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Duplicate Unity Ads Library in android studio

I am using unity3d in my android studio project and need to import the unity ads aar file into my project. To do so I added the following lines and the unity-ads.aar to the libs folder :
implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
implementation files('libs/unity-ads.aar')
I get the following error when I compile the project :
Duplicate class com.unity3d.ads.BuildConfig found in modules jetified-unity-ads-4.2.1-runtime (com.unity3d.ads:unity-ads:4.2.1) and jetified-unity-ads-runtime (unity-ads.aar)
If I delete these lines and the unity-ads.aar file all the classes from unity3d aren't recogonized and I get errors.
I don't understand why the classes are duplicated and how I can resolve this issue.

You only need the first line
implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
and make sure you update your gradle version to 7.x.x
file -> Project Structure

How do I add an external library (Apache Commons Lang) to an Android Studio app manually?

I know how to work with Apache Commons Lang 3 library in an Android Studio app by implementing it in the build.gradle file using implementation 'org.apache.commons:commons-lang3:3.12.0'. But I want to know if it's possible to include the Apache Commons Lang 3 library (or for that matter, any external library) in the Android app manually if I have the library downloaded on my PC? For example, like adding the .jar file of the library to Android Studio or something of that sort.
I'm asking from the viewpoint where I have a library folder in my PC which doesn't have an online link from which gradle can download and merge it with the Android Studio app automatically. How do I add that library to my Android app? Any elucidation on this matter is complimented.
Regards

These are the steps to add a local library as dependency (.jar):
put the jar file into "libs" folder
add the following line to your build.gradle, inside dependencies:
compile fileTree(dir: 'libs', include: ['*.jar'])
like:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
}

Options in the links listed below actually helped me to achieve my objective properly:
https://www.geeksforgeeks.org/how-to-import-external-jar-files-in-android-studio/
https://medium.com/#jonathanmonga/how-to-add-libraries-in-android-studio-in-english-286db8b073c2

Add FFT algorithm to android studio

i found lot of FFT library on github but i don't know how to add them to my project.
I try to import it without success.
Can you help?
Here what i found:
1) https://sites.google.com/site/piotrwendykier/software/jtransforms
2) https://github.com/wendykierp/JTransforms

If your project has a libs folder for external dependencies then you are good. Else create one under the main project. If you have the jar with all dependencies for the FFT algorithm, put it in the above mentioned libs folder. Next open build.gradle under app and add the following line under dependencies if it not already there..:
compile fileTree(dir: 'libs', include: ['*.jar'])
Sync the project as you usually do.

Jxl.jar in android

I don't know how to add jxl.jar in android studio
I tried to pasts jxl.jar in lib project and using project structure
then tried to start to create WorkBook obj
but not working.
what I missed?

If you use gradle (Android Studio), then add in dependencies:
dependencies {
implementation 'net.sourceforge.jexcelapi:jxl:2.6.12'
}

Paste your jxl.jar into the libs folder
Right click it and select 'Add as library'
Make sure that compile files('libs/jxl.jar') is in your
build.gradle file (or compile fileTree(dir: 'libs', include: '*.jar')
if you are using many jar files) if it still not there then you can try to add it manually by adding this compile files('libs/jxl.jar') inside dependancies
Synch your project

How to add classpath in an Android Studio project

I have an Android project with an Android application that depends on a pure Java library (and the Java library uses some others compiled jars libraries). I added the dependencies, I can build the project, but at run time I have a ClassNotFoundException error.I had to add to theCLASSPATHenvironment variable the path to the jars.Is there a way to set the classpath locally for the project only, like using the command line option
java –classpath <path to the jars>
in the Android studio Run/Debug Configurations?

First off all, be sure there's a "libs" subfolder in the "app" folder of your project. If there's not, create one.
Next, in the app/build.gradle file, add this line of code:
dependencies {
...
compile fileTree(dir:'libs', include: ['*.jar'])
...
}
Place all of your .jar files in the "libs" folder, and voila, you're done

Thanks to Arnold Layne, I created a folder named libs.
Then, I went to
Files -> Project Structure (new menu opens) -> Modules (on the left) -> app -> Dependencies
There, I could add the library with the + Button.
This created this entry:
dependencies {
implementation files('libs/commons-lang3-3.7.jar')
}

Add this lines to build.gradle of app module.
dependencies {
...
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation files('libs/mysql-connector-java-8.0.16')
...
}