从 AsyncTask 调用 setAdapter() 时出现 ViewRoot$CalledFromWrongThreadException？

Question

当我从 AsyncTask 的 onPostExecute() 方法调用 listview.setAdapter(adapter); 时出现此错误：

07-12 19:29:38.147: E/AndroidRuntime(8478): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

*注意：此崩溃仅发生在 API 级别 10 中，但不会发生在最新的 API 中（在 API 17 上运行良好）。

这是 onPostExecute()：

@Override
        protected void onPostExecute(String[] result) {
            super.onPostExecute(result);
            // TODO: check this.exception 
            er=result;//er is a global variable
            gff=true;//gff is a global variable
            asynchelp(er);//function in the UI thread
            myPd_ring.dismiss();//dismissing a spinning ring
        }

asynchelp() 如下：

public void asynchelp(String[] er){
        String iamoutofnames[]=null;
        for(int q = 0; q <er.length; q++){
            HashMap<String, String> map = new HashMap<String, String>();
        iamoutofnames=null;
        int len;
        if(er[q].contains("sandy")){
            //calculations
            map.put("col_1", iamoutofnames[len]);
        }else{
            //calculations
        map.put("col_1", iamoutofnames[1]);
            }
        fillMaps.add(map);
        lv.setOnItemClickListener(onListClick);
    }
    SimpleAdapter adapter = new SimpleAdapter(this, fillMaps, R.layout.grid_item, from, to);
    lv.setAdapter(adapter);//CRASHES ON THIS LINE**************

}

代码有什么问题？

编辑：堆栈跟踪：

    07-12 19:29:37.996: W/System.err(8478): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
07-12 19:29:37.996: W/System.err(8478):     at android.view.ViewRoot.checkThread(ViewRoot.java:2932)
07-12 19:29:38.006: W/System.err(8478):     at android.view.ViewRoot.invalidateChild(ViewRoot.java:642)
07-12 19:29:38.006: W/System.err(8478):     at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:668)
07-12 19:29:38.006: W/System.err(8478):     at android.view.ViewGroup.invalidateChild(ViewGroup.java:2511)
07-12 19:29:38.006: W/System.err(8478):     at android.view.View.invalidate(View.java:5279)
07-12 19:29:38.006: W/System.err(8478):     at android.widget.AbsListView.resetList(AbsListView.java:1150)
07-12 19:29:38.006: W/System.err(8478):     at android.widget.ListView.resetList(ListView.java:511)
07-12 19:29:38.006: W/System.err(8478):     at android.widget.ListView.setAdapter(ListView.java:440)
07-12 19:29:38.006: W/System.err(8478):     at com.example.kiva.ListViewA.asynchelp(ListViewA.java:519)
07-12 19:29:38.006: W/System.err(8478):     at com.example.kiva.ListViewA$RetreiveFeedTask.onPostExecute(ListViewA.java:1330)
07-12 19:29:38.006: W/System.err(8478):     at com.example.kiva.ListViewA$RetreiveFeedTask.onPostExecute(ListViewA.java:1)
07-12 19:29:38.006: W/System.err(8478):     at android.os.AsyncTask.finish(AsyncTask.java:417)
07-12 19:29:38.006: W/System.err(8478):     at android.os.AsyncTask.access$300(AsyncTask.java:127)
07-12 19:29:38.006: W/System.err(8478):     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
07-12 19:29:38.016: W/System.err(8478):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-12 19:29:38.016: W/System.err(8478):     at android.os.Looper.loop(Looper.java:130)
07-12 19:29:38.016: W/System.err(8478):     at android.os.HandlerThread.run(HandlerThread.java:60)

07-12 19:29:40.096: W/FlurryAgent(8478): onEndSession called without context from corresponding onStartSession
07-12 19:29:40.206: E/WindowManager(8478): Activity com.example.kiva.ListViewA has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40631600 that was originally added here
07-12 19:29:40.206: E/WindowManager(8478): android.view.WindowLeaked: Activity com.example.kiva.ListViewA has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@40631600 that was originally added here
07-12 19:29:40.206: E/WindowManager(8478):  at android.view.ViewRoot.<init>(ViewRoot.java:258)
07-12 19:29:40.206: E/WindowManager(8478):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
07-12 19:29:40.206: E/WindowManager(8478):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
07-12 19:29:40.206: E/WindowManager(8478):  at android.view.Window$LocalWindowManager.addView(Window.java:424)
07-12 19:29:40.206: E/WindowManager(8478):  at android.app.Dialog.show(Dialog.java:241)
07-12 19:29:40.206: E/WindowManager(8478):  at android.app.ProgressDialog.show(ProgressDialog.java:107)
07-12 19:29:40.206: E/WindowManager(8478):  at android.app.ProgressDialog.show(ProgressDialog.java:90)
07-12 19:29:40.206: E/WindowManager(8478):  at com.example.kiva.ListViewA.topfeeds(ListViewA.java:1598)
07-12 19:29:40.206: E/WindowManager(8478):  at com.example.kiva.ListViewA.onCreate(ListViewA.java:278)
07-12 19:29:40.206: E/WindowManager(8478):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-12 19:29:40.206: E/WindowManager(8478):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
07-12 19:29:40.206: E/WindowManager(8478):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
07-12 19:29:40.206: E/WindowManager(8478):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
07-12 19:29:40.206: E/WindowManager(8478):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
07-12 19:29:40.206: E/WindowManager(8478):  at android.os.Handler.dispatchMessage(Handler.java:99)
07-12 19:29:40.206: E/WindowManager(8478):  at android.os.Looper.loop(Looper.java:130)
07-12 19:29:40.206: E/WindowManager(8478):  at android.app.ActivityThread.main(ActivityThread.java:3683)
07-12 19:29:40.206: E/WindowManager(8478):  at java.lang.reflect.Method.invokeNative(Native Method)
07-12 19:29:40.206: E/WindowManager(8478):  at java.lang.reflect.Method.invoke(Method.java:507)
07-12 19:29:40.206: E/WindowManager(8478):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
07-12 19:29:40.206: E/WindowManager(8478):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
07-12 19:29:40.206: E/WindowManager(8478):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

这是我在asynchelp();中用来解决错误的：

runOnUiThread(new Runnable() {
         public void run() {
    lv.setAdapter(adapter);//lv needs to be declared as final
       }
    });