Android Studio Fragment RoomListFragment 未附加到 Activity（在导航抽屉中启动新活动）

Question

我在打开类 RoomListFragment 的新活动时遇到问题。我使用导航抽屉。

这是我的 RoomListFragment.class

public class RoomListFragment extends Fragment {
private View root;

public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    root = inflater.inflate(R.layout.fragment_rooms, container, false);

    ListView listView = root.findViewById(R.id.listView);

    RoomListAdapter adapter = new RoomListAdapter(root.getContext(),mTitle,mDescription);

    listView.setAdapter(adapter);

    return root;
}

void startRoomEditManagerActivity(Context context) {
    Intent intent = new Intent(context, RoomEditManager.class);
    startActivity(intent);
}

}

还有我的第二堂课，我有一个按钮，其中有一个我激活的函数 startRoomEditManagerActivity

   RoomListAdapter(Context roomListContext, String[] roomListName, String[] roomListDescription) {
    super(roomListContext, R.layout.row, R.id.testTextView1, roomListName);
    this.roomListName = roomListName;
    this.roomListDescription = roomListDescription;
    this.contextRoomList = roomListContext;
}
        @Override
        public void onClick(View v) {
            editRoomButton.setText(roomListName[position]);

            Toast.makeText(getContext(), roomListName[position] +" id : " + String.valueOf(editRoomButton.getId()),Toast.LENGTH_SHORT).show();

            RoomListFragment roomlistFragment = new RoomListFragment();
            roomlistFragment.startRoomEditManagerActivity(contextRoomList);

        }

感谢帮助^^

Answer 1

将 onclick 替换为

 @Override
        public void onClick(View v) {
            editRoomButton.setText(roomListName[position]);

            Toast.makeText(getContext(), roomListName[position] +" id : " + String.valueOf(editRoomButton.getId()),Toast.LENGTH_SHORT).show();

Intent intent = new Intent(contextRoomList , RoomEditManager.class);
    contextRoomList.startActivity(intent);

        }

那么，在你的 roomlistFragment 中，你不需要下面的代码

void startRoomEditManagerActivity(Context context) {
    Intent intent = new Intent(context, RoomEditManager.class);
    contextRoomList.startActivity(intent);
}