android - MapView 上的 java.util.ConcurrentModificationException

Question

伙计们

我很多天都面临着非常奇怪的问题。我正在尝试经常更新叠加层。所以有时当我触摸 map 时我会收到“java.util.ConcurrentModificationException”，或者有时本地图试图更新覆盖时我会收到“java.util.ConcurrentModificationException”但是我没有找到完美的线，这个错误即将到来。

02-17 14:56:01.621: W/dalvikvm(3653): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-17 14:56:01.631: E/AndroidRuntime(3653): FATAL EXCEPTION: main
02-17 14:56:01.631: E/AndroidRuntime(3653): java.util.ConcurrentModificationException
02-17 14:56:01.631: E/AndroidRuntime(3653):     at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:576)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at com.google.android.maps.OverlayBundle.draw(OverlayBundle.java:41)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at com.google.android.maps.MapView.onDraw(MapView.java:530)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.View.draw(View.java:6880)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.View.draw(View.java:6883)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.widget.FrameLayout.draw(FrameLayout.java:357)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.View.draw(View.java:6883)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.widget.FrameLayout.draw(FrameLayout.java:357)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.View.draw(View.java:6883)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.widget.FrameLayout.draw(FrameLayout.java:357)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1862)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewRoot.draw(ViewRoot.java:1522)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewRoot.performTraversals(ViewRoot.java:1258)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.os.Looper.loop(Looper.java:130)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at android.app.ActivityThread.main(ActivityThread.java:3683)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at java.lang.reflect.Method.invokeNative(Native Method)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at java.lang.reflect.Method.invoke(Method.java:507)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-17 14:56:01.631: E/AndroidRuntime(3653):     at dalvik.system.NativeStart.main(Native Method)

我正在使用 Balloon Overlay

我认为它在 "mapview.getOverlay()" 上抛出错误，因为它在 1 秒内调用了 4-5 次。

谢谢，

卡普机器人

这里是代码流.. 我的线程代码....

Thread connection = new Thread(){
        public void run() {
            try {

                while (my condition)
                {
                    try 
                    {
                                        //This method should be call every seconds
                        updateMethod();
                    } 
                    catch (Exception e) 
                    {
                        e.printStackTrace();
                        break;
                    }
                } 
            } 
            catch (Exception e) 
            {

            }
        }
    };

这是我的 updateMethod(); 在这段代码中，hashmapOverlay 是如下所示的 HashMap

 public static Map<String,MyItemizedOverlay> hashmapOverlay;

 public void updateMethod()
{

                    if(hashmapOverlay.containsKey(id))
                        {
                            mapview.getOverlays().remove(hashmapOnlineFriendsOverlay.get(id));
                        }
                    MyItemizedOverlay mMyItemizedOverlay = new MyItemizedOverlay(drawable, mapview);
                        OverlayItem overlayItem = new OverlayItem(gp,title ,snippet);
                        mMyItemizedOverlay.addOverlay(overlayItem); 
                    hashmapOverlay.put(id, mMyItemizedOverlay);
                    addOverlayMethod(mActivity, mapView, mMyItemizedOverlay);   

}

这是我的 addOverlayMethod

addOverlayMethod(Activity mActivity, final MapView mapView, final Object mObject)
{
    mActivity.runOnUiThread(new Runnable(){

        @Override
        public void run()
        {

                try {
                    MyItemizedOverlay overlay = (MyItemizedOverlay) mObject;
                    mapView.getOverlays().add(overlay);
                } catch (Exception e)
                {}              

        }
    });
}

Answer 1

为了避免ConcurrentModificationException在以下任何情况下只需复制您的收藏:

• 在遍历集合之前
• 在将其传递到 API 之前

乍一看，这似乎有些过分，但以后会省去很多麻烦。复制很简单，调用new ArrayList<YourClass>(existingList)即可.