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

Question

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.