FloatingActionButton 不能正常显示为圆形
使用 compile 'com.android.support:design:22.2.0'
实现FloatingActionButton效果的问题：
1. 在低于API17时会展示为方形而不是圆形，这只属性 app:borderWidth="0dp" 解决该问题；
2. 不能有名为fab_background的drawable资源；
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This is known by Google and will be fix soon in the next version of the Design Support Library, see this issue: FAB Appears as a square on API 16. It should only concern API 16. The workaround, proposed in the same thread, is to add |
