Robust way to pass value back from Dialog to Activity on Android?

Question

This question has come up several times and I\'ve read all the answers, but I haven\'t seen a truly robust way to handle this. In my solution, I am using listeners from the

Answer 1

You are on the right track, I follow the method recommended by the Android Developers - Using DialogFragments article.

You create your DialogFragment and define an interface that the Activity will implement, like you have done above with this:

public interface MyDialogFragmentListener {
    public void onReturnValue(String foo);
}

Then in the DialogFragment when you want to return the result to the Activity you cast the activity to the interface:

@Override
public void onClick(DialogInterface dialog, int id) {
    MyDialogFragmentListener activity = (MyDialogFragmentListener) getActivity();
    activity.onReturnValue("some value");
}

Then in the Activity you implement that interface and grab the value:

public class MyActivity implements MyDialogFragmentListener {
    ...
    @Override
    public void onReturnValue(String foo) {
        Log.i("onReturnValue", "Got value " + foo + " back from Dialog!");
    }
}

Answer 2

Very old post but...

I had appropriate variables in the dialog class:

int selectedFooStatus = 0; 

Manipulated them when the dialog was interacted with:

.setSingleChoiceItems(FOO_CHOICES, -1, new DialogInterface.OnClickListener() {
                   @Override
                   public void onClick(DialogInterface dialog, int which) {

                       selectedFooStatus = which; 

                   }})

In the onclick call back method I cast the returning fragment appropriately and used a getter to return the value.

    public void onDialogPositiveClick(DialogFragment dialog) {

                ChangeFooStatusDialog returnedDialog = (ChangeFooStatusDialog) dialog;

                this.fooStatus = returnedDialog.getSelectedFooStatus();

}

Answer 3

You can fire off an Intent from your Dialog's onClickListner which the Activity will be listening for.

Take a look at this tutorial on Broadcasting and Receiving Intents