Activity.runOnUiThread（Runnable action）仅更新视图一次

Posted 2023-01-20

在我的片段中，我有一个AlertDialog和一个蓝牙连接管理器。我想用蓝牙连接过程的新状态更新AlertDialog，所以我使用了runOnUiThread(...)方法：

getActivity().runOnUiThread(new Runnable() 
    @Override
    void run() 
        interactor = new BluetoothInteractor(getActivity(), new OnBluetoothStatusChangedListener() 
            @Override
            public void OnConnectionStopped() 
                alertDialog.setMessage("Disconnected.");
            

            @Override
            public void OnConnectionStopping() 
                alertDialog.setMessage("Stopping connection...");
            

            @Override
            public void OnConnectionStarting() 
                alertDialog.setMessage("Connecting to device...");
            

            @Override
            public void OnConnectionStarted() 
                alertDialog.setMessage("Streaming data...");
            
        );
    
);

我第一次更新AlertDialog消息（OnConnectionStarting事件）一切正常，但第二次我得到android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

这可能发生什么？

答案

用。。。来代替

interactor = new BluetoothInteractor(getActivity(), new OnBluetoothStatusChangedListener() 
       @Override
       public void OnConnectionStopped() 
           getActivity().runOnUiThread(new Runnable() 
               @Override
               void run() 
                   alertDialog.setMessage("Disconnected.");
               
           );
       
       @Override
       public void OnConnectionStopping() 
           getActivity().runOnUiThread(new Runnable() 
               @Override
               void run() 
                   alertDialog.setMessage("Stopping connection...");
               
           );
       
       @Override
       public void OnConnectionStarting() 
           getActivity().runOnUiThread(new Runnable() 
               @Override
               void run() 
                   alertDialog.setMessage("Connecting to device...");
               
           );
       
       @Override
       public void OnConnectionStarted() 
           getActivity().runOnUiThread(new Runnable() 
               @Override
               void run() 
                   alertDialog.setMessage("Streaming data...");
               
           );
       
   );