His code is used for anim translation.

input.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <translate
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="@android:integer/config_longAnimTime"
        android:fromXDelta="100%p"
        android:toXDelta="0%p" />

    <alpha
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="1000"
        android:fromAlpha="0"
        android:toAlpha="1" />

</set>

How use? Example:

startActivity(new Intent(getApplicationContext(),
LoginActivity.class));
SplashActivity.this.overridePendingTransition(R.anim.entrada,
R.anim.salida);
finish();