logback-android is a lite version of logback that runs on Android. This library provides a highly configurable logging framework for Android apps, supporting multiple log destinations simultaneously:

• files
• SQLite databases
• logcat
• sockets
• syslog
• email

See Wiki for documentation.

For logback-android@1.x, see the 1.x branch.

1. Create a new "Basic Activity" app in Android Studio.

2. In app/build.gradle, add the following dependencies:

   dependencies {
     implementation 'org.slf4j:slf4j-api:2.0.7'
     implementation 'com.github.tony19:logback-android:3.0.0'
   }

   If using logback-android in unit tests, either use Robolectric, or use this config instead:

   dependencies {
     implementation 'org.slf4j:slf4j-api:2.0.7'
     implementation 'com.github.tony19:logback-android:3.0.0'
     testImplementation 'ch.qos.logback:logback-classic:1.2.11'
   }
   
   configurations.testImplementation {
     exclude module: 'logback-android'
   }

3. Create app/src/main/assets/logback.xml containing:

   <configuration
     xmlns="https://tony19.github.io/logback-android/xml"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="https://tony19.github.io/logback-android/xml https://cdn.jsdelivr.net/gh/tony19/logback-android/logback.xsd"
   >
     <appender name="logcat" class="ch.qos.logback.classic.android.LogcatAppender">
       <tagEncoder>
         <pattern>%logger{12}</pattern>
       </tagEncoder>
       <encoder>
         <pattern>[%-20thread] %msg</pattern>
       </encoder>
     </appender>
   
     <root level="DEBUG">
       <appender-ref ref="logcat" />
     </root>
   </configuration>

4. In MainActivity.java, add the following imports:

   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;

5. ...and modify onOptionsItemSelected() to log "hello world":

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
       Logger log = LoggerFactory.getLogger(MainActivity.class);
       log.info("hello world");
       // ...
   }

6. Build and start the app.

7. Open logcat for your device (via the Android Monitor tab in Android Studio).

8. Click the app menu, and select the menu-option. You should see "hello world" in logcat.

Gradle release

dependencies {
  implementation 'org.slf4j:slf4j-api:2.0.7'
  implementation 'com.github.tony19:logback-android:3.0.0'
}

Gradle snapshot (unstable)

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

dependencies {
  implementation 'org.slf4j:slf4j-api:2.0.7'
  implementation 'com.github.tony19:logback-android:3.0.1-SNAPSHOT'
}

Use these commands to create the AAR:

git clone git://github.com/tony19/logback-android.git
cd logback-android
scripts/makejar.sh

The file is output to:

./build/logback-android-3.0.0-debug.aar

1. CD into ./scripts/release.

2. Install deps: npm install

3. Make sure local.properties contains the following keys, required to sign artifacts and upload to Maven Central:

   # output from `gpg --export-secret-keys <PUBKEY_LAST8> | base64`
   signing.key=
   # PUBKEY_LAST8 from `gpg --list-keys` (last 8 digits of pub key)
   signing.keyId=
   # password for key (can be empty if key has no password)
   signing.password=
   # path to secring.gpg file from `gpg --keyring secring.gpg --export-secret-keys > ~/.gnupg/secring.gpg`
   signing.secretKeyRingFile=/Users/tony/.gnupg/secring.gpg
   # OSS sonatype username at https://issues.sonatype.org
   ossrhUsername=
   # OSS sonatype password at https://issues.sonatype.org
   ossrhPassword=
   # profile ID from https://oss.sonatype.org/#stagingProfiles (select profile, and copy profile ID from hash in address bar)
   sonatypeStagingProfileId=b2413418ab44f

4. Do a dry-run: npm run start --dry

5. If everything looks good, rerun without --dry.

6. Confirm the artifacts were uploaded in https://repo1.maven.org/maven2/com/github/tony19/logback-android/3.0.0/.