android日志打印

贴代码吧，记录下，后面独立项目中使用.

  Logger类:

import android.util.Log;

import java.util.logging.Level;

/**
 * describe
 * date 2018/8/26
 */
public interface Logger {

    //正常打印
    void log(Level level, String msg);

    //异常打印
    void log(Level level, String msg, Throwable th);


    class AndroidLogger implements Logger {

        static final boolean ANDROID_LOG_AVAILABLE;
        private String tag;

        static {
            boolean android = false;
            try {
                android = Class.forName("android.util.Log") != null;
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
            ANDROID_LOG_AVAILABLE = android;
        }

        public AndroidLogger(String tag) {
            this.tag = tag;
        }

        public static boolean isAndroidLogAvailable() {
            return ANDROID_LOG_AVAILABLE;
        }

        @Override
        public void log(Level level, String msg) {
            if (level != Level.OFF) {
                Log.println(mapLevel(level), tag, msg);
            }
        }

        @Override
        public void log(Level level, String msg, Throwable th) {
            if (level != Level.OFF) {
                // That's how Log does it internally
                Log.println(mapLevel(level), tag, msg + "n" + Log.getStackTraceString(th));
            }
        }

        /**
         * 降级策略
         *
         * @param level
         * @return
         */
        protected int mapLevel(Level level) {
            int value = level.intValue();
            if (value < 800) { // below INFO
                if (value < 500) { // below FINE
                    return Log.VERBOSE;
                } else {
                    return Log.DEBUG;
                }
            } else if (value < 900) { // below WARNING
                return Log.INFO;
            } else if (value < 1000) { // below ERROR
                return Log.WARN;
            } else {
                return Log.ERROR;
            }
        }
    }


    class JavaLogger implements Logger {
        protected final java.util.logging.Logger logger;

        public JavaLogger(String tag) {
            logger = java.util.logging.Logger.getLogger(tag);
        }

        @Override
        public void log(Level level, String msg) {
            logger.log(level, msg);

        }

        @Override
        public void log(Level level, String msg, Throwable th) {
            logger.log(level, msg, th);

        }
    }

    class SystemLogger implements Logger {

        @Override
        public void log(Level level, String msg) {
            System.out.println("[" + level + "] " + msg);
        }

        @Override
        public void log(Level level, String msg, Throwable th) {
            System.out.println("[" + level + "] " + msg);
            th.printStackTrace(System.out);
        }
    }
}

 打印类

import android.os.Looper;

import java.util.logging.Level;

/**
 * describe
 * date 2018/8/26
 */
public class XLog {

    static Logger logger;
    static Level level = Level.INFO;


    static Logger getLogger() {
        if (logger != null) {
            return logger;
        } else {
            return Logger.AndroidLogger.isAndroidLogAvailable() && getMainLooper() != null
                    ? new Logger.AndroidLogger("XP-LOG") : new Logger.SystemLogger();
        }
    }

    /**
     * 主线程打印日志
     *
     * @return
     */
    static Object getMainLooper() {
        return Looper.getMainLooper();
    }

    public static void log(String msg) {
        getLogger().log(level, msg);
    }

}

最后

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