java - 无法从 fragment 内的接口(interface)获取数据

Question

我已经实现了一个自定义接口(interface)来传递数据，如下所示:

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

在适配器中，我然后使用接口(interface)将数据传递给 Activity 和 fragment :

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

Activity 能够按预期接收数据:

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

但是，我无法使用 fragment 获取数据:

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

从 fragment 内的界面获取数据的最佳方法是什么？

Answer 1

OnLectureSelected onLectureSelected2 = (OnLectureSelected) context;

这里该对象将仅将值传递给一个已实现的类。要将值传递给 fragment ，您可以在 Activity 类中调用以下方法

@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);
                }
            }
        }
    }