我有一个列表视图,显示打开的片段何时被保存的列表更新。最初该列表是空的,因此它吐出错误java.lang.IndexOutOfBoundsException:索引0无效,大小为0.所以我想显示类似文本的东西,表示像空的东西,这样当列表中有东西时它会显示。我尝试过使用getEmptyView但无济于事。我可以请一些帮助来解决这个问题。
@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;
}
答案 0 :(得分:1)
这样的东西?
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
}
答案 1 :(得分:1)
我希望您查看此帖setEmptyView on ListView not showing its view in a android app,它应解决您的空视图问题。
如果您想阻止应用程序抛出IndexOutOfBoundsException,您可以在设置适配器之前检查dataModels
数组的大小。
if (dataModels.size() > 0)
{
//Setup our adapter here
}
希望这会有所帮助:)
答案 2 :(得分:1)
我在我的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将自动设置数据文本。