Android Studio preview is not showing ActionBar

Question

I was updated my Android Studio. Android Studio creates issue in Android preview Android actionbar can't show I don't know what's the issue I tried many times but failed. Action and header doesn't show:

Answer 1

Make sure Show Layout Decorations is checked under the preview panel.

Answer 2

请以 style.xml

检查您的 AppTheme

<resources>

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

Answer 3

确保在“显示系统 UI”预览面板下使用 Android Studio v4.1.1。