android - Return values from DialogFragment

Question

I am doing task in which I need to show a dialog after clicking on EditText. In that dialog I show contents with RadioButtons using RecyclerView.

Now, what I want to do is, after selecting RadioButton (content which is in the RecyclerView) from dialog, it should return value of that content and then dialog should be dismissed.

To generate a dialog I've used a DialogFragment.

As I'm new in android development, I am totally confused and unable to find the solution.

Answer 1

Because your dialog is a DialogFragment you can use two things

1. If you are starting the dialog from a Activity, you can use an interface

• create an interface

  public interface ISelectedData {
      void onSelectedData(String string);
  }
  

• implement an interface in your Activity

  public class MyActivity implements ISelectedData {
  
      .....
  
      @Override 
      public void onSelectedData(String myValue) {
          // Use the returned value
      }
  }
  

• in your Dialog, attach the interface to your Activity

  private ISelectedData mCallback;
  
  @Override
  public void onAttach(Activity activity) {
      super.onAttach(activity);
  
      try {
          mCallback = (ISelectedData) activity;
      }
      catch (ClassCastException e) {
          Log.d("MyDialog", "Activity doesn't implement the ISelectedData interface");
      }
  }
  

• when returning the value to Activity, just call in your Dialog

  mCallback.onSelectedData("myValue");
  

  Check the example on the Android developer site.

2. If you are starting the dialog from a Fragment, you can use setTargetFragment(...)

• starting the Dialog

  MyDialog dialog = new MyDialog();
  dialog.setTargetFragment(this, Constants.DIALOG_REQUEST_CODE);
  dialog.show(fragmentManager, Constants.DIALOG);
  

• returning the value from the Dialog

  Bundle bundle = new Bundle();
  bundle.putString(Constants.MY_VALUE, "MyValue");
  
  Intent intent = new Intent().putExtras(bundle);
  
  getTargetFragment().onActivityResult(getTargetRequestCode(), Activity.RESULT_OK, intent);
  
  dismiss();
  

• getting the value in Fragment

  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent data) {
      super.onActivityResult(requestCode, resultCode, data);
  
      if (requestCode == Constants.DIALOG_REQUEST_CODE) {
  
          if (resultCode == Activity.RESULT_OK) {
  
              if (data.getExtras().containsKey(Constants.MY_VALUE)) {
  
                  String myValue = data.getExtras().getString(Constants.MY_VALUE);
  
                  // Use the returned value
              }
          }
      }
  }