Alpha Animation in android

1.XML File

<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" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"
        android:id="@+id/t1" />

</RelativeLayout>

2.JAVA File

package com.example.alphaanim;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.animation.Animation;

import android.view.animation.AnimationUtils;

import android.widget.TextView;

public class MainActivity extends Activity {

TextView t;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

     t=(TextView)findViewById(R.id.t1);

     Animation animation  = AnimationUtils.loadAnimation(this, R.anim.alpha);

     t.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;

    }

    

}

3.Create a xml file(alpha) in res/anim/

<?xml version="1.0" encoding="utf-8"?>

<alpha xmlns:android="http://schemas.android.com/apk/res/android"

android:fromAlpha="0.0"

android:toAlpha="1.0"

android:duration="5000"

android:repeatCount="infinite" />