[ACCEPTED]-Android - How to animate an activity transition when the default back button is pressed-back

maybe you can do this work in onBackPressed() method 1 in the activity.

@Override
public void onBackPressed() {
    super.onBackPressed();
    overridePendingTransition(R.anim.comming_in, R.anim.comming_out);   
}

Basically overriding onBackPressed is a 5 proper approach, but rather than call finish() from 4 it i would say that is better to call super.onBackPressed() and 3 then add overridePendingTransition so we 2 are a bit more consistent with the inheritance 1 rules.

@Override
public void onBackPressed() {
    super.onBackPressed();
    overridePendingTransition(R.anim.comming_in, R.anim.comming_out);   
}

Even though overriding onBackPressed() is a good option, I 12 would suggest overriding the finish() method, just 11 in case the activity is finished in some 10 other way, like a navigation action or any 9 other view action that "destroys" the activity:

@Override public void finish() {
   super.finish();
   overridePendingTransition(0,0);
}

We 8 need to have in consideration that this 7 method will be triggered after the back 6 button has been pressed, so we are good 5 to go :-)

Update: Moreover, overriding onBackPressed() could mess 4 up with the Activity if we are using fragments 3 in it, because we probably don't want to 2 be overriding the transitions every time 1 the back is pressed.

if you use fragment you can proceed like 1 this :

FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.setCustomAnimations(R.anim.anim_slide_in_left, R.anim.anim_slide_out_left, R.anim.anim_slide_out_right, R.anim.anim_slide_in_right);
transaction.replace(R.id.fragment_container, new YourClassFragment);
transaction.addToBackStack(null);
transaction.commit();

anim_slide_in_left

<?xml version="1.0" encoding="utf-8"?>
 <set xmlns:android="http://schemas.android.com/apk/res/android" >
  <translate
    android:duration="500"
    android:interpolator="@android:interpolator/decelerate_quint"
    android:fromXDelta="100%p"
    android:toXDelta="0%p" >
  </translate>
 </set>

anim_slide_out_left

<?xml version="1.0" encoding="utf-8"?>
 <set xmlns:android="http://schemas.android.com/apk/res/android" >
  <translate
    android:duration="500"
    android:interpolator="@android:interpolator/decelerate_quint"
    android:fromXDelta="0%p"
    android:toXDelta="-100%p" >
  </translate>
 </set>

anim_slide_out_right

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
 <translate
    android:duration="@android:integer/config_mediumAnimTime"
    android:interpolator="@android:interpolator/decelerate_quint"
    android:fromXDelta="-100%p"
    android:toXDelta="0%p" >
 </translate>
</set>

anim_slide_in_right

<?xml version="1.0" encoding="utf-8"?>
 <set xmlns:android="http://schemas.android.com/apk/res/android" >
  <translate
    android:duration="@android:integer/config_mediumAnimTime"
    android:interpolator="@android:interpolator/decelerate_quint"
    android:fromXDelta="0%p"
    android:toXDelta="100%p" >
  </translate>
 </set>