原文地址：https://github.com/tony19/logback-android/issues/54

Please provide an example of how to configure the AsyncAppender with a FileAppender to write to the file in an async way. I am getting many StrictMode policy violations (StrictModeDiskWriteViolation) on every log write to my log file.Thanks.

I verified the following config works in Android 4.2.2 without any exceptions.

<configuration debug="true"><property name="LOG_DIR" value="/data/data/com.example/files" /><appender name="FILE" class="ch.qos.logback.core.FileAppender"><file>${LOG_DIR}/log.txt</file><encoder><pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{35} - %msg%n</pattern></encoder></appender><appender name="ASYNC" class="ch.qos.logback.classic.AsyncAppender"><appender-ref ref="FILE" /></appender><root level="DEBUG"><appender-ref ref="ASYNC" /></root> </configuration>

Example: Configure by in-memory XML string

package com.example;import java.io.ByteArrayInputStream; import java.io.InputStream;import org.slf4j.LoggerFactory;import ch.qos.logback.classic.LoggerContext; import ch.qos.logback.classic.joran.JoranConfigurator; import ch.qos.logback.core.joran.spi.JoranException; import android.app.Activity; import android.os.Bundle; import android.view.Menu;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);configureLogbackByString();org.slf4j.Logger log = LoggerFactory.getLogger(MainActivity.class);log.info("hello world!!");}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu);return true;}@Overrideprotected void onDestroy() {super.onDestroy();// Assume SLF4J is bound to logback-classic in the current environment.// This must be called to properly shutdown AsyncAppender and flush logs// upon application exit.LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();loggerContext.stop();}String LOGBACK_XML ="<configuration debug='true'>" +" <property name='LOG_DIR' value='/data/data/com.example/files' />" +" <appender name='FILE' class='ch.qos.logback.core.FileAppender'>" +" <file>${LOG_DIR}/log.txt</file>" +" <encoder>" +" <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{35} - %msg%n</pattern>" +" </encoder>" +" </appender>" +" <appender name='ASYNC' class='ch.qos.logback.classic.AsyncAppender'>" +" <appender-ref ref='FILE' />" +" </appender>" +" <root level='DEBUG'>" +" <appender-ref ref='ASYNC' />" +" </root>" +"</configuration>";private void configureLogbackByString() {// reset the default context (which may already have been initialized)// since we want to reconfigure itLoggerContext lc = (LoggerContext)LoggerFactory.getILoggerFactory();lc.reset();JoranConfigurator config = new JoranConfigurator();config.setContext(lc);InputStream stream = new ByteArrayInputStream(LOGBACK_XML.getBytes());try {config.doConfigure(stream);} catch (JoranException e) {e.printStackTrace();}} }

Example: Configure with direct calls into logback

package com.example;import org.slf4j.Logger; import org.slf4j.LoggerFactory;import android.app.Activity; import android.os.Bundle; import android.view.Menu; import ch.qos.logback.classic.AsyncAppender; import ch.qos.logback.classic.LoggerContext; import ch.qos.logback.classic.encoder.PatternLayoutEncoder; import ch.qos.logback.classic.spi.ILoggingEvent; import ch.qos.logback.core.FileAppender; import ch.qos.logback.core.util.StatusPrinter;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);configureLogbackDirectly();org.slf4j.Logger log = LoggerFactory.getLogger(MainActivity.class);log.info("hello world!!");}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu);return true;}@Overrideprotected void onDestroy() {super.onDestroy();// assume SLF4J is bound to logback-classic in the current environmentLoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();loggerContext.stop();}private void configureLogbackDirectly() {// reset the default context (which may already have been initialized)// since we want to reconfigure itLoggerContext lc = (LoggerContext)LoggerFactory.getILoggerFactory();lc.reset();// setup FileAppenderPatternLayoutEncoder encoder1 = new PatternLayoutEncoder();encoder1.setContext(lc);encoder1.setPattern("%d{HH:mm:ss.SSS} [%thread] %-5level %logger{35} - %msg%n");encoder1.start();FileAppender<ILoggingEvent> fileAppender = new FileAppender<ILoggingEvent>();fileAppender.setContext(lc);fileAppender.setName("FILE");fileAppender.setFile(this.getFileStreamPath("log.txt").getAbsolutePath());fileAppender.setEncoder(encoder1);fileAppender.start();AsyncAppender asyncAppender = new AsyncAppender();asyncAppender.setContext(lc);asyncAppender.setName("ASYNC");// UNCOMMENT TO TWEAK OPTIONAL SETTINGS // // excluding caller data (used for stack traces) improves appender's performance // asyncAppender.setIncludeCallerData(false); // // set threshold to 0 to disable discarding and keep all events // asyncAppender.setDiscardingThreshold(0); // asyncAppender.setQueueSize(256); asyncAppender.addAppender(fileAppender);asyncAppender.start();// add the newly created appenders to the root logger;// qualify Logger to disambiguate from org.slf4j.Loggerch.qos.logback.classic.Logger root = (ch.qos.logback.classic.Logger) LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME);root.addAppender(asyncAppender);StatusPrinter.print(lc);} }

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轉(zhuǎn)載于:https://www.cnblogs.com/davidwang456/p/4913618.html

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