Android Fragment handle back button press [duplicate]

Answer 1

Use addToBackStack method when replacing one fragment by another:

getFragmentManager().beginTransaction().replace(R.id.content_frame, fragment).addToBackStack("my_fragment").commit();

Then in your activity, use the following code to go back from a fragment to another (the previous one).

@Override
public void onBackPressed() {
    if (getFragmentManager().getBackStackEntryCount() > 0) {
        getFragmentManager().popBackStack();
    } else {
        super.onBackPressed();
    }
}