Android studio - App with library project fails to build

Question

I\'m having massive trouble trying to get my app project to build. I have the main app module and a library project module as shown below:

Answer 1

Just explicitly tells gradle that your library project must not being minified by adding/modifying section

android/buildTypes/debug

of your library project's build.gradle file like this (minifyEnabled false is the key):

android {
...
    buildTypes {
        debug {
            debuggable true
            minifyEnabled false
        }
...
    }
...
}

Note:

Here, I also instruct explicitly gradle to make my 'debug' build debuggable (debuggable true).

Answer 2

When Gradle builds the library project, it's building the release type even if you're building the debug type for your main app (this is a bug). In your library project, you have Proguard configured for your release build type, and Proguard is obfuscating the symbol names, making them invisible to your app.

Since you control the library code, the best thing is to not run Proguard in your library build, and just run it for release builds of your main app. It will obfuscate all code, including the dependencies.

If you really want to obfuscate the library code independently, you'll need to set up the Proguard rules to expose the public symbols of the library, DatePickerDialog being one.