Reveal animation for using from float button

RevealCircleView.java

package com.corewillsoft.loansdeposits.ui.widget;

import android.animation.Animator;
import android.animation.Animator.AnimatorListener;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.graphics.drawable.GradientDrawable;
import android.support.v7.internal.widget.ThemeUtils;
import android.util.AttributeSet;
import android.view.View;

import com.corewillsoft.loansdeposits.R;

public class RevealCircleView extends View {
    private AnimatorSet animatorSet;
    private float maxScale;
    private float minScale;
    private int animationDuration;

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

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

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

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

    private void init() {
        GradientDrawable drawable = (GradientDrawable) getResources().getDrawable(R.drawable.reveal_circle);
        drawable.setColor(ThemeUtils.getThemeAttrColor(getContext(), R.attr.colorAccent));
        setBackgroundDrawable(drawable);

        animationDuration = getResources().getInteger(R.integer.animation_duration);
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
        int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
        if (parentWidth > parentHeight) {
            super.onMeasure(widthMeasureSpec, widthMeasureSpec);
        } else {
            super.onMeasure(heightMeasureSpec, heightMeasureSpec);
        }
    }

    public void startAnimation(int x, int y) {
        if (animatorSet != null && animatorSet.isRunning()) {
            return;
        }
        maxScale = getMaxScale(x, y);
        minScale = (float) getResources().getDimensionPixelOffset(R.dimen.enter_button_size) / (float) getWidth();

        setTranslationX(x - getWidth() / 2);
        setTranslationY(y - getHeight() / 2);

        ObjectAnimator.ofFloat(this, ALPHA, 0, 1).setDuration(40).start();

        animatorSet = new AnimatorSet();
        animatorSet.playTogether(
                ObjectAnimator.ofFloat(this, SCALE_X, minScale, maxScale),
                ObjectAnimator.ofFloat(this, SCALE_Y, minScale, maxScale));
        animatorSet.setDuration(animationDuration);
        animatorSet.start();
    }

    public void endAnimation(AnimatorListener listener, int delay) {
        AnimatorSet revealSet = new AnimatorSet();
        revealSet.playTogether(
                ObjectAnimator.ofFloat(this, SCALE_X, maxScale, minScale),
                ObjectAnimator.ofFloat(this, SCALE_Y, maxScale, minScale));
        revealSet.setDuration(animationDuration);

        Animator fadeout = ObjectAnimator.ofFloat(this, View.ALPHA, 1, 0);
        fadeout.setDuration(150);

        animatorSet = new AnimatorSet();
        animatorSet.playSequentially(revealSet, fadeout);
        animatorSet.addListener(listener);
        animatorSet.setStartDelay(delay);
        animatorSet.start();
    }

    private float getMaxScale(int x, int y) {
        return (float) (Math.sqrt(x * x + y * y) / (float) getWidth()) * 2;
    }
}