Android Studio Build APK ClassNotFoundException

Question

My app is split in many projects, which are included as a dependency in my main library which is a dependency in my app.

• Project Main

  • Module App
    
    • Dependencies
      • MainLibrary Module
  • Module MainLibrary
    • Dependencies
      
      • Project X
      • Project Y

• Project X

  • Module 1
  • Module 2
• Project Y
  • Module 1

My first problem is, that my dependency to Project X is not packaged in my APK Dex File and i get a ClassNotFoundException if the app starts and the class in this module is used. I declare the dependency with provided project(':beacon')

The second problem is, that i have to declare the dependencies in my MainLibrary Module and in my AppModule. Thats twice.

Thank you for your help

Answer 1

That's what the provided dependency scope -- it uses the dependency for compiling but doesn't bundle it into the output. Use the compile scope instead.

As for needing to declare a dependency on Project X in more than one place, that's because dependencies aren't transitive. If Module App depends on Project X , it needs to declare that explicitly and not depend on getting it through a sub-dependency. That's not to say that if you use the compile scope the sub-dependency won't be included in the output, but if you want to depend on it from a parent module, it needs to declare its dependency separately.