ドキュメントによると、デフォルトのログレベルをINFOからより低いレベル（DEBUGなど）に変更する方法は2つしかありません。
setprop log.tag.<YOUR_LOG_TAG> <LEVEL>、 またlog.tag.<YOUR_LOG_TAG>=<LEVEL>/data/local.propにあります。アプリケーション内にロギング構成をバンドルすることは可能ですか？アプリケーションにバンドルされており、ロード時のロギング動作を変更する、またはと同等の構成ファイルをlogging.properties探しています。logback.xml目標は、アプリケーションが実行される各デバイスを手動で構成することを回避することです。
私はlogback-androidを使用することになりました。誰かがより良い解決策を思いついた場合に備えて、この質問はもう少し開いたままにしておきます。
ここでもいくつかのカスタマイズでJavaロガーを使用できます。
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);
}
}
}
クラスLoggerFactory.javaを作成します
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);
}
}
列挙型LogLevel.javaを作成します
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;
}
}
}
また、Strings.xmlを次のように更新する必要があります。
<!--
:-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>
アプリケーションの開始から、次のようにロガーを初期化します。
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);
ログを印刷するには、次のように記述します。
Log.info(" message ");
Log.fine(" message ");
Log.severe(" message ");
Log.warning(" message ");