BottomSheetDialogFragment - listen to dismissed by user event

Although all similar questions on SO suggest using onDismiss I think following is the correct solution:

@Overridepublic void onCancel(DialogInterface dialog){    super.onCancel(dialog);    Toast.makeText(MainApp.get(), "CANCEL", Toast.LENGTH_SHORT).show();}

This fires if:

* the user presses back* the user presses outside of the dialog

This fires NOT:

* on screen rotation and activity recreation

Solution

Combine onCancel and BottomSheetBehavior.BottomSheetCallback.onStateChanged like following:

public class Dailog extends BottomSheetDialogFragment{    @Override    public void onCancel(DialogInterface dialog)    {        super.onCancel(dialog);        handleUserExit();    }    @Override    public Dialog onCreateDialog(Bundle savedInstanceState)    {        Dialog d = super.onCreateDialog(savedInstanceState);        d.setOnShowListener(new DialogInterface.OnShowListener() {            @Override            public void onShow(DialogInterface dialog) {                BottomSheetDialog d = (BottomSheetDialog) dialog;                FrameLayout bottomSheet = (FrameLayout) d.findViewById(android.support.design.R.id.design_bottom_sheet);                BottomSheetBehavior behaviour = BottomSheetBehavior.from(bottomSheet);                behaviour.setBottomSheetCallback(new BottomSheetBehavior.BottomSheetCallback() {                    @Override                    public void onStateChanged(@NonNull View bottomSheet, int newState) {                        if (newState == BottomSheetBehavior.STATE_HIDDEN)                        {                            handleUserExit();                            dismiss();                        }                    }                    @Override                    public void onSlide(@NonNull View bottomSheet, float slideOffset) {                    }                });            }        });        return d;    }    private void handleUserExit()    {        Toast.makeText(MainApp.get(), "TODO - SAVE data or similar", Toast.LENGTH_SHORT).show();    }}

If you extended from BottomSheetDialogFragment() just override in your class

 override fun onDismiss(dialog: DialogInterface) {        super.onDismiss(dialog)        //Code here    }

This will trigger when onBackPress and when you dismiss the dialog by clicking outside of it.

Make sure to NOT set your dialog as cancelable because this will not fire

i achieved this using this simple trick

val bottomSheetDialog = FeedbackFormsFragment.createInstance()bottomSheetDialog.show((activity as FragmentActivity).supportFragmentManager, BOTTOM_SHEET)// add some delay to allow the bottom sheet to be visible first so that the dialog is not null                Handler().postDelayed({                    bottomSheetDialog.dialog?.setOnDismissListener {                       // add code here                    }                }, 1000)