onBackPressed() Best Practice/Performance

Question

I usually override onBackPressed() like this:

@Override
public void onBackPressed() {
    super.onBackPressed();
    Intent intent = new Intent(getApplicationContext(), HomeActivity.class);
    startActivity(intent);
    finish();
}

Only now I saw that when I click the back button with this code I see for 0.5 sec a white activity in the transition.

Testing a little bit I found that if I use this code instead the problem didn't happen:

@Override
public void onBackPressed() {
    Intent intent = new Intent(getApplicationContext(), HomeActivity.class);
    startActivity(intent);
    finish();
    super.onBackPressed();
}

What's the difference between this two code? If I use the second one is fine? Cause any memory problem? Thanks

Answer 1

super.onBackPressed just calls finish. It isn't needed if you're calling finish yourself. Just remove the line.

The reason you may see a visual difference is that in one you're finishing this intent then starting a new one, vs starting a new one then finishing this one. The first may leave a blank screen briefly.