一个好用的Log管理类

public class L {
    private static String className;            //所在的类名
    private static String methodName;            //所在的方法名
    private static int lineNumber;                //所在行号
    
    public static final int VERBOSE = 1;          //显示Verbose及以上的Log
    public static final int DEBUG = 2;            //显示Debug及以上的Log
    public static final int INFO = 3;            //显示Info及以上的Log
    public static final int WARN = 4;            //显示Warn及以上的Log
    public static final int ERROR = 5;            //显示Error及以上的Log
    public static final int NOTHING = 6;        //全部不显示
    
    public static final int LEVEL = NOTHING;    //控制显示的级别

    private L() {
    }

    public static boolean isDebuggable() {
        return BuildConfig.DEBUG;
    }

    private static String createLog(String log) {

        StringBuffer buffer = new StringBuffer();
        buffer.append("[");
        buffer.append(methodName);
        buffer.append(":");
        buffer.append(lineNumber);
        buffer.append("]");
        buffer.append(log);

        return buffer.toString();
    }

    private static void getMethodNames(StackTraceElement[] sElements) {
        className = sElements[1].getFileName();
        methodName = sElements[1].getMethodName();
        lineNumber = sElements[1].getLineNumber();
    }
    
    public static void v(String message) {
        if (!isDebuggable()) {
            return;
        }

        if (LEVEL <= VERBOSE) {
            getMethodNames(new Throwable().getStackTrace());
            Log.v(className, createLog(message));
        }
    }

    public static void d(String message) {
        if (!isDebuggable()) {
            return;
        }

        if (LEVEL <= DEBUG) {
            getMethodNames(new Throwable().getStackTrace());
            Log.d(className, createLog(message));
        }
    }

    public static void i(String message) {
        if (!isDebuggable()) {
            return;
        }

        if (LEVEL <= INFO) {
            getMethodNames(new Throwable().getStackTrace());
            Log.i(className, createLog(message));
        }
    }

    public static void w(String message) {
        if (!isDebuggable()) {
            return;
        }

        if (LEVEL <= WARN) {
            getMethodNames(new Throwable().getStackTrace());
            Log.w(className, createLog(message));
        }
    }
    
    public static void e(String message) {
        if (!isDebuggable()) {
            return;
        }

        if (LEVEL <= ERROR) {
            getMethodNames(new Throwable().getStackTrace());
            Log.e(className, createLog(message));
        }
    }
}

原文地址：http://www.devwiki.net/2015/06/24/Android-New-Log/