Question

在我的Android应用中显示以下异常。我正在使用单个列表视图和单个适配器。我正在使用2个不同的回调函数（来自signalr）更新列表视图，但一次只有一个。

异常显示：

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(2131361927, class android.widget.ListView) with Adapter(class com.indus.TAP.PanelDisplay$LogAdaptor)]
08-04 11:42:34.624: E/AndroidRuntime(7133):

代码：

runOnUiThread(new Runnable() {
    @Override
    public void run() {
        LogAdaptor log = (LogAdaptor) lvLog.getAdapter();
        log.notifyDataSetChanged();
        lvLog.post(new Runnable() {
            @Override
            public void run() {
                lvLog.smoothScrollToPosition(lvLog.getCount());
            }
        });
    }
});

Answer 1

有两个要点：

确保在模型更改时调用notifyDataSetChanged方法
如果您在后台线程中更改模型，请使用广播来通知数据更改

Answer 2

如果您的SignalR是一项服务，您可以尝试这样

    @Override
    public void onCreate() {
        super.onCreate();
        mHandler = new Handler(Looper.getMainLooper());
    }

    private startSignalR(...) {
      ...
      mHub.on("broadcastMessage",
                new SubscriptionHandler1<String>() {
                    @Override
                    public void run(final String msg) {
                        ...
                        mHandler.post(new Runnable() {
                            @Override
                            public void run() {
                                // Update adapter and call notifyDataSetChanged here                                 
                            }
                        });
                    }
                }
                , String.class);
      ...
   }

更新：尝试在notifyDataSetChanged之后执行延迟执行，例如：

adapter.notifyDataSetChanged();                    
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
     @Override
     public void run() {
         ...
         ...                            
     }
}, 1000);

java.lang.IllegalStateException：适配器的内容已更改（Signalr）

2 个答案: