如何知道活动何时安排？
我有一个地图视图，我想在其上放置一些标记。当我开始活动时，我将从网络服务中检索这些，因此我需要知道当前视口的最小和最大纬度/经度对。我正在打电话，
mMapView.getWidth()
mMapView.getHeight()
但活动开始时它们都返回 0。我尝试将其放在onAttachedToWindow、onResume、onPostCreate、onPostResume、onStart等中，但无济于事。我如何知道活动已完成所有视图的布局并准备好为我提供正确的高度和宽度测量值？
I've got a mapview that I want to put some markers on top of. I'll retrieve these from a webservice when I start the activity, so I need to know the minimum and maximum lat/lng pairs for the current viewport. I'm calling
mMapView.getWidth()
mMapView.getHeight()
But they both return 0 while the activity is starting. I tried putting it in onAttachedToWindow, onResume, onPostCreate, onPostResume, onStart and so on, but to no avail. How can I know that the activity has finished laying out all the views and is ready to give me the correct height and width measurements?
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从我在谷歌搜索中发现的这篇文章：
我尝试过，它有效。
编辑
我发现使用
ViewTreeObserver可能更好，请参阅这个答案。From this post that I've found googling:
I tried and it worked.
EDIT
I've found that it's probably better using a
ViewTreeObserver, see this answer.我认为你必须覆盖 onSizeChanged 并从那里调用 getWidth/Height。请注意，onSizeChanged 在您的 Activity 生命周期中可能会被多次调用（每次视图大小发生变化时）。
I think you have to override onSizeChanged and call getWidth/Height from there. Be aware though that onSizeChanged might get called multiple times during your activity's lifecycle (Everytime the size of the view changes).