Android4.4版本源码变化
一，WifiManager
新增：
1 public void setTdlsEnabled (InetAddress remoteIPAddress, boolean enable) 2 3 Enable/Disable TDLS on a specific local route. 4 5 TDLS enables two wireless endpoints to talk to each other directly without going through the access point that is managing the local network. It saves bandwidth and improves quality of the link. 6 7 This API enables/disables the option of using TDLS. If enabled, the underlying hardware is free to use TDLS or a hop through the access point. If disabled, existing TDLS session is torn down and hardware is restricted to use access point for transferring wireless packets. Default value for all routes is 'disabled', meaning restricted to use access point for transferring packets. 8 9 Parameters 10 remoteIPAddress IP address of the endpoint to setup TDLS with 11 enable true = setup and false = tear down TDLS
public void setTdlsEnabledWithMacAddress (String remoteMacAddress, boolean enable) Similar to setTdlsEnabled(InetAddress, boolean), except this version allows you to specify remote endpoint with a MAC address. Parameters remoteMacAddress MAC address of the remote endpoint such as 00:00:0c:9f:f2:ab enable true = setup and false = tear down TDLS
变更：
public DhcpInfo getDhcpInfo () Return the DHCP-assigned addresses from the last successful DHCP request, if any. Returns the DHCP information /*Change from deprecated to undeprecated.*/
TDLS简介
日前WiFi联盟推出了名为TDLS（Tunneled Direct Link Setup，通道直接链路建立）的无线标准，这项标准允许两款设备通过WiFi网络进行点对点直连，与早起提倡的WiFi Direct相似，不过功能则更加完善。
前后版源码版本差异查看：frameworks\base\docs\html\sdk\api_diff\19\changes
