Use log4j2 API within your Android projects instead of Android's Log API. A nice side effect is that log4j2 logger in dependencies also work seamlessly on Android as it does in non-android projects.

• Ensure that the dependency you provide for log4j2-android is runtime or its equivalent
• Ensure that from the final deployment log4j-core library is excluded. log4j2-android is a functional replacement for log4j-core, including both might create unexpected behavior.
• log4j2-android is a runtime library. Naturally, you do not need to modify your android code in any way. You just need to change the dependencies. If you are referencing the classes included in log4j2-android in your code, then there is a good chance that you are doing something wrong!

TLDR? - I distilled the above points in the following build.gradle snippet and use it in my Android project so that I am able to automatically switch between log4j-core for logging during junit testing, and log4j2-android for logging on Android devices (testing or production) without modifying the build.gradle.

configurations.all {
 config -> {
     if (config.name.startsWith("test") || config.name.contains("Test") && !config.name.contains("Android")) {
         exclude group: "com.celeral", module: "log4j2-android"
     } else {
         exclude group:"org.apache.logging.log4j", module:"log4j-core"
     }
 }
 resolutionStrategy {
     force "org.apache.logging.log4j:log4j-api:2.17.2"
 }
}

dependencies {
 implementation "org.apache.logging.log4j:log4j-api:2.17.2"
 testRuntimeOnly "org.apache.logging.log4j:log4j-core:2.17.2"
 runtimeOnly "com.celeral:log4j2-android:1.0.0"
}

Functionality of this package is contained in Java package com.celeral.android.logging.log4j2

To use the package, you need to use the following gradle dependency. Note the scope being runtime since it's a runtime dependency:

dependencies {
  runtimeOnly 'com.celeral:log4j2-android:1.0.0'
}

To use the package, you need to use following Maven dependency. Note the scope being runtime since it's a runtime dependency:

<properties>
  ...
  <!-- Use the latest version whenever possible. -->
  <celeral.version.log4j2.android>1.0.0</celeral.version.log4j2.android>
  ...
</properties>

<dependencies>
  ...
  <dependency>
    <groupId>com.celeral</groupId>
    <artifactId>log4j2-android</artifactId>
    <version>${celeral.version.log4j2.android}</version>
    <scope>runtime</scope>
  </dependency>
  ...
</dependencies>

or download jars from Central Maven repository.

For non-Maven use cases, you download jars from Central Maven repository.