Question

我正在尝试从FragmentActivity Map中的Goolge地图中删除标记，如果表中没有可用于服务器端的制造商的数据，那么数据对象也是空的，但我收到以下错误。我该如何解决？

错误：

07-12 20:53:05.697: E/AndroidRuntime(26364): FATAL EXCEPTION: IntentService[IntentService]
07-12 20:53:05.697: E/AndroidRuntime(26364): Process: com.bustracker, PID: 26364
07-12 20:53:05.697: E/AndroidRuntime(26364): java.lang.IllegalStateException: Not on the main thread
07-12 20:53:05.697: E/AndroidRuntime(26364):    at com.google.l.a.ce.b(Unknown Source)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at com.google.maps.api.android.lib6.d.ct.a(Unknown Source)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at com.google.maps.api.android.lib6.d.aq.a(Unknown Source)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at com.google.android.gms.maps.model.internal.t.onTransact(SourceFile:51)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at android.os.Binder.transact(Binder.java:380)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at com.google.android.gms.maps.model.internal.zzi$zza$zza.remove(Unknown Source)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at com.google.android.gms.maps.model.Marker.remove(Unknown Source)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at com.bustracker.GetLLRD.onHandleIntent(GetLLRD.java:120)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at android.os.Handler.dispatchMessage(Handler.java:102)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at android.os.Looper.loop(Looper.java:145)
07-12 20:53:05.697: E/AndroidRuntime(26364):    at android.os.HandlerThread.run(HandlerThread.java:61)

GetLLRD IntentService类中的

onHandleIntent方法：

protected void onHandleIntent(Intent intent) {

                            if (data != null && !data.isEmpty()) {
                                Intent intent1 = new Intent(this, Map.class);
                                intent1.putExtra("list_data", data);
                                intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                                        | Intent.FLAG_ACTIVITY_SINGLE_TOP);
                                startActivity(intent1);

                            } else if (Map.markerMap != null
                                    && !Map.markerMap.isEmpty()) {

                                Iterator<HashMap.Entry<Integer, Marker>> it = Map.markerMap
                                        .entrySet().iterator();
                                while (it.hasNext()) {
                                    HashMap.Entry<Integer, Marker> entery = it
                                            .next();
                                    int key = entery.getKey();
                                    Map.marker = Map.markerMap.get(key);
                                    System.out.println("test marker " + Map.marker ); 
                                    //Line 120.
                                    Map.marker .remove();
                                    Map.markerMap.remove(key);

                                    // Marker value = entery.getValue();
                                }
                            }

映射fragmentActivity：

public class Map extends FragmentActivity implements OnMapReadyCallback {

    GoogleMap map;
    static HashMap<Integer, Marker> markerMap = new HashMap<Integer, Marker>();
    static Marker marker = null;

    ...
    }

Answer 1

异常的快速修复是将地图更新放在Runnable中以在主线程上执行（下面的代码）。但是，问题的真正答案是你需要重新思考你的设计。 IntentService中的代码在活动中使用静态数据是不安全的。使用IntentService的原因是什么？地图更新必须在主线程上运行。 IntentService的目的之一是执行无法在主线程上完成的操作，并且需要后台线程。为什么在包含需要主线程的代码时使用IntentService？

new Handler(Looper.getMainLooper()).post(new Runnable() { @Override public void run() { Iterator<HashMap.Entry<Integer, Marker>> it = Map.markerMap .entrySet().iterator(); while (it.hasNext()) { HashMap.Entry<Integer, Marker> entery = it .next(); int key = entery.getKey(); Map.marker = Map.markerMap.get(key); System.out.println("test marker " + Map.marker ); //Line 120. Map.marker.remove(); // Remove from map using iterator it.remove(); // Marker value = entery.getValue(); } } });

Answer 2

您无法从后台线程启动活动。 onHandleIntent中的代码在后台线程中执行。要从主线程启动活动，您需要将runnable发布到主线程looper。

protected void onHandleIntent(Intent intent) {

      if (data != null && !data.isEmpty()) {

         Handler mainHandler = new Handler(getApplicationContext.getMainLooper());
         mainHandler.post(new Runnable() {
                          @Override
                          public void run() {
                                 Intent intent1 = new Intent(this, Map.class);
                                 intent1.putExtra("list_data", data);
                                 intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                                    | Intent.FLAG_ACTIVITY_SINGLE_TOP);

                                 startActivity(intent1);}
                              });        

      } else if (Map.markerMap != null && !Map.markerMap.isEmpty()) {..........}
}

java.lang.IllegalStateException：不在主线程上

2 个答案: