Get the adapter type information from Android OS.

talk/app/webrtc/java/jni/androidnetworkmonitor_jni.h

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 59 matching lines @@
 
   static void SetAndroidContext(JNIEnv* jni, jobject context);
 
   void Start() override;
   void Stop() override;
 
   int BindSocketToNetwork(int socket_fd,
                           const rtc::IPAddress& address) override;
   void OnNetworkAvailable(const NetworkInformation& network_info);
 
+  rtc::AdapterType GetAdapterType(const std::string& if_name) override;
+
  private:
+  void UpdateNetworkInfos();
+  void GetAllNetworkInfos(std::vector<NetworkInformation>* network_infos);

[Taylor Brandstetter, 2016/01/20 01:51:57]

This method could simply return an std::vector, and rely on compiler
optimization to avoid extra copies being made.

[honghaiz3, 2016/01/21 21:38:36]

Thanks! Good to know that. 

   JNIEnv* jni() { return AttachCurrentThreadIfNeeded(); }
 
   void OnNetworkAvailable_w(const NetworkInformation& network_info);
 
   ScopedGlobalRef<jclass> j_network_monitor_class_;
   ScopedGlobalRef<jobject> j_network_monitor_;
   rtc::ThreadChecker thread_checker_;
   static jobject application_context_;
   bool started_ = false;
+  std::map<std::string, rtc::AdapterType> adapter_types_;

[pthatcher1, 2016/01/19 02:13:07]

What is the key here?

[honghaiz3, 2016/01/21 21:38:36]

Interface name. changed name.

   std::map<rtc::IPAddress, NetworkInformation> network_info_by_address_;
 };
 
 class AndroidNetworkMonitorFactory : public rtc::NetworkMonitorFactory {
  public:
   AndroidNetworkMonitorFactory() {}
 
   rtc::NetworkMonitorInterface* CreateNetworkMonitor() override;
 };
 
 }  // namespace webrtc_jni
 
 #endif  // TALK_APP_WEBRTC_JAVA_JNI_ANDROIDNETWORKMONITOR_JNI_H_