android-listView-适配器的内容已更改，但listView未收到通知

这是我的适配器，我通过json从服务器获取数据，然后使用BaseAdapter填充我的ListView。创建一个包含30行的listview，当用户到达listview的末尾时，GetContacts再次调用，另外30个项目将添加到listview

代码如下：

ListAdapter ladap;

private class GetContacts AsyncTask<Void, Void,ArrayList<HashMap<String, String>>> {    
@Override
protected Void doInBackground(Void... arg0) {
    Spots_tab1_json sh = new Spots_tab1_json();
    String jsonStr = sh.makeServiceCall(url + page, Spots_tab1_json.GET);

    ArrayList<HashMap<String, String>> dataC = new ArrayList<HashMap<String, String>>();

    if (jsonStr != null) {
        try {
            JSONObject jsonObj = new JSONObject(jsonStr);
            contacts = jsonObj.getJSONArray(TAG_CONTACTS);

                for (int i = 0; i < contacts.length(); i++) {
                JSONObject c = contacts.getJSONObject(i);
                String id = new String(c.getString("id").getBytes("ISO-8859-1"), "UTF-8");
                String dates = new String(c.getString("dates").getBytes("ISO-8859-1"), "UTF-8");
                String price = new String(c.getString("gheymat").getBytes("ISO-8859-1"), "UTF-8");
                HashMap<String, String> contact = new HashMap<String, String>();
                contact.put("id", id);
                contact.put("dates", dates);
                contact.put("price", price);
                dataC.add(contact);
            }
            }
        } catch (JSONException e) {
            goterr = true;
        } catch (UnsupportedEncodingException e) {
            goterr = true;
        }
    } else {
        goterr = true;
    }
    return dataC;
}

@Override
protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
    super.onPostExecute(result);
    if (!isCancelled() && goterr == false) {
        if(ladap==null){
            ladap=new ListAdapter(MainActivity.this,result);
            lv.setAdapter(ladap);
        }else{
            ladap.addAll(result);
        }

}

第二点：

STACK_TRACE = 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. [in ListView(2131034188, class android.widget.ListView) with Adapter(class ir.klach.persiandesigners.MainActivity$ListAdapter)]
at android.widget.ListView.layoutChildren(ListView.java:1551)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:4498)
at android.view.View.dispatchTouchEvent(View.java:7669)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2395)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2284)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1578)
at android.app.Activity.dispatchTouchEvent(Activity.java:2468)
at android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.dispatchTouchEvent(ActionBarActivityDelegateICS.java:268)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2232)
at android.view.View.dispatchPointerEvent(View.java:7876)
at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3894)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3778)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5030)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5009)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5107)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:125)
at android.os.Looper.loop(Looper.java:124)
at android.app.ActivityThread.main(ActivityThread.java:5283)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)

PHONE_MODEL = GT-I9082
APP_VERSION_NAME = 2.7
ANDROID_VERSION = 4.2.2

---

你能帮我解决这个问题吗

尝试向列表适配器数据持有者添加新数据，而不是将新数据分配给列表适配器数据持有者：

public void addAll(ArrayList<HashMap<String, String>> result) {
    Log.v("this",result.size()+" resultsize");
    if(this.list == null){
       this.list = result;
    }else{
       this.list.addAll(result);
    }
    notifyDataSetChanged();
}

public void addAll（ArrayList结果）{
Log.v（“this”，result.size（）+“resultsize”）；
if（this.list==null）{
this.list=结果；
}否则{
this.list.addAll（结果）；
}
notifyDataSetChanged（）；
}

尽管OppositeExecute可以在UI线程本身上工作。但是你仍然面临着这个问题，尝试一下下面的方法

context.runOnUiThread(new Runnable()
   {
        @override
        public void run()
       {
           list.addAll(result);
           notifyDataSetChanged();
       }
  });

---

Hop它对您有效。

正如您的逻辑所说，“确保适配器的内容不是从后台线程修改的，而是从UI线程修改的”@shayanpourvatan我确定，它在postExceute上运行，因此它在UI线程上运行

public void addAll(ArrayList<HashMap<String, String>> result) {
    Log.v("this",result.size()+" resultsize");
    if(this.list == null){
       this.list = result;
    }else{
       this.list.addAll(result);
    }
    notifyDataSetChanged();
}

context.runOnUiThread(new Runnable()
   {
        @override
        public void run()
       {
           list.addAll(result);
           notifyDataSetChanged();
       }
  });