How to disable back button pressed in android fragment class

Question

I want to disable the back button in a fragment class. onBackPressed() doesn\'t seem to work in this fragment. How could I disable the back button?

This

Answer 1

I know it's too late, In fragment onCreate

val callback = requireActivity().onBackPressedDispatcher.addCallback(this) {
Log.d("tag","back button pressed")    // Handle the back button event
}

callback.isEnabled

Answer 2

Here is the new way you can manage your onBackPressed() in fragment with the new call back of activity:

    // Disable onBack click
    requireActivity().onBackPressedDispatcher.addCallback(this) {
      // With blank your fragment BackPressed will be disabled.
    }

Answer 3

if you want to fragment never closed without any button action you can try to prevent cancel Fragment.

In your fragment method add this

 this.setCancelable(false);

Answer 4

You have to override onBackPressed of parent FragmentActivity class. Therefore, put your codes in parent FragmentActivity. Or you can call parent's method by using this:

public void callParentMethod(){
    getActivity().onBackPressed();
}

in FragmentActivity override onBackPressed Method and not call its super class to disable back button.

@Override
public void onBackPressed() {
  //super.onBackPressed();
  //create a dialog to ask yes no question whether or not the user wants to exit
  ...
}

Answer 5

OnBackPressedCallback

Here is the code which you can write in your Fragment class to customize the back button press.

public class MyFragment extends Fragment{

    @Override
    public void onCreate(Bundle savedInstanceState){

        super.onCreate(savedInstanceState);

        OnBackPressedCallback callback = new OnBackPressedCallback(true /* enabled by default */) {
            @Override
            public void handleOnBackPressed() {
                // Handle the back button even
                Log.d("BACKBUTTON", "Back button clicks");
            }
        };

        requireActivity().getOnBackPressedDispatcher().addCallback(this, callback);

     }

}

Relevant link

You can read and research more on this HERE

Answer 6

In your oncreateView() method you need to write this code and in KEYCODE_BACk return should true then it will stop the back button option for particular fragment

     View v = inflater.inflate(R.layout.xyz, container, false);
    //Back pressed Logic for fragment  
    v.setFocusableInTouchMode(true);  
    v.requestFocus();  
    v.setOnKeyListener(new View.OnKeyListener() {  
    @Override  
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            if (keyCode == KeyEvent.KEYCODE_BACK) {

                return true;  
            }  
        }  
        return false;  
    }  
});