The following classes could not be found: android.support.v7.internal.app.WindowDecorActionBar

What causes the following error in the layout preview in Android Studio?

> Rendering Problems The following classes could not be found: > - android.support.v7.internal.app.WindowDecorActionBar (Fix Build Path, Create Class) > Tip: Try to build the project.

The Actionbar has been deprecated and replaced by Toolbar. That being said, you can do the following if you want to continue using Actionbar for now:

1. Open styles.xml in the values folder inside the res folder.
2. Add the word Base to the beginning of the theme name so that it reads "Base.Theme.AppCompat.Light.DarkActionBar"

I had the same issue today and this solution worked for me. FYI I am in Android Studio though, but hopefully,the solution is similar for Eclipse.

FYI here is a decent blog post on replacing the Actionbar with the Toolbar for when you are ready to do so: https://blog.xamarin.com/android-tips-hello-toolbar-goodbye-action-bar/

I think you must be depending on "com.android.support:appcompat-v7:23.1.1" in your module settings.

ActionBar has been deprecated.

Just change your dependencies from 'com.android.support:appcompat-v7:23.1.1' to 'com.android.support:appcompat-v7:23.0.1' in "build.gradle".

You can also change your style parent to "Theme.AppCompat.Light.NoActionBar".

Try to use the Toolbar instead of ActionBar.

This one works for me

Changing AppTheme parent in res/values/styles.xml resolved this problem. Replace

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

with

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

Or you can change API level 21 from list.

goto: res-->values-->styles(V21)-->

Code

<style name="AppTheme.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="android:windowDrawsSystemBarBackgrounds">true</item>
    <item name="android:statusBarColor">@android:color/transparent</item>
</style>

select your theme as Apptheme.NoActionBar in preview. Because ActionBar is depricated, welcome back to ToolBar. NO need to change your dependencies in build.gradle(Module:app). from com.android.support:appcompat-v7:23.1.1 to com.android.support:appcompat-v7:23.0.1.

Hope this will help you!!!

I had a similar issue, and as many have said since ActionBar has been deprecated the trick was to specify

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

NOTE: that the parent ends in .NoActionBar.

Since ActionBar has been deprecated Android has gone into using ToolBar which you can read about here on the developer.android.com

I tried specifying

<style name="AppTheme.NoActionBar">

As a another post stated and that threw errors. Though others may not have that issue.

I have the same problem in Android Studio 1.5 (even with AppCompatActivity), and my attempt to solve the problem was to update my Android Studio to 2.0. It solves the problem in my case. You can found the link download in: http://tools.android.com/download/studio/canary/latest

thanks @joshgoldeneagle, worked in AS v1.4 for me. also effective in AS is to open "build.gradle (Module.app)" and change version from v7.23.1.1 to v7.23.0.1 -hth

Quick fix

Select a theme with no AtcionBar in UI Preview Tool

You will need to change the api rendering level to 17, there may be rendering problem with higher level apis, might be higher level apis suppose to have a default theme, and hope you are not specified none.

For AS v1.4 adding "Base" before Theme.AppCompat.Light.DarkActionBar in the styles.xml folder solved the problem

In res/values/styles.xml, you will find your AppTheme as below :-

Changing the theme in the manifest solved my problem.

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