attrs, final int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        mPaint = new Paint();
        mPaint.setAlpha(100);
        setOnClickListener(this);
    }

    @Override
    public boolean onTouchEvent(@NonNull final MotionEvent event) {
        if (event.getActionMasked() == MotionEvent.ACTION_UP) {
            mDownX = event.getX();
            mDownY = event.getY();
        }
        return super.onTouchEvent(event);
    }

    public void setRadius(final float radius) {
        mRadius = radius;
        if (mRadius > 0) {
            RadialGradient radialGradient = new RadialGradient(
                    mDownX,
                    mDownY,
                    mRadius * 3,
                    Color.TRANSPARENT,
                    Color.BLACK,
                    Shader.TileMode.MIRROR
            );
            mPaint.setShader(radialGradient);
        }
        invalidate();
    }

    private Path mPath = new Path();
    private Path mPath2 = new Path();

    @Override
    protected void onDraw(@NonNull final Canvas canvas) {
        super.onDraw(canvas);

        mPath2.reset();
        mPath2.addCircle(mDownX, mDownY, mRadius, Path.Direction.CW);

        canvas.clipPath(mPath2);

        mPath.reset();
        mPath.addCircle(mDownX, mDownY, mRadius / 3, Path.Direction.CW);

        canvas.clipPath(mPath, Region.Op.DIFFERENCE);

        canvas.drawCircle(mDownX, mDownY, mRadius, mPaint);
    }
    @Override
	public void onClick(View arg0) {
		
		ObjectAnimator animator = ObjectAnimator.ofFloat(this, "radius", 0,
				getWidth() * 3.0f);
		animator.setInterpolator(new AccelerateInterpolator());
		animator.setDuration(400);
		animator.start();
	}
	@Override
	public void setOnClickListener(final OnClickListener l) {
		
		super.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {

				RippleButton.this.onClick(v);
				l.onClick(v);
			}
		});
	}
}