android - Button blink fade in fade out animation

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/coordinator_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#c42cab"
    >
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button Blink Animation"
        android:layout_gravity="center"
        android:padding="50dp"
        />
</android.support.design.widget.CoordinatorLayout>

res/anim/alpha_animation.xml

<?xml version="1.0" encoding="utf-8"?>
<alpha
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="500"
    android:fromAlpha="1"
    android:toAlpha="0.05"
    android:repeatCount="5"
    android:repeatMode="reverse"
    />

MainActivity.java

package com.cfsuman.me.androidcodesnippets;

import android.app.Activity;
import android.content.Context;
import android.support.design.widget.CoordinatorLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;


public class MainActivity extends AppCompatActivity {
    private Context mContext;
    private Activity mActivity;

    private CoordinatorLayout mCLayout;
    private Button mButton;
    private Animation mAlphaAnimation;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Get the application context
        mContext = getApplicationContext();
        mActivity = MainActivity.this;

        // Get the widget reference from XML layout
        mCLayout = (CoordinatorLayout) findViewById(R.id.coordinator_layout);
        mButton = (Button) findViewById(R.id.btn);

        // Get the animation from resource file
        mAlphaAnimation = AnimationUtils.loadAnimation(mContext,R.anim.alpha_animation);

        // Initialize a new click listener for button widget
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Start the blink animation (fade in and fade out animation)
                mButton.startAnimation(mAlphaAnimation);
            }
        });
    }
}