java在listview为空时显示内容

Question

我有一个listview，当一个片段被保存的列表更新时，它会显示出来。最初，该列表是空的，因此会抛出一个错误。lang.IndexOutOfBoundsException:索引0无效，大小为0。所以我想显示一些东西，比如一个文本，说一些空的东西，这样当列表中有东西时，它就会显示出来。我尝试过使用getEmptyView，但没有效果。我能得到一些关于如何完成这项任务的帮助吗？谢谢

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

    View customView = inflater.inflate(R.layout.fragment_reading_monday, container, false);

    addNewButton = (Button) customView.findViewById(R.id.btnAddNewReadingMonday);
    relativeLayoutMonday = (RelativeLayout) customView.findViewById(R.id.frameLayoutMonday);
    listViewMonday = (ListView)customView.findViewById(R.id.listViewMonday);
    listContainerMonday = (RelativeLayout)customView.findViewById(R.id.listContainerMonday);
    tinyDB = new TinyDB(getContext());
    addNewSubject = (Button)customView.findViewById(R.id.btnAddNewSubjectMonday);
    dataModels = new ArrayList<>();
    arrayListSubjectsRead = new ArrayList<>();
    timeOne = new ArrayList<>();
    timeTwo = new ArrayList<>();
    adapter = new CustomListAdapterReading(getContext(), dataModels);

        TextView empty = (TextView) customView.findViewById(R.id.emptyTextView);
        listViewMonday.setEmptyView(empty);


            arrayListSubjectsRead =  tinyDB.getListString("ArrayForSubjects");
            timeOne = tinyDB.getListString("ArrayForTimeOne");
            timeTwo = tinyDB.getListString("ArrayForTimeTwo");

            dataModels.add(new DataModelReading(arrayListSubjectsRead, timeOne, timeTwo));

            adapter = new CustomListAdapterReading(getContext(), dataModels);
            listViewMonday.setAdapter(adapter);
            adapter.notifyDataSetChanged();

            System.out.println(" subjects: "+arrayListSubjectsRead);
            System.out.println("timeone: "+ timeOne);
            System.out.println("timetwo: "+timeTwo);









    addNewButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            relativeLayoutMonday.removeView(noEventTextView);
            Intent intent = new Intent(getActivity(),ReadMain.class);
            startActivity(intent);

        }
    });

    addNewSubject.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

        }
    });




    return customView;
}

Answer 1

像这样的

ImageListAdapter imageListAdapter= new ImageListAdapter();
listviewObject.setAdapter(imageListAdapter);

if (imageListAdapter!= null)
    if (imageListAdapter.getCount() > 0){
        // implement your work
    }else {
        // do whatever you want on empty list adapter 
    }

Answer 2

我在应用程序中使用这种方式

ListView listView = (ListView)findViewById(android.R.id.listView);
TextView noData = (TextView)findViewById(android.R.id.noData);
listView.setEmptyView(noData);

当适配器为空时，Listview将自动设置无数据文本