Getting results from DialogFragment to calling Fragment using Callbacks

DialogFragmentCallback.md

##Getting results from DialogFragments to another Fragment.

When setting up the DialogFragment make a call to Fragment.setTargetFragment()
Then from DialogFragment you can access the main fragment with Fragment.getTargetFragment()
Use interfaces to provide the required actions to the calling Fragment.

##Example code.

###AddFriendDialogFragment - Calls back to calling fragment.

public class AddFriendDialogFragment extends SherlockDialogFragment {
    private OnAddFriendListener callback;

    public interface OnAddFriendListener {
        public void onAddFriendSubmit(String friendEmail);
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        try {
             callback = (OnAddFriendListener) getTargetFragment();
         } catch (ClassCaseException e) {
             throw new ClassCastException("Calling Fragment must implement OnAddFriendListener"); 
         }
    }
    
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getSherlockActivity());
        builder.setTitle(R.string.dialog_add_friend)
                .setMessage(R.string.dialog_add_friend_text)
                .setView(editText)
                .setPositiveButton(R.string.add, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        // Grab the text from the input
                        final String friendEmail = editText.getText().toString();
                        callback.onAddFriendSubmit(friendEmail);
                    }
                })
                .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        AddFriendDialog.this.getDialog().cancel();
                    }
                });
        return builder.create();
    }

###Main fragment which displays the dialog and receives the callbacks from the dialog.

public class FriendsFragment extends SherlockListFragment implements OnAddFriendListener {
    
    ...

    private void showDialog() {
        FragmentManager fm = getSherlockActivity().getSupportFragmentManager();
        AddFriendDialogFragment addFriendDialog = new AddFriendDialogFragment();
        addFriendDialog.setTargetFragment(this, 0);
        addFriendDialog.show(fm, "add_friend_dialog");
    }

    @Override
    public void onAddFriendSubmit(String friendEmail) {
        // Do stuff
    }
}