Can I use Timber Logger on my java library?

If anyone looking at Timber (Without android dependency) for mutli-module android project. Use timber-jdk like below.

In project's build.gradle file.

allprojects {
    repositories {
        maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' }
    }
}

In individual module build.gradle file (Example: Domain or remote module)

implementation "com.jakewharton.timber:timber-jdk:5.0.0-SNAPSHOT"

With this you should be able to implement Timber without android framework dependency

If you have multi-module project, you can use Timber in pure Java/Kotlin with a tiny bit of abstraction involved, no external libraries.

Example with Kotlin and Koin:

In pure kotlin module create a big imposter, Timber.kt:

interface ILogger {
    fun d(message: String)
    fun e(message: String)
    fun e(throwable: Throwable, message: String)
    fun i(message: String)
}

object Timber: ILogger, KoinComponent {

    private val logger: ILogger by inject()

    override fun d(message: String) = logger.d(message)
    override fun e(message: String) = logger.e(message)
    override fun e(throwable: Throwable, message: String) = logger.e(throwable, message)
    override fun i(message: String) = logger.i(message)
}

In app module create TimberLogger.kt:

import timber.log.Timber

class TimberLogger : ILogger {

    override fun d(message: String) = Timber.d(message) // this is real timber this time
    override fun e(message: String) = Timber.e(message)
    override fun e(throwable: Throwable, message: String) = Timber.e(throwable, message)
    override fun i(message: String) = Timber.i(message)
}

In app module, inject TimberLogger implementation into your fake Timber:

val appModule = module {

    single<ILogger> { TimberLogger() }
}

Now you can simply call Timber.d("message") statically from anywhere.

If you have 2+ pure modules to use Timber in, consider creating Utils module and include it in rest of them, so it's available everywhere.