How to use animation between two acitivities i.e. transition ?

Here's the code to do a nice smooth fade between two Activities..

Create a file called fadein.xml in res/anim

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
   android:interpolator="@android:anim/accelerate_interpolator"
   android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="2000" />

Create a file called fadeout.xml in res/anim

<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
   android:interpolator="@android:anim/accelerate_interpolator"
   android:fromAlpha="1.0" android:toAlpha="0.0" android:duration="2000" />

If you want to fade from Activity A to Activity B, put the following on button click

overridePendingTransition(R.anim.fadein, R.anim.fadeout);

If the fades are too slow for you, change android:duration in the xml files above to something smaller.

button_click.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

new Handler().postDelayed(new Runnable() {

@Override

public void run() {

Intent mainIntent = new Intent(this,B.class);

ctx.startActivity(mainIntent);

overridePendingTransition(R.anim.fadein, R.anim.fadeout);

}

}, 900);

}

});