DialogFragment and onDismiss

Question

I am using a DialogFragment, which I am showing like this from an Activity:

DialogFragmentImage dialog = DialogFragmentImage.newInstance(createBitmap()); dialog.onDismiss(dialog);.onDismiss(this);           dialog.show(getFragmentManager(), "DialogFragmentImage"); 

I would like to check when the DialogFragment was dismissed (for example when the back button was pressed), but in my Activity. How can I do that? How can I "tell" my activity that the DialogFragment has been dismissed?

Answer 1

Make your Activity implement OnDismissListener

public final class YourActivity extends Activity implements DialogInterface.OnDismissListener {      @Override     public void onDismiss(final DialogInterface dialog) {         //Fragment dialog had been dismissed     }  } 

DialogFragment already implements OnDismissListener, just override the method and call the Activity.

public final class DialogFragmentImage extends DialogFragment {      ///blah blah      @Override     public void onDismiss(final DialogInterface dialog) {         super.onDismiss(dialog);         final Activity activity = getActivity();         if (activity instanceof DialogInterface.OnDismissListener) {             ((DialogInterface.OnDismissListener) activity).onDismiss(dialog);         }     }  } 

If you're starting the dialog from a fragment using the childFragment manager (API>=17), you can use getParentFragment to talk to the onDismissListener on the parent fragment.:

public final class DialogFragmentImage extends DialogFragment {      ///blah blah      @Override     public void onDismiss(final DialogInterface dialog) {         super.onDismiss(dialog);         Fragment parentFragment = getParentFragment();         if (parentFragment instanceof DialogInterface.OnDismissListener) {             ((DialogInterface.OnDismissListener) parentFragment).onDismiss(dialog);         }      }  } 

Answer 2

Here is my answer. It's a bit late but it's maybe benefit someone passing by.

FragmentManager fm = getFragmentManager();  YourDialogFragment dialog = new YourDialogFragment(); dialog.show(fm,"MyDialog");  fm.executePendingTransactions(); dialog.getDialog().setOnDismissListener(new DialogInterface.OnDismissListener() {                     @Override                     public void onDismiss(DialogInterface dialogInterface) {                        //do whatever you want when dialog is dismissed                     }                 }); 

We need to call

fm.executePendingTransactions();  

To make sure that FragmentTransaction work has been performed. Otherwise NullPointerException can occur when calling setOnDismissListener().

Sorry if there is any mistake. Hope this help.