public void json(String json) {
        if (LogLevel.DEBUG < logConfiguration.logLevel) {
            return;
        }
        printlnInternal(LogLevel.DEBUG, logConfiguration.jsonFormatter.format(json));
    }
Log a JSON string, with level {@link LogLevel#DEBUG} by default.

@param json the JSON string to log
android/android_framework/base/src/main/java/com/elvishew/xlog/Logger.java