从Activity或Fragment打开的DialogFragment？

Question

I want to detect whether the DialogFragment is opened from an Activity or Fragment. Because the calling Activity or Fragment will have an Interface attached for a listener.

if Activity is used to show the dialog: (inside DialogFragment I will write)

listener = (MyListener) getActivity();

else if Fragment is calling the dialog:

listener = (MyListener) getParentFragment;

So, I need to detect who is calling the dialog fragment!

Answer 1

If you ask me to edit your code then do this.

void showDialog() {
    DialogFragment newFragment = new MyAlertDialogFragment();
    newFragment.setFromActivity(true); pass here.
    newFragment.show(getFragmentManager(), "dialog");
}

In your DialogFragment

public static class MyAlertDialogFragment extends DialogFragment {
   boolean isFromActivity;
   public void setFromActivity(boolean isFromActivity){
    this.isFromActivity = isFromActivity;
   }
}

If you ask me a suggestion - Pass listener instead of checking from Activity or Fragment.

You should do common code by using setters, so that in future you can just pass listener.

DialogFragment newFragment = new MyAlertDialogFragment();
newFragment.setListener(this); // or use anonymous deriving like new Listener()...

Answer 2

I am using the below style for my question, posting as an answer because it might help someone.

public MyDialog extends DialogFragment{
    private MyListener listener;

    public static MyDialog newInstance(MyListener callback){
        MyDialog dialog = new MyDialog();
        dialog.listener = callback;
        return dialog;
    }

    //rest of the Dialog code such as onCreate() etc..

}

And calling from Any Activity or Fragment

ACTIVITY

public MyActivity extends AppCompatActivity implements MyListener{

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.my_layout);

    MyDialog dialog = MyDialog.newInstance(this);
    dialog.show(getSupportFragmentManager, "TAG");
    }

}

FRAGMENT

public MyFragment extends Fragment implements MyListener{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.my_frag_layout, container, false);

    MyDialog dialog = MyDialog.newInstance(this);
    dialog.show(getChildFragmentManager, "TAG"); 

    return view;
}

}

Please comment if there is any possiblity of error or conditions where it can crash. Thank you!