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);
}
});
}
}


