Fragment 处理 back键返回（handle keycode_back in Fragment）

BackListenerFragment

getSupportFragmentManager().beginTransaction().replace(R.id.container, new BackListenerFragment()).addToBackStack("callback").commit();

//inside BackListenerFragment
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
   super.onViewCreated(view, savedInstanceState);
   view.setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
           if (keyCode == KeyEvent.KEYCODE_BACK) {
               //TODO：handle back event
               return true;
           }
           return false;
        }
        });
}