android studio 3.3 not showing action bar and status bar in its preview window after creating new project

问题

android studio 3.3 not showing action bar and status bar in its preview window after creating new project.i already tried this in build.graadle(module:app) file (implementation'com.android.support:appcompat-v7:28.0.0-alpha1')

回答1:

In the preview tab, click on the eye and select 'Show Layout Decorations'.

EDIT: Toolbar isn't showing because of my style settings - I used 'NoActionBar'. This should work for you, though.

回答2:

 <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>

Try this on your styles.xml

来源：https://stackoverflow.com/questions/54239674/android-studio-3-3-not-showing-action-bar-and-status-bar-in-its-preview-window-a