FragmentA啟動FragmentB,做一些選擇操作後，返回FragmentA，需要把FragmentB裡面選擇的資料傳回來。有什麼辦法？

Fragment之間不能直接通訊，必須通過Activity來完成，具體步驟。

1. 在FragmentA中定義通訊介面，通過該介面向Activity傳送資料。

public class FragmentA extends Fragment {
    private onButtonPressListener mListener;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view 
 
= inflater.inflate(R.layout.fragment_linmo_select_beitie, container, false);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                mListener.onOKButtonPressed(selectedBeitie);
            }
        });

        
 
return view;
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (onButtonPressListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString() + " must implement onOkButtonPressed");
        }
    }

    
 
public interface onButtonPressListener {
        void onOKButtonPressed(LinmoBeitieItem item);
    }
}

2. 在Activity中實現該介面，並通過該介面向FragmentB傳遞資料。

public class MainActivity extends Activity implements FragmentA.onButtonPressListener {
    @Override
    public void onOKButtonPressed(LinmoBeitieItem item) {
        FragmentB fragmentB = （FragmentB）getFragmentManager().findFragmentById(R.id.container);
        fragmentB.onBeitieSelected(item);
    }
}

3. FragmentB接收到資料並處理。

public class FragmentB extends Fragment {
    public void onBeitieSelected(LinmoBeitieItem item) {
        // ...
    }
}

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