Android java.lang.RuntimeException:Looper.prepare（）出现问题

我正在我的应用程序中使用AsyncTask，代码是

protected Void doInBackground(Void... params) {
        // Get the current thread's token

        try {
            synchronized (this) {
                Looper.prepare();                   
                if (isCancelled()) {

                } else {                        
                    gpsCoordinates = new GetGpsCoordinates();   
                    location = gpsCoordinates.getLocation(context);

                    int counter = 0;
                    while (counter <= 4) {
                        this.wait(850);
                        counter++;
                        publishProgress((int) (counter) * 50);
                    }
                }
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        return null;
    }

如果我使用looper.prepare（），我将获得豁免。 这是我的日志

 06-05 17:26:16.410: E/AndroidRuntime(19075): java.lang.RuntimeException: An error occured while executing doInBackground()
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at android.os.AsyncTask$3.done(AsyncTask.java:200)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at  java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.FutureTask.run(FutureTask.java:138)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.lang.Thread.run(Thread.java:1019)
 06-05 17:26:16.410: E/AndroidRuntime(19075): Caused by: java.lang.RuntimeException: Only one Looper may be created per thread
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at android.os.Looper.prepare(Looper.java:74)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at com.bu.PropertySearchTypes.CameraSearch$LoadViewTask.doInBackground(CameraSearch.java:125)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at com.bu.PropertySearchTypes.CameraSearch$LoadViewTask.doInBackground(CameraSearch.java:1)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at android.os.AsyncTask$2.call(AsyncTask.java:185)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)

我在onSensorChanged（）中调用这个asynctask，也就是说，对于每个传感器值的更改，都会执行这个线程。 请帮帮我。我对这个例外感到非常失望。

---

谢谢你的帮助

必须在新线程中启动新循环器。异常包含此信息。有关正确用法，请查看此帖子：

但真正的问题是你是否需要它？如果要启动处理程序，则需要它。我不确定您是否需要它，但即使您需要它，也有专门的类为您处理活套

 06-05 17:26:16.410: E/AndroidRuntime(19075): java.lang.RuntimeException: An error occured while executing doInBackground()
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at android.os.AsyncTask$3.done(AsyncTask.java:200)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at  java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.FutureTask.run(FutureTask.java:138)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.lang.Thread.run(Thread.java:1019)
 06-05 17:26:16.410: E/AndroidRuntime(19075): Caused by: java.lang.RuntimeException: Only one Looper may be created per thread
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at android.os.Looper.prepare(Looper.java:74)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at com.bu.PropertySearchTypes.CameraSearch$LoadViewTask.doInBackground(CameraSearch.java:125)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at com.bu.PropertySearchTypes.CameraSearch$LoadViewTask.doInBackground(CameraSearch.java:1)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at android.os.AsyncTask$2.call(AsyncTask.java:185)
 06-05 17:26:16.410: E/AndroidRuntime(19075):   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)