Android Studio 新建專案出現的問題，最新版的AndroidStudio新建專案後可能在layout佈局檔案中預覽不了我們寫的佈局報下面錯誤

 Rendering Problems The following classes could not be instantiated:
- android.support.v7.internal.widget.ActionBarOverlayLayout (Open Class, Show Exception, Clear Cache)
 Tip: Use View.isInEditMode() in your custom views to skip code or
 
 show sample data when shown in the IDE  Exception Details java.lang.ClassNotFoundException: android.support.v7.appcompat.R$attr Copy stack to clipboard 

百度搜搜尋的時候很少有類似的錯誤，大多說在File/Project Str8cture/app/Dependencies裡面新增v7包，實際預設已經添加了。解決起來很容易最簡單的方法就是修改主題，如下所示

解決方案

<resources>

    <!-- Base application theme. -->
 

    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>
</resources>
<!-------------華麗的分割線------------------>
<!--將Theme修改成為-->
<resources>

    <!-- Base application theme. -->
    <style
 
 name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>

</resources>

OK大功告成，再去看看，可以了吧。