How to Perform Tween Animation(Blink) in Android

In this tutorial how to perform Blinking in Tween Animation in Android is shown.

Points to Remember:

  • For creating the blink.xml file you will have to first create anim folder under res folder.
  • At the time of creating blink.xml file you can either select ‘alpha’ or ‘set’ as Root Element.

Code:

activity_main.xml

<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android”
xmlns:tools=”http://schemas.android.com/tools”
android:layout_width=”match_parent”
android:layout_height=”match_parent”
android:paddingBottom=”@dimen/activity_vertical_margin”
android:paddingLeft=”@dimen/activity_horizontal_margin”
android:paddingRight=”@dimen/activity_horizontal_margin”
android:paddingTop=”@dimen/activity_vertical_margin”
tools:context=”.MainActivity” >

<ImageView
android:id=”@+id/imageView1″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_alignParentTop=”true”
android:layout_centerHorizontal=”true”
android:src=”@drawable/tweenedanm” />

<Button
android:id=”@+id/b1″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_alignBottom=”@+id/imageView1″
android:layout_centerHorizontal=”true”
android:layout_marginBottom=”28dp”
android:onClick=”onBlink”
android:text=”Blink” />

</RelativeLayout>

 

res/anim/blink.xml

<?xml version=”1.0″ encoding=”utf-8″?>
<set xmlns:android=”http://schemas.android.com/apk/res/android”>
<alpha android:fromAlpha=”0.0″
android:toAlpha=”1.0″
android:interpolator=”@android:anim/accelerate_interpolator”
android:duration=”500″
android:repeatMode=”reverse”
android:repeatCount=”infinite”></alpha>

</set>

 

MainActivity.java

package com.example.demo;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;

public class MainActivity extends Activity{

ImageView iv;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iv=(ImageView)findViewById(R.id.imageView1);
}

public void onBlink(View v)
{
Animation animation=AnimationUtils.loadAnimation(getApplicationContext(), R.anim.blink);
iv.startAnimation(animation);
}

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

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