Receive result from DialogFragment

Question

Use myDialogFragment.setTargetFragment(this, MY_REQUEST_CODE) from the place where you show the dialog, and then when your dialog is finished, from it you can call getTargetFragment().onActivityResult(getTargetRequestCode(), ...), and implement onActivityResult() in the containing fragment.

It seems like an abuse of onActivityResult(), especially as it doesn't involve activities at all. But I've seen it recommended by official google people, and maybe even in the api demos. I think it's what g/setTargetFragment() were added for.

As you can see here there is a very simple way to do that.

In your DialogFragment add an interface listener like:

public interface EditNameDialogListener {
    void onFinishEditDialog(String inputText);
}

Then, add a reference to that listener:

private EditNameDialogListener listener;

This will be used to "activate" the listener method(s), and also to check if the parent Activity/Fragment implements this interface (see below).

In the Activity/FragmentActivity/Fragment that "called" the DialogFragment simply implement this interface.

In your DialogFragment all you need to add at the point where you'd like to dismiss the DialogFragment and return the result is this:

listener.onFinishEditDialog(mEditText.getText().toString());
this.dismiss();

Where mEditText.getText().toString() is what will be passed back to the calling Activity.

Note that if you want to return something else simply change the arguments the listener takes.

Finally, you should check whether the interface was actually implemented by the parent activity/fragment:

@Override
public void onAttach(Context context) {
    super.onAttach(context);
    // Verify that the host activity implements the callback interface
    try {
        // Instantiate the EditNameDialogListener so we can send events to the host
        listener = (EditNameDialogListener) context;
    } catch (ClassCastException e) {
        // The activity doesn't implement the interface, throw exception
        throw new ClassCastException(context.toString()
                + " must implement EditNameDialogListener");
    }
}

This technique is very flexible and allow calling back with the result even if your don;t want to dismiss the dialog just yet.

There is a much simpler way to receive a result from a DialogFragment.

First, in your Activity, Fragment, or FragmentActivity you need to add in the following information:

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    // Stuff to do, dependent on requestCode and resultCode
    if(requestCode == 1) { // 1 is an arbitrary number, can be any int
         // This is the return result of your DialogFragment
         if(resultCode == 1) { // 1 is an arbitrary number, can be any int
              // Now do what you need to do after the dialog dismisses.
         }
     }
}

The requestCode is basically your int label for the DialogFragment you called, I'll show how this works in a second. The resultCode is the code that you send back from the DialogFragment telling your current waiting Activity, Fragment, or FragmentActivity what happened.

The next piece of code to go in is the call to the DialogFragment. An example is here:

DialogFragment dialogFrag = new MyDialogFragment();
// This is the requestCode that you are sending.
dialogFrag.setTargetFragment(this, 1);     
// This is the tag, "dialog" being sent.
dialogFrag.show(getFragmentManager(), "dialog");

With these three lines you are declaring your DialogFragment, setting a requestCode (which will call the onActivityResult(...) once the Dialog is dismissed, and you are then showing the dialog. It's that simple.

Now, in your DialogFragment you need to just add one line directly before the dismiss() so that you send a resultCode back to the onActivityResult().

getTargetFragment().onActivityResult(getTargetRequestCode(), resultCode, getActivity().getIntent());
dismiss();

That's it. Note, the resultCode is defined as int resultCode which I've set to resultCode = 1; in this case.

That's it, you can now send the result of your DialogFragment back to your calling Activity, Fragment, or FragmentActivity.

Also, it looks like this information was posted previously, but there wasn't a sufficient example given so I thought I'd provide more detail.

EDIT 06.24.2016 I apologize for the misleading code above. But you most certainly cannot receive the result back to the activity seeing as the line:

dialogFrag.setTargetFragment(this, 1);

sets a target Fragment and not Activity. So in order to do this you need to use implement an InterfaceCommunicator.

In your DialogFragment set a global variable

public InterfaceCommunicator interfaceCommunicator;

Create a public function to handle it

public interface InterfaceCommunicator {
    void sendRequestCode(int code);
}

Then when you're ready to send the code back to the Activity when the DialogFragment is done running, you simply add the line before you dismiss(); your DialogFragment:

interfaceCommunicator.sendRequestCode(1); // the parameter is any int code you choose.

In your activity now you have to do two things, the first is to remove that one line of code that is no longer applicable:

dialogFrag.setTargetFragment(this, 1);  

Then implement the interface and you're all done. You can do that by adding the following line to the implements clause at the very top of your class:

public class MyClass Activity implements MyDialogFragment.InterfaceCommunicator

And then @Override the function in the activity,

@Override
public void sendRequestCode(int code) {
    // your code here
}

You use this interface method just like you would the onActivityResult() method. Except the interface method is for DialogFragments and the other is for Fragments.

Well its too late may be to answer but here is what i did to get results back from the DialogFragment. very similar to @brandon's answer. Here i am calling DialogFragment from a fragment, just place this code where you are calling your dialog.

FragmentManager fragmentManager = getFragmentManager();
            categoryDialog.setTargetFragment(this,1);
            categoryDialog.show(fragmentManager, "dialog");

where categoryDialog is my DialogFragment which i want to call and after this in your implementation of dialogfragment place this code where you are setting your data in intent. The value of resultCode is 1 you can set it or use system Defined.

            Intent intent = new Intent();
            intent.putExtra("listdata", stringData);
            getTargetFragment().onActivityResult(getTargetRequestCode(), resultCode, intent);
            getDialog().dismiss();

now its time to get back to to the calling fragment and implement this method. check for data validity or result success if you want with resultCode and requestCode in if condition.

 @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);        
        //do what ever you want here, and get the result from intent like below
        String myData = data.getStringExtra("listdata");
Toast.makeText(getActivity(),data.getStringExtra("listdata"),Toast.LENGTH_SHORT).show();
    }

For anyone still reading this: setTargetFragment() has been deprecated. It is now recommended to use the FragmentResultListener API like this:

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setFragmentResultListener("requestKey") { key, bundle ->
        val result = bundle.getString("resultKey")
        // Do something with the result...
    }

    ...

    // Somewhere show your dialog
    MyDialogFragment.newInstance().show(parentFragmentManager, "tag")
}

Then in your MyDialogFragment set the result:

button.setOnClickListener{
    val result = "some string"
    setFragmentResult("requestKey", bundleOf("resultKey" to result))
    dismiss()
}

Different approach, to allow a Fragment to communicate up to its Activity:

1) Define a public interface in the fragment and create a variable for it

public OnFragmentInteractionListener mCallback;

public interface OnFragmentInteractionListener {
    void onFragmentInteraction(int id);
}

2) Cast the activity to the mCallback variable in the fragment

try {
    mCallback = (OnFragmentInteractionListener) getActivity();
} catch (Exception e) {
    Log.d(TAG, e.getMessage());
}

3) Implement the listener in your activity

public class MainActivity extends AppCompatActivity implements DFragment.OnFragmentInteractionListener  {
     //your code here
}

4) Override the OnFragmentInteraction in the activity

@Override
public void onFragmentInteraction(int id) {
    Log.d(TAG, "received from fragment: " + id);
}

More info on it: https://developer.android.com/training/basics/fragments/communicating.html