2

我正在尝试在我的 Activity 的 oncreateMethod 步骤中放大 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，则会引发此异常。遗憾的是，我正在使用的 zoomIn 函数不接受任何参数。

我调用缩放函数的 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，因为我没有做任何特别的事情。

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
4

3 回答 3

3

我找到了解决这种情况的方法。

   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);'

此代码段将地图缩放两次

于 2012-10-26T14:32:25.093 回答
2

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

于 2011-04-12T12:04:49.237 回答
2

Android 直到稍后才会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”或类似的方法中指定它们的大小，也许你可以覆盖它并在那里进行缩放。

于 2010-04-26T11:58:11.770 回答