這是一個從XUtils3中摘抄出來的打印日誌工具類。這個類打印日誌比較詳細，可以打印類名、方法名。
isDebug為打印日誌開關，初始化的時候可以使用LogUtils.isDebug(boolean b)來控制開關狀態。

public class LogUtils {

    public static String customTagPrefix = "x_log";
    private static boolean isDebug = true;

    private LogUtils() {
    }

    public static void isDebug(boolean b) {
        isDebug = b;
    }

    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);
    }

}
 

Android LogUtils打印日誌工具類