Question

我通过SO搜索了很多，有几个主题正在谈论这个问题。但实际上没有人帮忙，我已经用数据填充了适配器，现在我想删除每行中带有专用按钮的行，其中一个线程有一个建议：写一个onClickListener in适配器的getView()方法。当我尝试这样做时，出现了IndexOutOfBound异常。更准确地说，当我单击第一行上的删除按钮时，没有任何反应，但在第二行和最后一行中单击删除按钮会出现异常

这是我试图做的事情，Android工作室建议职位变量应该是最终的：

public class TimeTrackerAdapter extends BaseAdapter {
    public ArrayList<TimeRecord> times=new ArrayList<TimeRecord>();
    @Override
    public int getCount() {
        return times.size();
    }

    public TimeTrackerAdapter()
    {
        times.add(new TimeRecord("12:30","this is the best"));
        times.add(new TimeRecord("2:30","I need this"));
    }
    @Override
    public Object getItem(int position) {
        return times.get(position);
    }

    public void addTimeRecord(TimeRecord timeRecord)
    {
        times.add(timeRecord);
    }
    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View view, ViewGroup parent) {
        if(view==null) {
            LayoutInflater inflater = LayoutInflater.from(parent.getContext());
            view = inflater.inflate(R.layout.menu_layout, parent, false);
        }
        Button button=(Button) view.findViewById(R.id.delete_entry);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                times.remove(position);
            }
        });
        TextView timeView=(TextView) view.findViewById(R.id.time_textView);
        TextView noteView=(TextView) view.findViewById(R.id.note_TextView);
        TimeRecord time=times.get(position);
        timeView.setText(time.getTime());
        noteView.setText(time.getNote());
        return view;
    }
}

这里是错误堆栈：

08-21 10:47:20.330  20400-20400/com.example.sam.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.sam.myapplication, PID: 20400
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
        at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
        at java.util.ArrayList.remove(ArrayList.java:403)
        at com.example.sam.myapplication.TimeTrackerAdapter$1.onClick(TimeTrackerAdapter.java:55)
        at android.view.View.performClick(View.java:4508)
        at android.view.View$PerformClick.run(View.java:18675)
        at android.os.Handler.handleCallback(Handler.java:733)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5584)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1268)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084)
        at dalvik.system.NativeStart.main(Native Method)

Answer 1

您需要在按钮onClick方法

中添加notifyDataSetChanged（）

       Button button=(Button) view.findViewById(R.id.delete_entry);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                times.remove(position);
                notifyDataSetChanged();
            }
        });

Answer 2

每当添加/删除项目时都应该调用notifyDataSetChanged。这里的片段

$scope.getCount = function(field, value){
    var obj = {};
    obj[field] = value;
    return _.where($scope.players, obj).length;
};

删除ListView中的行，IndexOutOfBound异常

2 个答案: