text: //
  // Copyright(c) 2015 Gabi Melman.
  // Distributed under the MIT License (http://opensource.org/licenses/MIT)
  //
  
  #pragma once
  
  #include "spdlog/details/fmt_helper.h"
  #include "spdlog/details/null_mutex.h"
  #include "spdlog/details/os.h"
  #include "spdlog/sinks/base_sink.h"
  
  #include <android/log.h>
  #include <chrono>
  #include <mutex>
  #include <string>
  #include <thread>
  
  #if !defined(SPDLOG_ANDROID_RETRIES)
  #define SPDLOG_ANDROID_RETRIES 2
  #endif
  
  namespace spdlog {
  namespace sinks {
  
  /*
   * Android sink (logging using __android_log_write)
   */
  template<typename Mutex>
  class android_sink final : public base_sink<Mutex>
  {
  public:
      explicit android_sink(std::string tag = "spdlog", bool use_raw_msg = false)
          : tag_(std::move(tag))
          , use_raw_msg_(use_raw_msg)
      {
      }
  
  protected:
      void sink_it_(const details::log_msg &msg) override
      {
          const android_LogPriority priority = convert_to_android_(msg.level);
          fmt::memory_buffer formatted;
          if (use_raw_msg_)
          {
              details::fmt_helper::append_buf(msg.raw, formatted);
          }
          else
          {
              sink::formatter_->format(msg, formatted);
          }
          formatted.push_back('\0');
          const char *msg_output = formatted.data();
  
          // See system/core/liblog/logger_write.c for explanation of return value
          int ret = __android_log_write(priority, tag_.c_str(), msg_output);
          int retry_count = 0;
          while ((ret == -11 /*EAGAIN*/) && (retry_count < SPDLOG_ANDROID_RETRIES))
          {
              details::os::sleep_for_millis(5);
              ret = __android_log_write(priority, tag_.c_str(), msg_output);
              retry_count++;
          }
  
          if (ret < 0)
          {
              throw spdlog_ex("__android_log_write() failed", ret);
          }
      }
  
      void flush_() override {}
  
  private:
      static android_LogPriority convert_to_android_(spdlog::level::level_enum level)
      {
          switch (level)
          {
          case spdlog::level::trace:
              return ANDROID_LOG_VERBOSE;
          case spdlog::level::debug:
              return ANDROID_LOG_DEBUG;
          case spdlog::level::info:
              return ANDROID_LOG_INFO;
          case spdlog::level::warn:
              return ANDROID_LOG_WARN;
          case spdlog::level::err:
              return ANDROID_LOG_ERROR;
          case spdlog::level::critical:
              return ANDROID_LOG_FATAL;
          default:
              return ANDROID_LOG_DEFAULT;
          }
      }
  
      std::string tag_;
      bool use_raw_msg_;
  };
  
  using android_sink_mt = android_sink<std::mutex>;
  using android_sink_st = android_sink<details::null_mutex>;
  } // namespace sinks
  
  // Create and register android syslog logger
  
  template<typename Factory = default_factory>
  inline std::shared_ptr<logger> android_logger_mt(const std::string &logger_name, const std::string &tag = "spdlog")
  {
      return Factory::template create<sinks::android_sink_mt>(logger_name, tag);
  }
  
  template<typename Factory = default_factory>
  inline std::shared_ptr<logger> android_logger_st(const std::string &logger_name, const std::string &tag = "spdlog")
  {
      return Factory::template create<sinks::android_sink_st>(logger_name, tag);
  }
  
  } // namespace spdlog
  