android - 将数据从 BottomSheetDialogFragment 传递或监听到 Fragment

Question

我正在尝试监听或将数据从 BotomSheetDialogFragment 传递到 Fragment 以更改 Fragment 上的某些内容(就像选择器一样)。

我尝试使用 getTargetFragment 来实例化监听器，但遇到编译器错误 Found: 'MyFragment', required: 'android.support.v4.app.Fragment' less..

有什么想法或者我采用了错误的方法吗？

public class MyBottomSheetDialogFragment extends BottomSheetDialogFragment implements View.OnClickListener {


ReportType reportType;

public interface OnChooseReasonListener {
    void onChooseReason(ReportType reportType);
}

OnChooseReasonListener listener;

@Override
public void setupDialog(Dialog dialog, int style) {
    super.setupDialog(dialog, style);
    View contentView = View.inflate(getContext(), R.layout.picker_bottom_sheet_, null);
    dialog.setContentView(contentView);
    CoordinatorLayout.LayoutParams layoutParams =
            (CoordinatorLayout.LayoutParams) ((View) contentView.getParent()).getLayoutParams();
    CoordinatorLayout.Behavior behavior = layoutParams.getBehavior();

    //get null here!!!:
    listener = (OnChooseReasonListener)  getParentFragment();// or with getTargetFragment();
  }

  @Override
public void onClick(View view) {
    switch (view.getId()){
        case R.id.cool_button:
            this.reportType = ReportType.ME;
            //trying to execute the lisstener on null
            listener.onChooseReason(this.reportType);
            dismiss();
            break;
    }
}}

和 fragment :

    public class MyFragment extends Fragment 
  implements View.OnClickListener, 
  MyBottomSheetDialogFragment.OnChooseReasonListener {
//....code here
  public void showPicker() {
        //getting and compiler error Wrong 1st argument type. 
        // picker. setTargetFragment(MyFragment.this , 300);
         picker.show(fm, picker.getTag());
     }
   @Override
    public void onChooseReason(ReportType reportType) {
        //not getting here
        Log(TAG, "You choose something" + reportType.getValue());
    }
}

Answer 1

除了它不起作用之外，该代码还有些味道，因为您将 MyBottomSheetDialogFragment 与创建它的对象耦合在一起。

正确的方法是在 MyBottomSheetDialogFragment 上有一个方法 void setOnChooseReasonListener(OnChooseReasonListener listener) 并在创建实例时调用它。

myBottomSheetDialogFragment.setOnChooseReasonListener(this);