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));

        }

    }

}