Question

我有这个listview更新：

timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {     
display.elemek.clear();                     
em1.new AsyncEmBase().execute();

}
}, 0, 1000);
public class AsyncEmBase extends AsyncTask<Void, ListView, Void> {

        protected void onPreExecute() {
            // display.dataAdapter.clear();
        }

        @Override
        protected Void doInBackground(Void... params) {

readInputRegisters();  /*this only makes display.elemek.add("SomeString")*/


            return null;
        }

        protected void onPostExecute(Void unsed) {
            if (display.dataAdapter == null) {
            display.dataAdapter = new ArrayAdapter<String>(
                    display.activity, android.R.layout.simple_list_item_1,
                    display.elemek);

            display.lv.setAdapter(display.dataAdapter);
        } else {
            display.dataAdapter.notifyDataSetChanged();
        }

        }

    }

它顺利运行但过了一会儿就停下来说：

11-27 15:21:05.769: E/AndroidRuntime(17991): java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. Make sure your adapter calls notifyDataSetChanged() when its content changes. [in ListView(2131296261, class android.widget.ListView) with Adapter(class android.widget.ArrayAdapter)]

我尝试过更新listview，但没有什么是好的。请帮帮我！

edit1：新错误：索引7无效，大小为0 但是我在开始插入数据之前清除了elemek arraylist

display.java：

public class display extends Fragment {

    public static TextView ain1, ain2, ain3, ain4, dout1, dout2, din1, din2,
            din3, din4, cin1, cin2, cin3, cin4, k1, k2, k3, k4, k5, k6, k7, k8;
    public static Activity activity;
    public static ListView lv;
    public static ArrayList<String> elemek;
    public static ArrayAdapter<String> dataAdapter;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.display, container, false);



        ain1 = (TextView) rootView.findViewById(R.id.textView2);

        activity = getActivity();

        lv = (ListView) rootView.findViewById(R.id.listView1);      
        elemek = new ArrayList<String>();

        return rootView;
    }

Answer 1

display.activity.runOnUiThread(...)没用，因为onPostExecute()已经在UI线程

中执行了

我认为您不必调用notifyDataSetChanged()，因为您之前正在设置适配器。

Answer 2

删除所有的线程，因为你在onPostExecute（）中不需要ui线程并添加如下：

if ( display.dataAdapter == null) {
        display.dataAdapter = new ArrayAdapter<String>(
                display.activity,
                android.R.layout.simple_list_item_1, display.elemek);

        display.lv.setAdapter(display.dataAdapter);
}else{
        display.dataAdapter.notifyDataSetChanged(); 
}

Listview更新中的错误始终停止

2 个答案: