Question

我正在尝试在我的Activity的oncreateMethod中放大Google MapView。每次我尝试通过mapController缩放地图时，我都会收到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

如果我调用MapController的zoomOut或zoomIn函数，则抛出此异常。可悲的是我正在使用的zoomIn函数不带任何参数。

我调用缩放功能的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，因为我没什么特别的。

整个堆栈跟踪是：

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

Answer 1

我找到了针对这种情况的解决方法。

   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);'

此代码段缩放地图两次

Answer 2

Android直到稍后才设置视图的宽度和高度，因此在onCreate中它将为0。我认为视图在一个名为“onLayoutChanged”的方法中指定它们的大小或类似的东西，也许你可以覆盖它并在那里进行缩放。

Answer 3

您可能会尝试在onWindowFocusChanged（boolean hasFocus）而不是onCreate或onResume上调用缩放方法。

IllegalArgumentException：width和height必须是＆gt;在Google MapView中的zoomOut期间为0

3 个答案: