log日志具体到某一行的实现，定位到某一个类，强大！！

xutils3有个很实用的日志输出功能，可以具体到某一行。
使用了反射（用类加载的发过获取到类的内容，如属性和方法）进行实现

 private static String generateTag() {
        StackTraceElement caller = new Throwable().getStackTrace()[2];
        String tag = "%s.%s(L:%d)";
        String callerClazzName = caller.getClassName();
        callerClazzName = callerClazzName.substring(callerClazzName.lastIndexOf(".") + 1);
        tag = String.format(tag, callerClazzName, caller.getMethodName(), caller.getLineNumber());
        tag = TextUtils.isEmpty(customTagPrefix) ? tag : customTagPrefix + ":" + tag;
        return tag;
    }

/**
 * Log工具，类似android.util.Log。
 * tag自动产生，格式: customTagPrefix:className.methodName(L:lineNumber),
 * customTagPrefix为空时只输出：className.methodName(L:lineNumber)。
 * Author: wy
 * Date: 18-3-06
 * Time: 下午17:26
 */
public class LogUtil {
    public static String customTagPrefix = "wy_log";
    private static final boolean isDebug=true;

    private LogUtil() {
    }

    private static String generateTag() {
        StackTraceElement caller = new Throwable().getStackTrace()[2];
        String tag = "%s.%s(L:%d)";
        String callerClazzName = caller.getClassName();
        callerClazzName = callerClazzName.substring(callerClazzName.lastIndexOf(".") + 1);
        tag = String.format(tag, callerClazzName, caller.getMethodName(), caller.getLineNumber());
        tag = TextUtils.isEmpty(customTagPrefix) ? tag : customTagPrefix + ":" + tag;
        return tag;
    }

    public static void d(String content) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.d(tag, content);
    }

    public static void d(String content, Throwable tr) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.d(tag, content, tr);
    }

    public static void e(String content) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.e(tag, content);
    }

    public static void e(String content, Throwable tr) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.e(tag, content, tr);
    }

    public static void i(String content) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.i(tag, content);
    }

    public static void i(String content, Throwable tr) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.i(tag, content, tr);
    }

    public static void v(String content) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.v(tag, content);
    }

    public static void v(String content, Throwable tr) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.v(tag, content, tr);
    }

    public static void w(String content) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.w(tag, content);
    }

    public static void w(String content, Throwable tr) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.w(tag, content, tr);
    }

    public static void w(Throwable tr) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.w(tag, tr);
    }


    public static void wtf(String content) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.wtf(tag, content);
    }

    public static void wtf(String content, Throwable tr) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.wtf(tag, content, tr);
    }

    public static void wtf(Throwable tr) {
        if (!isDebug) return;
        String tag = generateTag();

        Log.wtf(tag, tr);
    }

}