Android-->Log system logger saves the log to the local

A good program can solve problems from Log.
A good Log system is the key to a program.

This article introduces Logback-Android, a library that can write Log to File, to database, to Email, and to network.
Of course, the most basic Logcat window is perfect for output, which is the most basic;

Open source address:  https://github.com/tony19/logback-android
slf4j address:  http://www.slf4j.org/
slf4j API documentation:  http://www.slf4j.org/api/
if you need to know more Many, please use Baidu (Google);

logback official WIKI:  https://github.com/tony19/logback-android/wiki
logback API documentation:  http://tony19.github.io/logback-android/doc/1.1.1-4/

Recommended reading:  http://blog.csdn.net/haidage/article/details/6794529

---

1: Add the following dependencies to build.gradle in Module

dependencies {
    ...
    compile 'org.slf4j:slf4j-api:1.7.21'
    compile 'com.github.tony19:logback-android-core:1.1.1-5'
    compile 'com.github.tony19:logback-android-classic:1.1.1-5'
}

2: Create a logback.xml file in the following location, this path and file name are fixed by default

3: Configure logback file

<!--debug属性用来决定是否打印logback的日志信息-->
<configuration debug='false'>

    <!--声明一个属性,用来指定log文件存放的路径-->
    <property name="LOG_DIR" value="/sdcard/rlog"/>

    <!--声明一个时间戳-->
    <timestamp datePattern="yyyyMMdd" key="today"/>

    <!--用于在控制台输出的Appender-->
    <appender name="LOGCAT" class="ch.qos.logback.classic.android.LogcatAppender">
        <encoder>
            <pattern>%-5relative [%thread][%file:%M:%line] - %msg%n</pattern>
        </encoder>
    </appender>

    <!--声明一个FileAppender-->
    <appender name="BASE_FILE" class="ch.qos.logback.core.FileAppender">
        <!--初始化的时候不创建文件,在第一次使用的时候创建文件-->
        <lazy>true</lazy>
        <!--log追加到文件,否则覆盖文件-->
        <append>true</append>
        <!--用来保存log的文件全路径-->
        <file>${LOG_DIR}/base.log</file>
        <!--输出log的格式-->
        <encoder>
            <!--<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} [%file:%line] - %msg%n</pattern>-->
            <pattern>%date [%thread] %-5level %logger{36} [%file:%line] - %msg%n</pattern>
        </encoder>
    </appender>

    <!--声明一个RollingFileAppender-->
    <appender name="BASE_ROLL_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_DIR}/base.roll.${today}.log</file>
        <append>true</append>
        <encoder>
            <pattern>%date %-5relative [%thread] %-5level %logger{36} [%file:%M:%line] - %msg%n
            </pattern>
        </encoder>

        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${LOG_DIR}/base.roll.%d{yyyy-MM-dd}.log</fileNamePattern>
            <!--最大保存7天的日志-->
            <maxHistory>7</maxHistory>
        </rollingPolicy>

        <!--文件大于10mb,切换文件-->
        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <maxFileSize>10MB</maxFileSize>
        </triggeringPolicy>
    </appender>

    <!--指定logtest采用BASE_ROLL_FILE声明的RollingFileAppender输出日志-->
    <logger name="logtest">
        <appender-ref ref="BASE_ROLL_FILE"/>
    </logger>

    <!-- Write INFO (and higher-level) messages to the log file -->
    <root level="TRACE">
        <appender-ref ref="LOGCAT"/>
    </root>

    <!--支持的level-->
    <!--TRACE-->
    <!--DEBUG-->
    <!--INFO-->
    <!--WARN-->
    <!--ERROR-->

    <!--<pattern>
      %d{yyyy-MM-dd HH:mm:ss} [%level] - %msg%n
      Logger: %logger
      Class: %class
      File: %file
      Caller: %caller
      Line: %line
      Message: %m
      Method: %M
      Relative: %relative
      Thread: %thread
      Exception: %ex
      xException: %xEx
      nopException: %nopex
      rException: %rEx
      Marker: %marker
      %n
  </pattern>-->

    <!--引用其他位置的配置信息-->
    <!--<includes>-->
    <!--<include file="/sdcard/foo.xml"/>-->
    <!--<include resource="assets/config/test.xml"/>-->
    <!--<include resource="AndroidManifest.xml"/>-->

    <!--<include file="/sdcard/logback/logback-test.xml"/>-->
    <!--<include file="/sdcard/logback/logback.xml"/>-->
    <!--<include resource="AndroidManifest.xml"/>-->
    <!--<include resource="assets/logback-test.xml"/>-->
    <!--<include resource="assets/logback.xml"/>-->
    <!--</includes>-->
</configuration>

There are other appenders available, detailed instructions for moving:
http://logback.qos.ch/manual/appenders.html

4: code test

Log information saved in the file:

Easter eggs: color settings of the console

Friendly reminder, you may need to add the following permissions:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Project address:  https://github.com/angcyo/LogbackDemo