main_activity_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <scale
        android:duration="400"
        android:fromXScale="1"
        android:toXScale="1"
        android:fromYScale="1"
        android:toYScale="1"
        android:pivotX="50%p"
        android:pivotY="50%p"

        />
    <alpha
        android:duration="400"
        android:fromAlpha="0"
        android:toAlpha="1" />

</set>