Android - Simulate Back Button

Question

When i press a button in my app, I need to return to the last activity.

Any ideas?

Answer 1

This is for a situation where the same fragment may sometimes be the only fragment in an activity, and sometimes part of a multi-fragment activity, for example on a tablet where two fragments are visible at the same time.

/**
 * Method that can be used by a fragment that has been started by MainFragment to terminate
 * itself. There is some controversy as to whether a fragment should remove itself from the back
 * stack, or if that is a violation of the Android design specs for fragments. See here:
 * http://stackoverflow.com/questions/5901298/how-to-get-a-fragment-to-remove-itself-i-e-its-equivalent-of-finish
 */
public static void fragmentImplementCancel(Fragment fragment) {

    FragmentActivity fragmentActivity = fragment.getActivity();
    FragmentManager fragmentManager = fragmentActivity.getSupportFragmentManager();

    if (fragmentManager.getBackStackEntryCount() == 1) {
        fragmentManager.popBackStack();
    }
    else {
        fragmentActivity.finish();
    }
}

This code can be called to implement a Cancel button, for example.

    if (theButton.getId() == R.id.btnStatusCancel) {
        StaticMethods.fragmentImplementCancel(this);
    }