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Adding support-v4 library as dependency in Android Studio project?

 
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Hi,

I'm following Big Nerd Ranch Guide (edition from 2015). In chapter 7, we are starting with fragments. The author explained why we should use support libraries, like this:

Authors wrote:The support library includes a complete implementation of fragments that work all the way back
to API level 4. In this book, we will use the support implementation of fragments rather than the
implementation built into the Android OS. This is a good idea because the support library is quickly
updated when new features are added to the fragments API. To use those new features, you can update
your project with the latest version of the support library.



I followed their instructions on how to add app dependencies. My build.gradle (Module app) file, looks like this:



In my Activity, android studio is complaining:


Saying: Cannot resolve Fragment, FragmentActivity, FragmentManager. I also tried some suggestions from SO:

1. File -> Invalidate Chaches / Restart
2. File -> Sync Project With Gradle Files

None worked. How do I get around this?
 
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If you intend to use the v4 Fragment implementation, then you should not import AndroidX classes of the same name. That's bound to cause problems.
 
Mike Gosling
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The same problem persists. I repeated the process of creating new project, without deleting androidX in dependencies.
 
Tim Moores
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I just checked with my main app, and it has the following dependencies:



But then, I switched to extending android.support.v7.app.AppCompatActivity rather than android.support.v4.app.FragmentActivity (the latter is getting a bit long in the tooth, and the former extends it, so there should be few issues using that instead).
 
Mike Gosling
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What did you type in Search box for adding dependencies to get android.support.v7.app.AppCompatActivity ?
 
Tim Moores
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I don't use Android Studio. I probably copied the lines from whatever blog post on the Android developer site talked about the v7 class.
 
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