Question

我有什么

我的应用只有一个活动而其他所有都是碎片其中一个片段显示一个列表视图，该视图通过游标适配器从数据库填充。

我的问题

每次屏幕旋转或按下主页按钮后我返回应用程序，我看到的是我有另一个列表视图位于另一个列表视图上，即另一个列表视图也填充在现有的列表视图上。

这是我的代码

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.tasks_list_frag, container, false);
    Log.d("HirakDebug", "tasksListFrag View Created");
    tasks_Database_Operations tasksDatabaseOperations = new tasks_Database_Operations(getActivity());
    Cursor cursor = tasksDatabaseOperations.readData();
    taskslist = (SwipeListView) view.findViewById(R.id.tasks_list);
    adapter = new tasksCursorAdapter(getActivity(), cursor, CursorAdapter.FLAG_AUTO_REQUERY);
    taskslist.setAdapter(adapter);
    delete = (Button) view.findViewById(R.id.deleteAll);
    delete.setOnClickListener(this);
    taskslist.setSwipeListViewListener(new BaseSwipeListViewListener() {
        @Override
        public void onOpened(int position, boolean toRight) {
        }

        @Override
        public void onClosed(int position, boolean fromRight) {
        }

        @Override
        public void onListChanged() {
        }

        @Override
        public void onMove(int position, float x) {
        }

        @Override
        public void onStartOpen(int position, int action, boolean right) {
            Log.d("swipe", String.format("onStartOpen %d - action %d", position, action));
        }

        @Override
        public void onStartClose(int position, boolean right) {
            Log.d("swipe", String.format("onStartClose %d", position));
        }

        @Override
        public void onClickBackView(int position) {
            Log.d("swipe", String.format("onClickBackView %d", position));
            taskslist.closeAnimate(position);//when you touch back view it will close
        }

        @Override
        public void onDismiss(int[] reverseSortedPositions) {

        }

    });


    taskslist.setSwipeMode(SwipeListView.SWIPE_MODE_RIGHT); // there are five swiping modes
    // there are four swipe actions
    taskslist.setSwipeActionRight(SwipeListView.SWIPE_ACTION_REVEAL);
    taskslist.setOffsetRight(convertDpToPixel(80f)); // right side offset
    taskslist.setAnimationTime(500); // Animation time
    // enable or disable SwipeOpenOnLongPress

    Log.d("HirakDebug", "tasksListFrag Adapter set");

    return view;
}

public int convertDpToPixel(float dp) {
    DisplayMetrics metrics = getResources().getDisplayMetrics();
    float px = dp * (metrics.densityDpi / 160f);
    return (int) px;
}

@Override
public void onResume() {
    super.onResume();
    Log.d("HirakDebug", "taskListFrag resumed");
    getRetainInstance();
}

@Override
public void setRetainInstance(boolean retain) {
    super.setRetainInstance(true);
}

@Override
public void onPause() {
    super.onPause();
    Log.d("LifeCycle", "tLF Pause");
}

@Override
public void onStop() {
    super.onStop();
    Log.d("LifeCycle", "tLF Stop");
}

@Override
public void onDestroyView() {
    super.onDestroyView();
    Log.d("LifeCycle", "tLF DestroyView");
}

@Override
public void onDestroy() {
    super.onDestroy();
    Log.d("LifeCycle", "tLF Destroy");
}

@Override
public void onDetach() {
    super.onDetach();
    Log.d("LifeCycle", "tLF Detach");
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    Log.d("LifeCycle", "tLF Attach");
}

@Override
public void onStart() {
    super.onStart();
    Log.d("LifeCycle", "tLF Start");
}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    Log.d("LifeCycle", "tLF saveInstance State");
}

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

}

@Override
public void onClick(View v) {
    if (v == delete) {
        Log.d("HirakDebug", "Delete Button Pressed");
        tasks_Database_Operations tasksDatabaseOperations = new tasks_Database_Operations(getActivity());
        SQLiteDatabase sqLiteDatabase = tasksDatabaseOperations.getWritableDatabase();
        sqLiteDatabase.delete(tasksDatabaseOperations.ASSIS_TASK_TABLE_NAME, null, null);
        Log.d("HirakDebug", "tLF All Data Deleted");
        adapter.notifyDataSetChanged();
        Log.d("HirakDebug", "tLF ArrayList Cleared");
        sqLiteDatabase.close();
    }

}

Answer 1

只需检查您的活动onCreate方法

if (saveInstance == null) {
  mFragment = new Fragment();
  fm.beginTransaction().replace(mFragment, TAG_TASK_FRAGMENT).commit();
}

Listview显示奇怪的行为

1 个答案: