Android AsyncTask和IllegalArgumentException
在我正在开发的应用程序中,当我触摸设备的屏幕时,我连接到服务器,并使用AsyncTask显示忙指示灯,在这一步中,我没有 问题但是,当我连接并按下主页按钮“应用程序进入暂停”时,我会将应用程序再次显示为“恢复”并触摸屏幕 为了再次连接到服务器,我收到下面发布的logCat错误 注意:在onPause中,我注册了WiFi接收器,并断开了与服务器的连接。logCat输出显示了异步任务调用回调的顺序 我不知道为什么我会收到IllegalArgumentException,我读了一些关于它的帖子,我测试了一个名为“client”的对象,它从来都不是空的 LogCat:Android AsyncTask和IllegalArgumentException,android,android-asynctask,mqtt,Android,Android Asynctask,Mqtt,在我正在开发的应用程序中,当我触摸设备的屏幕时,我连接到服务器,并使用AsyncTask显示忙指示灯,在这一步中,我没有 问题但是,当我连接并按下主页按钮“应用程序进入暂停”时,我会将应用程序再次显示为“恢复”并触摸屏幕 为了再次连接到服务器,我收到下面发布的logCat错误 注意:在onPause中,我注册了WiFi接收器,并断开了与服务器的连接。logCat输出显示了异步任务调用回调的顺序 我不知道为什么我会收到IllegalArgumentException,我读了一些关于它的帖子,我测试
03-09 14:26:13.413: D/MainActivity(17065): @MQTTAsynchTask(): constructor called
03-09 14:26:13.413: D/MainActivity(17065): @MQTTAsynchTask(): client is not null
03-09 14:26:13.413: D/MainActivity(17065): @MQTTAsynchTask(): onPreExecute().
03-09 14:26:13.422: D/MainActivity(17065): @MQTTAsynchTask(): doInBackground().
03-09 14:26:13.433: E/AndroidRuntime(17065): FATAL EXCEPTION: pool-1-thread-1
03-09 14:26:13.433: E/AndroidRuntime(17065): Process: com.example.mqtt_designlayout_02, PID: 17065
03-09 14:26:13.433: E/AndroidRuntime(17065): java.lang.IllegalArgumentException: Invalid ClientHandle
03-09 14:26:13.433: E/AndroidRuntime(17065): at org.eclipse.paho.android.service.MqttService.getConnection(MqttService.java:552)
03-09 14:26:13.433: E/AndroidRuntime(17065): at org.eclipse.paho.android.service.MqttService.connect(MqttService.java:318)
03-09 14:26:13.433: E/AndroidRuntime(17065): at org.eclipse.paho.android.service.MqttAndroidClient.doConnect(MqttAndroidClient.java:427)
03-09 14:26:13.433: E/AndroidRuntime(17065): at org.eclipse.paho.android.service.MqttAndroidClient.access$2(MqttAndroidClient.java:417)
03-09 14:26:13.433: E/AndroidRuntime(17065): at org.eclipse.paho.android.service.MqttAndroidClient$1.run(MqttAndroidClient.java:395)
03-09 14:26:13.433: E/AndroidRuntime(17065): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-09 14:26:13.433: E/AndroidRuntime(17065): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-09 14:26:13.433: E/AndroidRuntime(17065): at java.lang.Thread.run(Thread.java:818)
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Log.w(TAG, "@onPause()");
this.onPauseCalled = true;
if (reconnectTimerCurrentlyActive) {
reconnectTimerCurrentlyActive = false;
reconnectTimer.cancel();
reconnectTimer.purge();
Log.v(TAG, "reconnect timer set to 'false', and reconnectTimer is cancelled");
}
if (this.MQTTAsynch != null) {
Log.d(TAG, "asynchTask object was initilised");
if (this.MQTTAsynch.getStatus() == AsyncTask.Status.PENDING) {
Log.d(TAG, "AsynchTask has not started yet.");
boolean cancelledSuccessully = this.MQTTAsynch.cancel(true);
if (cancelledSuccessully) {
Log.d(TAG, "AsynchTask is cancelled successfully.");
} else {
Log.d(TAG, "AsynchTask failed to cancell");
}
}
if (this.MQTTAsynch.getStatus() == AsyncTask.Status.RUNNING) {
Log.d(TAG, "AsynchTask still running doing work in the backgroung thread, and it will be intrrupted");
boolean cancelledSuccessully = this.MQTTAsynch.cancel(true);
if (cancelledSuccessully) {
Log.d(TAG, "AsynchTask is cancelled successfully.");
} else {
Log.d(TAG, "AsynchTask failed to cancell");
}
}
if (this.MQTTAsynch.getStatus() == AsyncTask.Status.FINISHED) {
Log.d(TAG, "AsynchTask has finished its work.");
}
} else {
Log.d(TAG, "asynchTask object was not initilised. this.MQTTAsynch == null");
}
if ( (this.subActivityReturned) || (this.isConnectCalled) ) {
MQTT_Disconnect_Module();
}
if (MQTTPrimaryReceiverRegistered) {
unregisterReceiver(MQTTPrimaryReceiver);
Log.v(TAG, "BroadCastReceiver (MQTTPrimaryReceiver) unregistered");
MQTTPrimaryReceiverRegistered = false;
}
}
异步任务
public MQTTAsynchTask(Context contex, MqttAndroidClient client, MqttConnectOptions opts) {
// TODO Auto-generated constructor stub
Log.d(TAG, "@MQTTAsynchTask(): constructor called");
this.context = contex;
this.MQTTAndroidClient = client;
if (client != null) {
Log.d(TAG, "@MQTTAsynchTask(): client is not null");
}
this.opts = opts;
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
Log.d(TAG, "@MQTTAsynchTask(): onPreExecute().");
dialog = new Dialog(this.context);
dialog.setCancelable(false);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.progressdialog);
progressBar = (ProgressBar) dialog.findViewById(R.id.progressBar1);
dialog.show();
}
@Override
protected Void doInBackground(Void... params) {
// TODO Auto-generated method stub
Log.d(TAG, "@MQTTAsynchTask(): doInBackground().");
do {
try {
this.MQTTAndroidClient.connect(this.opts, this.context, synchCONNCallBack);
} catch (MqttSecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MqttException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
Thread.sleep(MQTT_BROKER_TIME_OUT);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
this.totalTimeOut += MQTT_BROKER_TIME_OUT;
} while ( (!this.isCancelled()) && (this.MQTTAndroidClient != null) && (!this.MQTTAndroidClient.isConnected()) && (this.totalTimeOut <= (10 * MQTT_BROKER_TIME_OUT)) );
return null;
}
我认为从中学习的第一件事是完全阅读错误日志并理解它。堆栈跟踪的第一行说
03-09 14:26:13.433: E/AndroidRuntime(17065): java.lang.IllegalArgumentException: Invalid ClientHandle
03-09 14:26:13.433: E/AndroidRuntime(17065): at org.eclipse.paho.android.service.MqttService.getConnection(MqttService.java:552)
i、 e错误从方法getConnection()
中的MqttService
类开始。方法getConnection()
正在抛出IllegalArgumentException
,而不是AsyncTask
。它恰好是从内部调用的AsyncTask
。另外,变量ClientHandle不是Android API的一部分,它是MqttService
的一部分。此变量实际上无效,并导致异常
如果无法找出变量
ClientHandle
无效的原因,也可以共享MqttService
类。也许这里的人可以在这方面帮助你,但根据提供的信息,这就是我可以回答的。希望这有帮助。您找到解决方案了吗?问题既不是您的客户端也不是NullPointerException(客户端为null),错误开始于此类:MqttService,在第552行,并在MqttAndroidClient上继续。我建议你检查一下out@rmaik. 我也面临同样的问题,你有没有找到解决办法?