CircularRevealActivity.java

package com.thejakeofink.circlularrevealanimation;

import android.animation.Animator;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.view.animation.FastOutSlowInInterpolator;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewAnimationUtils;

public class CircularRevealActivity extends AppCompatActivity {

    FloatingActionButton fab;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        final View overlay = findViewById(R.id.overlayView);
        if (overlay != null) {
            overlay.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int fabXCenter;
                    int fabYCenter;
                    int[] fabCoords = new int[2];
                    fab.getLocationOnScreen(fabCoords);
                    fabXCenter = fabCoords[0] + (fab.getMeasuredWidth() / 2);
                    fabYCenter = fabCoords[1];
                    Animator circularHide = ViewAnimationUtils.createCircularReveal(overlay,
                            fabXCenter, fabYCenter,
                            (int) Math.hypot(overlay.getMeasuredWidth(), overlay.getMeasuredHeight()), 0);

                    circularHide.addListener(new Animator.AnimatorListener() {
                        @Override
                        public void onAnimationStart(Animator animation) {

                        }

                        @Override
                        public void onAnimationEnd(Animator animation) {
                            overlay.setVisibility(View.INVISIBLE);
                        }

                        @Override
                        public void onAnimationCancel(Animator animation) {

                        }

                        @Override
                        public void onAnimationRepeat(Animator animation) {

                        }
                    });
                    circularHide.setInterpolator(new FastOutSlowInInterpolator());
                    circularHide.start();
                }
            });
        }

        fab = (FloatingActionButton) findViewById(R.id.fab);
        if (fab != null) {
            fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    int fabXCenter;
                    int fabYCenter;
                    int[] fabCoords = new int[2];
                    fab.getLocationOnScreen(fabCoords);
                    fabXCenter = fabCoords[0] + (fab.getMeasuredWidth() / 2);
                    fabYCenter = fabCoords[1];
                    Animator circularReveal = ViewAnimationUtils.createCircularReveal(overlay,
                            fabXCenter, fabYCenter, 0,
                            (int) Math.hypot(overlay.getMeasuredWidth(), overlay.getMeasuredHeight()));
                    overlay.setVisibility(View.VISIBLE);
                    circularReveal.setInterpolator(new FastOutSlowInInterpolator());
                    circularReveal.start();
                }
            });
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}