How to import existing Java.class Files to Android Studio Project - file

Question

I need to know how I can properly add existing Java.class files to an Android Studio Project. My goal is to use these classes in an Android Project.
The Class Files are already written in Eclipse for another Java Project.
I've already tried File->New->New Module->selecting Java Library->Finish but that doesn't work properly.
As you probably all know it makes the MyClass Class by default.
For testing I imported com.example.* in my MainActivity and tried to build an Object of that Class inside the onCreate() Method.
The problem is it can't compile the Project. I got the following Errors:
Error:(7, 1) error: package com.example does not exist
Error:(16, 9) error: cannot find symbol class MyClass
Note: C:\Users\...\MainActivity.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Error:Execution failed for task ':app:compileDebugJava'.
> Compilation failed; see the compiler error output for details.
Can anybody explain how to import my Java.class files correctly so that I can use them in my project?

Answer 1

You can add as a local library package to your project in Android Studio.
In android Project window, right click on app and select New -> Module.
In the Create New Module window, select Java Library and click next. Then give the module name, for example HttpClient in Library Name field. Then give Java package name as same as your existing package com.example.xxx. Then give one existing class file name AnyFileName in Java Class Name field.
Now new module is created with the name HttpClient and the package name is com.example.xxx. With an empty class file Anyfilename.java
Now copy all your .java files to the HttpClient folder created inside your android project. Now it would have overwritten the empty file Anyfilename.java also.
After copying all .java files would have automatically added to the library module.
And you will get 3rd build.gradle file for your module. Already you might be having 2 build.gradle for your android project.
In your app's build.gradle file, include local library dependency compile project(":HttpClient"). Now you can import java files in HttpClient module to android app's java files.
Note : Above information is given based on Android Studio 2.3.3