Android：如何更改默認日誌記錄級別？

Question

根據the documentation只有兩種方法可以從INFO更改默認記錄級別到較低的水平（如DEBUG）：

1. setprop log.tag.<YOUR_LOG_TAG> <LEVEL>，或
2. 在/data/local.prop log.tag.<YOUR_LOG_TAG>=<LEVEL>。

是否可以在應用程序中綁定日誌記錄配置？我正在尋找相當於logging.properties或logback.xml的配置文件，這些配置文件與應用程序捆綁在一起，並在加載時改變日誌記錄行爲。目標是避免手動配置應用程序將運行的每個設備。

Answer 1

我結束了使用logback-android。如果有人想出一個更好的解決方案，我會把這個問題延長一段時間。

Answer 2

您還可以在這裏用java記錄一些的定製..

ConsoleLogHandler.java

package com.sony.evc.vis.system.util.logger; 

import java.util.logging.Handler; 
import java.util.logging.Level; 
import java.util.logging.LogRecord; 

import android.util.Log; 

public class ConsoleLogHandler extends Handler 
{ 

    @Override 
    public void close() 
    {} 

    @Override 
    public void flush() 
    {} 

    // filter logs and publish them 
    @Override 
    public void publish(LogRecord record) 
    { 
     String className = record.getLoggerName() + ": " 
       + simplifyClassName(record.getSourceClassName()); 
     int threadID = record.getThreadID(); 
     String methodName = record.getSourceMethodName(); 
     String msg = record.getMessage(); 
     int level = record.getLevel().intValue(); 

     logMessage(className, threadID, methodName, msg, level, record.getThrown()); 
    } 

    // simplify class name from full applied package name to simple class 
    private String simplifyClassName(String sourceClassName) 
    { 
     String fullClassName[] = sourceClassName.split("\\."); 
     return fullClassName[fullClassName.length - 1]; 
    } 

    private void logMessage(String className, int threadID, String methodName, String msg, 
      int level, Throwable throwable) 
    { 
     if (level == Level.FINE.intValue()) { 
      Log.d(className, "ThreadID:" + threadID + "," + methodName + "()," + msg); 
     } 
     else if (level == Level.INFO.intValue()) { 
      Log.i(className, "ThreadID:" + threadID + "," + methodName + "()," + msg); 
     } 
     else if (level == Level.WARNING.intValue()) { 
      Log.w(className, "ThreadID:" + threadID + "," + methodName + "()," + msg, throwable); 
     } 
     else if (level == Level.SEVERE.intValue()) { 
      Log.e(className, "ThreadID:" + threadID + "," + methodName + "()," + msg, throwable); 
     } 

    } 

} 

---

創建類LoggerFactory.java

package com.sony.evc.vis.system.util.logger; 

import java.util.logging.Handler; 
import java.util.logging.Level; 
import java.util.logging.Logger; 

public class LoggerFactory { 

    public static Logger Log; 
    private static ConsoleLogHandler logHandler; 
    // Global constants to give programmer choice to add if condition before 
    // logging a code. 
    public static boolean FINE; 
    public static boolean INFO; 
    public static boolean WARN; 

    // initialise the logger 
    public static void init(String version, String globalDebugLevel, 
      String appDebugLevel) { 

     Log = Logger.getLogger(version); 

     // debug level settings 
     Level debuglevel = LogLevel.setDebugLevel(globalDebugLevel, 
       appDebugLevel); 
     if (debuglevel.equals(Level.ALL) || debuglevel.equals(Level.FINE) 
       || debuglevel.equals(Level.FINER) 
       || debuglevel.equals(Level.FINEST)) { 
      FINE = INFO = WARN = true; 
     } else if (debuglevel.equals(Level.INFO)) { 
      INFO = WARN = true; 
     } else if (debuglevel.equals(Level.WARNING)) { 
      WARN = true; 
     } 
     Log.setLevel(debuglevel); 

     // logger send its msg to several handlers by default, we have to 
     // disable that 
     Log.setUseParentHandlers(false); 

     // avoid recreation of handler in case activities onCreate() is called 
     // again but logHandler is not 
     // garbage collected 
     if (logHandler == null) 
      logHandler = new ConsoleLogHandler(); 

     // remove previously assigned handlers. This is very important and 
     // failing to do so may result in 
     // duplication of same logs 
     for (Handler handler : Log.getHandlers()) 
      Log.removeHandler(handler); 

     // set this loggers handler and make sure that only one instance is 
     // associated with it 
     Log.addHandler(logHandler); 
    } 
} 

---

創建枚舉LogLevel.java

package com.sony.evc.vis.system.util.logger; 

import java.util.logging.Level; 

public enum LogLevel { 
    DEBUG, INFO, WARNING, ERROR, NO_LOG, DISABLE; 
    /* 
    * set log-debugLevel as per requirement. Global level is given preference 
    * over app and service levels. If global level is disabled, other 
    * levels are considered 
    */ 
    public static Level setDebugLevel(String sGlobalDebugLevel, 
      String sAppDebugLevel) { 
     String strGlobalDebugLevel = sGlobalDebugLevel.trim().toUpperCase(); 
     String strAppDebugLevel = sAppDebugLevel.trim().toUpperCase(); 
     LogLevel globalDebugLevel = LogLevel.valueOf(strGlobalDebugLevel); 
     LogLevel appDebugLevel = LogLevel.valueOf(strAppDebugLevel); 
     LogLevel logLevel = globalDebugLevel == LogLevel.DISABLE ? appDebugLevel 
       : globalDebugLevel; 

     switch (logLevel) { 
     case DEBUG: 
      return Level.FINE; 
     case INFO: 
      return Level.INFO; 
     case WARNING: 
      return Level.WARNING; 
     case ERROR: 
      return Level.SEVERE; 
     case NO_LOG: 
      return Level.OFF; 
     case DISABLE: 
      return Level.OFF; 
     default: 
      return Level.INFO; 
     } 
    } 
} 

---

你也將需要更新的strings.xml爲

<!-- 
    :-Accepted values for global_debuglevel are: "debug", "info", "warning", "error"(in increasing order of priority),No_Log 
     and Disable. 
    :-Setting any other value will set "info" level 
    --> 
    <string name="global_debuglevel">debug</string> 

    <!-- 
    :-Accepted values for app_debuglevel are: "debug", "info", "warning", "error"(in increasing order of priority) 
     and No_Log 
    :-Setting any other value will set "info" level 
    --> 
    <string name="app_debuglevel">debug</string> 

---

從應用程序的啓動只是初始化記錄儀as

String service_version = getString(R.string.service_version); 
    String global_debugLevel = getString(R.string.global_debuglevel); 
    String service_debugLevel = getString(R.string.service_debuglevel); 
    LoggerFactory.init(service_version, global_debugLevel, 
      service_debugLevel); 

---

對於打印日誌寫：

Log.info(" message "); 
Log.fine(" message "); 
Log.severe(" message "); 
Log.warning(" message ");