无法从片段内的接口获取数据

Question

I have implemented a custom interface for passing data like below:

public interface OnLectureSelected {
    public void lectureSelected(String videoId,String lectureDescription);
}

in the adapter, I am then using the interface to pass data to the activity & the fragment:

OnLectureSelected onLectureSelected2 = (OnLectureSelected) context;
onLectureSelected2.lectureSelected(video,description);

The activity is able to receive the data as expected:

class Activity extends AppCompatActivity implements OnLectureSelected{
  …
 @Override
 public void lectureSelected(String videoId, String lectureDescription) {
  //I get the passed details
 }

However, I am unable to get the data using a fragment:

class Fragment extends Fragment implements OnLectureSelected{
  …
 @Override
 public void lectureSelected(String videoId, String lectureDescription) {
  //Can't get the passed details
 }

What is the best approach to get the data from the interface inside the fragment?

Answer 1

OnLectureSelected onLectureSelected2 = (OnLectureSelected) context;

Here this object will pass the value to only one implemented class. To pass the value to fragments you can call the below method in your Activity class

@Override
    public void lectureSelected(String videoId, String lectureDescription) {
        //Can't get the passed details
        List<Fragment> fragments = getSupportFragmentManager().getFragments();
        if (fragments != null) {
            for (Fragment fragment : fragments) {
                if(fragment instanceof FragmentClasas) {
                    fragment.lectureSelected(video,description);
                }
            }
        }
    }