我正在尝试放大活动oncreatemethod中的googlemappview on步骤。
每次我试图通过mapcontroller缩放地图时，都会收到一个IllegalArgumentException：
04-15 10:16:51.012: ERROR/AndroidRuntime(528): java.lang.RuntimeException: Unable to start activity ComponentInfo{android.client/android.client.ui.showstores.StoreMap}: java.lang.IllegalArgumentException: width and height must be > 0
如果调用MapController的zoomout或zoomin函数，则会引发此异常。遗憾的是，我使用的zoomin函数没有任何参数。
调用zoom函数的oncreatemethod如下所示：
mapView = (MapView) findViewById(R.id.map);
mapView.setBuiltInZoomControls(true);
MapController mapController = mapView.getController();
mapController.zoomIn();
我在这里有点不知所措，因为我没有做什么特别的事。
整个stacktrace是：
04-15 10:16:51.012: ERROR/AndroidRuntime(528): java.lang.RuntimeException: Unable to start activity ComponentInfo{android.client/android.client.ui.showstores.StoreMap}: java.lang.IllegalArgumentException: width and height must be > 0
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.os.Handler.dispatchMessage(Handler.java:99)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.os.Looper.loop(Looper.java:123)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.app.ActivityThread.main(ActivityThread.java:4203)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at java.lang.reflect.Method.invokeNative(Native Method)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at java.lang.reflect.Method.invoke(Method.java:521)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at dalvik.system.NativeStart.main(Native Method)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): Caused by: java.lang.IllegalArgumentException: width and height must be > 0
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.graphics.Bitmap.nativeCreate(Native Method)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.graphics.Bitmap.createBitmap(Bitmap.java:468)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at com.google.android.maps.ZoomHelper.createSnapshot(ZoomHelper.java:305)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at com.google.android.maps.ZoomHelper.doZoom(ZoomHelper.java:137)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at com.google.android.maps.ZoomHelper.doZoom(ZoomHelper.java:126)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at com.google.android.maps.MapView.doZoom(MapView.java:1459)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at com.google.android.maps.MapView.doZoom(MapView.java:1468)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at com.google.android.maps.MapController.zoomIn(MapController.java:427)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.client.ui.showstores.StoreMap.onCreate(StoreMap.java:58)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
04-15 10:16:51.012: ERROR/AndroidRuntime(528): ... 11 more
最佳答案
我找到了解决办法。
int zoomSteps = 2;
int currentLatitudeSpan = mMapView.getLatitudeSpan();
int currentLongitudeSpan = mMapView.getLongitudeSpan();
int zoomedLatitudeSpan = 2 * zoomSteps * currentLatitudeSpan;
int zoomedLongitudeSpan = 2 * zoomSteps * currentLongitudeSpan;
mMapController.zoomToSpan(zoomedLatitudeSpan, zoomedLongitudeSpan);'
这个片段将地图放大两次