android - Listview fragment 在按下后退按钮时被重新创建

Question

我在我的 ListView fragment 中使用了加载器，它在按下“后退”按钮时重新创建。你能告诉我如何处理这个 senario 吗？

这是我的 ListView fragment 代码。这里我有一个 bool 变量，我在单击列表项时将其设置为 true。但是一旦按下后退按钮，onCreateView 将被调用，因此后退按钮将为 false。

public class GTFragment  extends SherlockFragment implements LoaderCallbacks<Cursor>{

    ListView mTListview = null;
    GoogleTasksAdapter mGTasksAdapter = null;
    private SQLiteCursorLoader mTLoader=null;
    private LoaderManager mTLoaderManager;
    private String mSelectedListID = null; 
    private boolean mIsBackbuttonisPressed = false;

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.task_home_activity, container, false);


    if(!mIsBackbuttonisPressed)
        getLoaderManager().initLoader(0, null, this);

     mTListview   = (ListView) view.findViewById(R.id.id_task_list_home_activity);

     mGTasksAdapter = new GoogleTasksAdapter(getActivity());

     mTListview.setOnItemClickListener(new OnItemClickListener() {

         @Override
         public void onItemClick(AdapterView<?> listview,
            View clickedview, int position, long arg3) {
            // TODO Auto-generated method stub

            GoogleTaskItem item = new GoogleTaskItem();

            Cursor coursor = ((GoogleTasksAdapter)listview.getAdapter()).getCursor();



            if(coursor.moveToPosition(position))
            {


                mIsBackbuttonisPressed = true;
                GoogleTaskController.get_googletask_controllerObj()
                  .LaunchTaskPreviewActivity();                 
            }

        }

    });

   mTListview.setAdapter(mGTasksAdapter);  
   mIsBackbuttonisPressed = false;

   return view;

  }

我的 fragment Activity 类代码

public class TLActivity extends SherlockFragmentActivity {

    LeftSliderTaskListOptions mTaskOptionsFragment = null;
    GoogleTasksFragment mTFragment = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);



        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setHomeButtonEnabled(true);

        setContentView(R.layout.layout_gt_list);


//      FragmentTransaction tfragment = this.getSupportFragmentManager().beginTransaction();
        mTFragment = new GTasksFragment();
        t.replace(R.id.id_tfragment, mTFragment);
        t.commit();


    }

Answer 1

代替

t.replace(R.id.id_tfragment, mTFragment); 

使用

t.add(R.id.id_tfragment, mTFragment); 

对我有用