groovy implementation 'com.jakewharton.timber:timber:4.7.1' public class MyApplication extends Application { @Override public void onCreate() { super.onCreate(); if (BuildConfig.DEBUG) { Timber.plant(new Timber.DebugTree()); } } } Timber.d("This is a debug log"); Timber.i("This is an info log"); Timber.w("This is a warning log"); Timber.e("This is an error log"); private static final String TAG = "MainActivity"; ... Timber.d(TAG, "This is a debug log"); Timber.with(new SampleTree()) .d("This is a debug log. Username = %s", sanitize(username)); groovy implementation 'org.apache.logging.log4j:log4j-api:2.15.0' implementation 'org.apache.logging.log4j:log4j-core:2.15.0' Timber.plant(new Log4jTree());