Android studio不能在布局预览的问题

The following classes could not be instantiated:
- android.support.v7.widget.ActionBarContainer (Open Class, Show Exception, Clear Cache)
- android.support.v7.widget.AppCompatEditText (Open Class, Show Exception, Clear Cache)
- android.support.v7.widget.ActionBarContextView (Open Class, Show Exception, Clear Cache)
- android.support.v7.app.WindowDecorActionBar (Open Class, Show Exception, Clear Cache)

解决方案：打开res -> values -> Styles.xml

把

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

修改为

<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

好了。