Rendering Problems
the following classes could not be found:
android.support.v7.internal.widget.ActionBarOverlayLayout (Fix Build Path, Edit XML, Create Class)
Tip: Try to build the project
解決辦法：
把style文件中theme改一下
在Theme.AppCompat.Light.DarkActionBar前面加上Base. 如下
<!-- Base application theme. -->
<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
</style>