Fragment pressing back button

Question

I am now having an activity containing fragments

[1] , [2] , [3] , [4]

If pressing buttons , [3] , it can be redirected to [4]

I would like to implement the back button as shown follow..

when pressing back at [4] , it return to [3]

when pressing back at [3] , it return to [2]

when pressing back at [1] , the activity finishes();

When it comes to the current implementation, it finish the activity instead of popping up the Fragment. Would you please tell me what I should do or keep in mind ?

@Override public boolean onKeyDown(int keyCode, KeyEvent event) {      if( keyCode==KeyEvent.KEYCODE_BACK)      {             finish();     }                 return super.onKeyDown(keyCode, event);   }    

Answer 1

This worked for me.

-Add .addToBackStack(null) when you call the new fragment from activity.

    FragmentTransaction mFragmentTransaction = getFragmentManager()                 .beginTransaction();     ....     mFragmentTransaction.addToBackStack(null); 

-Add onBackPressed() to your activity

    @Override public void onBackPressed() {     if (getFragmentManager().getBackStackEntryCount() == 0) {         this.finish();     } else {         getFragmentManager().popBackStack();     } } 

Answer 2

Easiest way ever:

onResume():

@Override public void onResume() {     super.onResume();      getView().setFocusableInTouchMode(true);     getView().requestFocus();     getView().setOnKeyListener(new View.OnKeyListener() {         @Override         public boolean onKey(View v, int keyCode, KeyEvent event) {             if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK) {                 // handle back button's click listener                 Toast.makeText(getActivity(), "Back press", Toast.LENGTH_SHORT).show();                 return true;             }             return false;         }     });  } 

Edit 1: If fragment having EditText.

private EditText editText; 

onCreateView():

editText = (EditText) rootView.findViewById(R.id.editText); 

onResume():

@Override public void onResume() {     super.onResume();      editText.setOnKeyListener(new View.OnKeyListener() {         @Override         public boolean onKey(View v, int keyCode, KeyEvent event) {             if (keyCode == KeyEvent.KEYCODE_BACK) {                 editText.clearFocus();             }             return false;         }     });      getView().setFocusableInTouchMode(true);     getView().requestFocus();     getView().setOnKeyListener(new View.OnKeyListener() {         @Override         public boolean onKey(View v, int keyCode, KeyEvent event) {             if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK) {                 // handle back button's click listener                 Toast.makeText(getActivity(), "Back press", Toast.LENGTH_SHORT).show();                 return true;             }             return false;         }     });  } 

Note: It will work if you have EditText in fragment.

Done