我有一个任务,要显示在
Android地图中显示的458个标记.为避免与性能相关的问题,我使用AsyncTask实例更新了地图上的数据.
这是我做的一个简短场景.
>我取得英国各地458个地点的纬度/经度.
>我运行循环,根据Android博客教程,我将它们添加到ItemizedOverlay类中
>每50次迭代后,我调用publishProgress方法在地图中放置50个标记.
在第50次迭代之后,流程通过publishProgress进入onProgressUpdate,这是我的onProgressUpdate方法的代码
// MapOverLays = mapView.getOverlays(); //This line was called in asyc task's constructor // Hello Overlay is an instance of ItemizedOverlay. mapOverlays.add(helloOverLay); //MapView.getController - Also called in Constructor controller.setZoom(12); controller.animateTo(centerPoint); controller.setCenter(centerPoint);
此代码抛出ArrayIndexOutOfBoundException,并且logcat不显示我的模块中的任何类.如果它解释了我的问题,这是logcat转储.
12-07 11:34:48.644: ERROR/AndroidRuntime(508): java.lang.ArrayIndexOutOfBoundsException 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at com.google.android.maps.ItemizedOverlay.getIndexToDraw(ItemizedOverlay.java:211) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at com.google.android.maps.ItemizedOverlay.draw(ItemizedOverlay.java:240) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at com.google.android.maps.Overlay.draw(Overlay.java:179) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at com.google.android.maps.OverlayBundle.draw(OverlayBundle.java:42) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at com.google.android.maps.MapView.onDraw(MapView.java:476) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.View.draw(View.java:6535) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewGroup.drawChild(ViewGroup.java:1531) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.View.draw(View.java:6538) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.widget.FrameLayout.draw(FrameLayout.java:352) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewGroup.drawChild(ViewGroup.java:1531) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewGroup.drawChild(ViewGroup.java:1529) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.View.draw(View.java:6538) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.widget.FrameLayout.draw(FrameLayout.java:352) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1830) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewRoot.draw(ViewRoot.java:1349) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewRoot.performTraversals(ViewRoot.java:1114) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.view.ViewRoot.handleMessage(ViewRoot.java:1633) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.os.Handler.dispatchMessage(Handler.java:99) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.os.Looper.loop(Looper.java:123) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at android.app.ActivityThread.main(ActivityThread.java:4363) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at java.lang.reflect.Method.invokeNative(Native Method) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at java.lang.reflect.Method.invoke(Method.java:521) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 12-07 11:34:48.644: ERROR/AndroidRuntime(508): at dalvik.system.NativeStart.main(Native Method)
附：我已经使用相对较小(10)和相对较大(150)的迭代而不是50来测试应用程序.但应用程序抛出相同的错误.
解决方法
我有同样的问题.看起来它是由更新ItemizedOverlay中的数据而不事后调用populate引起的.
public class ListOverlay extends ItemizedOverlay<OverlayItem> {
...
public synchronized void updateLocations(List<OverlayItem> newLocations) {
locations.clear();
locations.addAll(newLocations);
populate(); // this was missing
}
protected synchronized OverlayItem createItem(int index) {
return locations.get(index);
}
public synchronized int size() {
return locations.size();
}
}
