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显示忙碌的指示器,并且在此步骤中我没有
问题.但是当我连接并按下home buttom“应用程序进入onPause”并且我将应用程序再次显示为“onResume”并触摸屏幕
再次连接到服务器,我收到以下发布的logCat错误.
问题.但是当我连接并按下home buttom“应用程序进入onPause”并且我将应用程序再次显示为“onResume”并触摸屏幕
再次连接到服务器,我收到以下发布的logCat错误.
注意：在onPause我urnRegister WiFi接收器,我断开与服务器的连接. logCat输出显示AsyncTask的调用回调序列
我不知道为什么我收到IllegalArgumentException,我读了一些关于它的postes,我测试了名为“client”的对象,它永远不会为null
logcat的：
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)
AsynchTask
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;
}
在onPause：
@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 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;
}
}
解决方法
我认为首先要学习的是完全阅读ErrorLogs并理解它. stacktrace的第一行说明了这一点
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)
即错误在方法getConnection()中的MqttService类中开始.方法getConnection()抛出IllegalArgumentException而不是AsyncTask.它恰好是从AsyncTask内部调用的.此外,变量ClientHandle不是Android API的一部分,它是MqttService的一部分.该变量实际上是无效的并且导致异常.
如果您无法找出变量ClientHandle为无效的原因,您也可以共享您的MqttService类.也许这里的人可以帮助你,但是根据所提供的信息,这是我能回答的问题.希望这可以帮助.
原文地址：https://www.jb51.cc/android/315269.html
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