解决Android Menu遮挡标题栏
<style name="OverflowMenu" parent="Base.Widget.AppCompat.PopupMenu.Overflow">\
<item name="overlapAnchor">false</item>
</style>
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="actionOverflowMenuStyle">@style/OverflowMenu</item>
</style>
