如何刷新ListView内容的所有时间？

Z时代
2024-01-10
分类：问答

我正在做一个android应用程序，我从数据库everymoment在线的球员。每个球员在ListView中占据一个位置，是一个项目列表。列表刷新如我所料，但是当我点击一个项目列表我的应用程序崩溃。我在android监视器中看到IllegalStateException，我不知道为什么。我认为这是因为我在更改内容和同时按下按钮时使用了listview。可以帮助我某人还是建议其他内容？在下面的代码中，我从数据库中下载数据，然后将其放入列表中。如何刷新ListView内容的所有时间？

public void onclickRefreshfunction() { 
    num = -1; 
    runOnUiThread(new Runnable() { 
     @Override 
     public void run() { 
      if (lock == 1) { 
       lock = 0; 
       ArrayAdapter<String> adapter = new ArrayAdapter<String>(OnLinePlayerActivity.this, 
         android.R.layout.simple_list_item_1, android.R.id.text1, list_of_onlineplayer); 
       adapter.clear(); 
       adapter.notifyDataSetChanged(); 
       list_of_levels.clear(); 
       list_of_onlineplayer.clear(); 
       list_of_usernames.clear(); 
       Response.Listener<String> responseListener = new Response.Listener<String>() { 
        @Override 
        public void onResponse(final String response) { 
         try { 
          JSONObject jsonResponse = new JSONObject(response); 
          JSONArray usernamearray = jsonResponse.getJSONArray("list_of_usernames"); 
          JSONArray levelarray = jsonResponse.getJSONArray("list_of_levels"); 
          for (int i = 0; i < usernamearray.length(); i++) { 
           String name = usernamearray.getString(i); 
           if (name.equals(username)) { 
            num = i; 
            continue; 
           } 
           list_of_usernames.add(name); 
          } 
          for (int i = 0; i < levelarray.length(); i++) { 
           String level = levelarray.getString(i); 
           if (i == num) { 
            continue; 
           } 
           list_of_levels.add(level); 
          } 
          for (int i = 0; i < list_of_usernames.size(); i++) { 
           list_of_onlineplayer.add(" Παίκτης "+list_of_usernames.get(i) + " επίπεδο " + list_of_levels.get(i)); 
          } 
          listView = (ListView) findViewById(R.id.list); 
          ArrayAdapter<String> adapter = new ArrayAdapter<String>(OnLinePlayerActivity.this, 
            android.R.layout.simple_list_item_1, android.R.id.text1, list_of_onlineplayer); 
          listView.setAdapter(adapter); 
          lock = 1; 
         } catch (JSONException e) { 
          e.printStackTrace(); 
         } 
        } 
       }; 
       Response.ErrorListener error = new Response.ErrorListener() { 
        @Override 
        public void onErrorResponse(VolleyError error) { 
         Log.w("error with volley", "error"); 
         onclickRefreshfunction(); 
        } 
       }; 
       OnlineRequest onlineRequest = new OnlineRequest(responseListener , error); 
       // RequestQueue queue = Volley.newRequestQueue(OnLinePlayerActivity.this); 
       // queue.add(onlineRequest); 
       Mysingleton.getmInstance(getApplicationContext()).addToRequestque(onlineRequest); 
      } 
     } 
    }); 
}

下面是Android的显示器

12-03 10:50:46.371 17346-17346/? E/MessageQueue-JNI: 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(2131558534, class android.widget.ListView) with Adapter(class android.widget.ArrayAdapter)] at android.widget.ListView.layoutChildren(ListView.java:1566) at android.widget.AbsListView.onTouchUp(AbsListView.java:4814) at android.widget.AbsListView.onTouchEvent(AbsListView.java:4610) at android.view.View.dispatchTouchEvent(View.java:8135) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2425) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2149) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2295) at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1622) at android.app.Activity.dispatchTouchEvent(Activity.java:2565) at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2243) at android.view.View.dispatchPointerEvent(View.java:8343) at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4769) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4635) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4193) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4247) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4216) at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4327) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4224) at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4384) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4193) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4247) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4216) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4224) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4193) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6567) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6484) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6455) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6420) at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6647) at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java 12-03 10:50:46.381 17346-17346/? E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.sakis.loginregister, PID: 17346 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(2131558534, class android.widget.ListView) with Adapter(class android.widget.ArrayAdapter)] at android.widget.ListView.layoutChildren(ListView.java:1566) at android.widget.AbsListView.onTouchUp(AbsListView.java:4814) at android.widget.AbsListView.onTouchEvent(AbsListView.java:4610) at android.view.View.dispatchTouchEvent(View.java:8135) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2425) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2149) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2431) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2164) at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2295) at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1622) at android.app.Activity.dispatchTouchEvent(Activity.java:2565) at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2243) at android.view.View.dispatchPointerEvent(View.java:8343) at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4769) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4635) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4193) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4247) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4216) at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4327) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4224) at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4384) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4193) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4247) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4216) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4224) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4193) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6567) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6484) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6455) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6420) at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6647) at a at a

我想，也许是至关重要的部分我是不是有问题的消息sure.So我需要你的帮助，以了解如何列表视图的工作。

回答：

首先，你正在被runOnUIThread（），响应听众可能被要求在不同的线程，这取决于你Mysingleton的OnlineRequest分心内runOnUiThread处理程序。其次，您在代码的顶部行创建一个未使用的ArrayAdapter。第三，你不需要每次都创建一个新的ArrayAdapter，只是改变列表内容，并调用notifyDataSetChanged（）

我认为下面的代码应该解决您的问题：

public void onclickRefreshfunction() { 
    num = -1; 
    if (lock == 1) { 
     lock = 0; 
     Response.Listener<String> responseListener = new Response.Listener<String>() { 
      @Override 
      public void onResponse(final String response) { 
       list_of_levels.clear(); 
       list_of_onlineplayer.clear(); 
       list_of_usernames.clear(); 
       try { 
        JSONObject jsonResponse = new JSONObject(response); 
        JSONArray usernamearray = jsonResponse.getJSONArray("list_of_usernames"); 
        JSONArray levelarray = jsonResponse.getJSONArray("list_of_levels"); 
        for (int i = 0; i < usernamearray.length(); i++) { 
         String name = usernamearray.getString(i); 
         if (name.equals(username)) { 
          num = i; 
          continue; 
         } 
         list_of_usernames.add(name); 
        } 
        for (int i = 0; i < levelarray.length(); i++) { 
         String level = levelarray.getString(i); 
         if (i == num) { 
          continue; 
         } 
         list_of_levels.add(level); 
        } 
        for (int i = 0; i < list_of_usernames.size(); i++) { 
         list_of_onlineplayer.add(" Παίκτης "+list_of_usernames.get(i) + " επίπεδο " + list_of_levels.get(i)); 
        } 
        runOnUiThread(new Runnable() { 
         @Override 
         public void run() { 
          listView = (ListView) findViewById(R.id.list); 
          ArrayAdapter<String> adapter = new ArrayAdapter<String>(OnLinePlayerActivity.this, 
            android.R.layout.simple_list_item_1, android.R.id.text1, list_of_onlineplayer); 
          listView.setAdapter(adapter); 
         } 
        }); 
        lock = 1; 
       } catch (JSONException e) { 
        e.printStackTrace(); 
       } 
      } 
     }; 
     Response.ErrorListener error = new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       Log.w("error with volley", "error"); 
       onclickRefreshfunction(); 
      } 
     }; 
     OnlineRequest onlineRequest = new OnlineRequest(responseListener , error); 
     // RequestQueue queue = Volley.newRequestQueue(OnLinePlayerActivity.this); 
     // queue.add(onlineRequest); 
     Mysingleton.getmInstance(getApplicationContext()).addToRequestque(onlineRequest); 
    } 
}