销毁的MapView [英] Destroy MapView
问题描述
我有一个MapActivity在那里你可以图形页面（谷歌地图）和OfflineMapView之间切换（我的课，将显示在地图previously下载到SD卡）。在地图之间切换我要彻底摧毁，并创建地图的意见，以便只有一个地图视图是在内存中。我想这有两个原因：
I have a MapActivity where you can switch between MapView (Google Maps) and OfflineMapView (my class, shows a map previously downloaded to SD card). When switching between maps I want to completely destroy and create the map views so that only one map view is in the memory. I want this for 2 reasons:
- 我OfflineMapView最需要的可用内存用于缓存的瓷砖。
- 谷歌MapView获得一些附加的线程，我不希望运行时，OfflineMapView是可见的。
我试图从布局中删除的MapView和空我提到它，但是当我想再次显示它我得到一个异常说MapActivity只能有一个图形页面。
I tried to remove the MapView from layout and null my reference to it but when I want to show it again I get an exception saying that MapActivity can have only one MapView.
编辑：
谷歌MapView类的presence（可见性设置为GONE）不会对OfflineMapView FPS任何影响。我没有得到任何OutOfMemoryError异常无论是。
The presence of Google MapView (visibility is set to GONE) doesn't have any effect on OfflineMapView FPS. I didn't get any OutOfMemoryErrors either.
推荐答案
使用的ActivityGroup 为你的活动类和有它启动和停止子活动为每种类型的地图。例如，获得了谷歌地图的视图：
Use ActivityGroup as your Activity class and have it start and stop sub-activities for each type of map. For example, to get the view for the Google Map:
Intent intent = new Intent(this, GoogleMapActivity.class);
Window window = getLocalActivityManager().startActivity("google-map", intent);
View googleMapView = window.getDecorView();
container.addView(googleMapView);
要摧毁它：
container.removeView(googleMapView);
getLocalActivityManager().removeAllActivities();
和做同样的离线地图。这应该完全停止 MapActivity 和它的线程。
and do the same with your offline map. This should completely stop the MapActivity and it's threads.
请注意，我已经找到 LocalActivityManager.destroyActivity（）是马车，所以我用 LocalActivityManager（）。removeAllActivities（）中的例子，因为它为这种情况下工作。
Note that I have found LocalActivityManager.destroyActivity() to be buggy, so I used LocalActivityManager().removeAllActivities() in the example since it does work for this case.
这篇关于销毁的MapView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
