通过 class 对象在列表中动态插入项目

Question

我正在使用 class 对象在列表视图中添加带有事件名称、开始和时间的生活事件，但仍然没有成功；我搜索了很多但找不到相关答案。我是初学者希望你能帮助我谢谢

public class MeetingFragment extends Fragment {

    List<Meetings> meetingList; //here Meetings is a Class
    Meetings newMeeting;
    ListView listView;
    String meetingTag;
    String[] meetings;
    ArrayAdapter<Meetings> adapter;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View rootView = inflater.inflate(R.layout.fragment_meeting, container,
            false);

    newMeeting = new Meetings();
    listView = (ListView) rootView.findViewById(R.id.list_meetings);

    meetings = new String[] {};
    adapter = new ArrayAdapter<Meetings>(getActivity(), R.layout.list_item,
            R.id.meeting_name);
    listView.setAdapter(adapter);

    });

//This is custom dialog
ok.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            String tagMeeting = et.getText().toString();
            String startTimeStr = strtTime.getText().toString();
            String endTimeStr = endTime.getText().toString();

            newMeeting.setMeetingName(tagMeeting);
            newMeeting.setStartTime(startTimeStr);
            newMeeting.setEndTime(endTimeStr);

            //Display error on below line 
            meetingList.add(newMeeting);  
            addMeeting.dismiss();
        }

    });

Answer 1

我没有看到 where/how 您正在将支持 ListView 的数据传递给 ArrayAdapter。当您将数据传递给适配器时，您需要获取它的引用、添加新项目并在 ArrayAdapter 上调用 notifyDataSetChanged()。

Answer 2

每当您对数组列表进行更改时，调用 notifydatasetchanged 它将为您处理

ok.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        String tagMeeting = et.getText().toString();
        String startTimeStr = strtTime.getText().toString();
        String endTimeStr = endTime.getText().toString();

        newMeeting.setMeetingName(tagMeeting);
        newMeeting.setStartTime(startTimeStr);
        newMeeting.setEndTime(endTimeStr);

        //Display error on below line 
        meetingList.add(newMeeting);  
        adapter.notifyDataSetChanged();
        addMeeting.dismiss();
    }

});

如果这不起作用，请显示 logcat

通过 class 对象在列表中动态插入项目

Inserting items in a list dynamically by class object

android

android-listview

android-listfragment