activity1.java

    public void onShouldStartActivity() {
        // creation of intent to start activity2
        Intent intent = new Intent(this, Activity2.class);
        
        startActivity(intent);

        // Following the documentation, right after starting the activity
        // we override the transition
        overridePendingTransition(R.anim.activity_in, R.anim.activity_out);
    }