android – 尝试从Google Cloud Messaging消息更改Google Maps v2 Api上的标记时的非法状态异常

我正在编写一个 Android应用程序,我在Google地图上有标记,应该更改为我通过GCM收到的位置.
我有一个全局静态列表,我将标记与id和位置一起保存.
当我收到消息时,我可以在GCMBaseIntentService中更改列表中对象的位置,但是当我想执行以下代码时：

mMarker.setPosition(new LatLng(member.getLatitude(),member.getLongitude()));

我得到以下例外：

01-13 18:52:38.118: E/AndroidRuntime(7605): FATAL EXCEPTION: IntentService[GCMIntentService-1041237551356-1]
    01-13 18:52:38.118: E/AndroidRuntime(7605): java.lang.IllegalStateException: Not on the main thread
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at maps.am.r.b(UnkNown Source)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at maps.ar.d.b(UnkNown Source)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at maps.y.ae.addMarker(UnkNown Source)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at com.google.android.gms.maps.internal.IGoogleMapDelegate$Stub.onTransact(IGoogleMapDelegate.java:167)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at android.os.Binder.transact(Binder.java:279)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at com.google.android.gms.maps.internal.IGoogleMapDelegate$a$a.addMarker(UnkNown Source)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at com.google.android.gms.maps.GoogleMap.addMarker(UnkNown Source)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at com.example.MapViewActivity.showMember(MapViewActivity.java:529)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at com.example.MapViewActivity.updateMember(MapViewActivity.java:417)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at com.example.MapViewActivity.updateMembers(MapViewActivity.java:410)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at com.example.pushnotifications.GCMIntentService.onMessage(GCMIntentService.java:75)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at com.google.android.gcm.GCMBaseIntentService.onHandleIntent(GCMBaseIntentService.java:223)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:59)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at android.os.Handler.dispatchMessage(Handler.java:99)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at android.os.Looper.loop(Looper.java:130)
    01-13 18:52:38.118: E/AndroidRuntime(7605):     at android.os.HandlerThread.run(HandlerThread.java:60)

我尝试在地图上添加一个按钮来刷新所有标记(具有完全相同的代码),并且工作正常.
所以不知何故问题是GCM是在不同的线程或类似的东西中执行的,似乎我无法从不同的线程中更改标记…

我尝试了一个丑陋的解决方案：每秒刷新所有标记.
但是从MapViewActivity创建一个线程会产生相同的异常：

private Thread MarkerUpdater = new Thread(
    new Runnable() {
        public void run() {
            while(true) {
                updateMembers();
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // Todo Auto-generated catch block
                    e.printstacktrace();
                }
            }
        }
    });

也许有人知道一个好的解决方案会是什么样子？

Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable(){ 
   // your UI code here 
}