我有一个Service运行thread. 这thread运行一个timertask，这timertask现在必须运行另一个thread。
我的Service课看起来像这样：
Timer pTimer;
int Time = 1;
int samplerate=100;
int sampleSize=((Time*1000)/samplerate);
Accelerometer_Thread Ac_Thread;
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
pTimer = new Timer();
Ac_Thread = new Accelerometer_Thread();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
// TODO Auto-generated method stub
//super.onStart(intent, startId);
Ac_Thread.start();
return START_STICKY;
}
public class Accelerometer_Thread extends Thread{
@Override
public void run() {
// TODO Auto-generated method stub
super.run();
pTimer.scheduleAtFixedRate(task,0, samplerate);
}
}
/* The Timertask which is to be executed at a periodic interval of "samplerate" */
TimerTask task = new TimerTask() {
@Override
public void run() {
// TODO Auto-generated method stub
String Ack = null;
try {
Ack = Post.PostToWebService("Hello");
} catch (Exception e) {
// TODO Auto-generated catch block
}
if (Ack.contentEquals("1")) {
//Do SOmething
}
else
Log.d("Error", "NotSent To Webservice");
} catch (Exception e) {
// TODO: handle exception
}
}
}
}
};
Post.PostToWebService开始Thread看起来像这样：
public static String ReceivedAcknowledgement=null;
public static String buffer;
public static String PostToWebService(String Payload){
CallPost cp = new CallPost();
buffer = Payload;
ReceivedAcknowledgement="STRT";
try {
cp.join();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
cp.start();
while(ReceivedAcknowledgement=="STRT")
{
try
{
Thread.sleep(10);
}catch(Exception ex)
{
}
}
if(ReceivedAcknowledgement != "STRT")
return ReceivedAcknowledgement;
else
return null;
}
CallPost看起来像这样：
public class CallPost extends Thread{
@Override
public void run() {
// TODO Auto-generated method stub
super.run();
Post.ReceivedAcknowledgement = ParseXML(in);
}
private String ParseXML(InputStream i){
//Parse
}
}
我的服务类在错误显示的行Post.PostToWebService("Hello")中出现错误：
java.lang.RuntimeException：无法在未调用 Looper.prepare() 的线程内创建处理程序
我已经尝试了解 loopers 和 handlers，但我无法理解。