兩個Fragment之間如何傳遞資料
阿新 • • 發佈:2018-12-30
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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