• https://code.google.com/archive/p/android-logging-log4j/
• https://mvnrepository.com/artifact/de.mindpipe.android/android-logging-log4j

使用：

1. 添加依赖

   implementation 'log4j:log4j:1.2.17'
   implementation 'de.mindpipe.android:android-logging-log4j:1.0.3'
   
   

2. 添加存储权限

3. 初始化配置

class App : Application() {

    override fun onCreate() {
        super.onCreate()
        val config = LogConfigurator()
        val filePath = "${Environment.getExternalStorageDirectory()}/myapp.log"
        println("filePath = $filePath")
        config.fileName = filePath
        config.rootLevel = Level.DEBUG
        config.setLevel("org.apache", Level.ERROR)
        config.configure()
    }

}

4. 打印日志

class MainActivity : AppCompatActivity() {

    private val log: Logger = Logger.getLogger(MainActivity::class.java.simpleName)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        log.info("Hello")
        log.debug("World")
    }
    
}

控制台输出效果如下：

2022-07-20 11:54:23.133 8663-8663/cn.android666.android_sip I/MainActivity: Hello
2022-07-20 11:54:23.134 8663-8663/cn.android666.android_sip D/MainActivity: World

SD卡根目录中的myapp.log文件内容如下：

2022-07-20 11:54:23,130 - [INFO::MainActivity::cn.android666.android_sip.MainActivity] - Hello
2022-07-20 11:54:23,133 - [DEBUG::MainActivity::cn.android666.android_sip.MainActivity] - World