Question

我的活动包含两个片段，与同一个班级相关联。

使用上下文菜单，当我从第二个片段/列表视图中选择菜单操作时，记录实例成员会显示仅从第一个片段实例调用onContextItemSelected：

public class LikedFragment extends Fragment {

    @Override public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mMyInstanceId = getArguments().getString("fragmentId"); // "first" or "second"
    }

    @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        mView = inflater.inflate(R.layout.my_fragment, container, false);
        mAdapter = new MyAdapter(mActivity, MyQueries.getMyCursor(mMyInstanceId));

        AbsListView listView = (AbsListView) mView.findViewById(android.R.id.list);
        listView.setAdapter(mAdapter);
        listView.setOnCreateContextMenuListener(this);
        return mView;
    }

    @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        getActivity().getMenuInflater().inflate(R.menu.menu_item_liked, menu);
        Log.d(TAG, mMyInstanceId); // OKAY: logs "second" 
    }

    @Override public boolean onContextItemSelected(MenuItem item) {
        Log.d(TAG, mMyInstanceId); // FAIL: logs "first"
        /* ... */
    }

}

如何在onContextItemSelected中获得正确的实例？

Answer 1

只需使用组ID来解决此问题。只需为片段和片段分配不同的组ID即可。然后在onContextItemSelected中检查它们，如下所示。

public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) 
{
menu.add(GROUP_ID, MENU_1, 0, "Menu 1");
menu.add(GROUP_ID, MENU_2, 0, "Menu 2");
}

public boolean onContextItemSelected(MenuItem item) 
{
//only this fragment's context menus have group ID of -1
if (item.getGroupId() == GROUP_ID) 
{
    //Your Code Will Be Added Here
}

onContextItemSelected片段实例问题

1 个答案: