Reference

http://www.androidhive.info/2013/06/android-working-with-xml-animations/

ex)

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

<set

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

android:interpolator="@android:anim/accelerate_interpolator"

>

<scale

android:fromXScale="1.0"

android:toXScale="20.0"

android:fromYScale="1.0"

android:toYScale="20.0"

android:pivotX="50%"

android:pivotY="50%"

android:duration="500"

/>

<alpha

android:fromAlpha="1.0"

android:toAlpha="-1.0"

android:duration="500"

/>

<rotate

android:fromDegrees="0.0"

android:toDegrees="360.0"

android:pivotX="50%"

android:pivotY="50%"

android:duration="500"

/>

</set>

fade_in.xml

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

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

    android:interpolator="@android:anim/accelerate_interpolator" >

    <alpha

        android:duration="2000"

        android:fromAlpha="0.0"

        android:toAlpha="1.0"

         />

</set>

fade_out.xml

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

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

    android:interpolator="@android:anim/accelerate_interpolator" >

    <alpha

        android:duration="2000"

        android:fromAlpha="1.0"

        android:toAlpha="0.0"

         />

</set>