android 打开wifi并链接到制定ip,Android，在网络共享和连接到接入点时检测WiFi的本地IP和子网掩码...

Best solution I found at the moment:

令我感到困惑的是，关于网络共享的信息/界面是如此繁琐/隐藏得到，但是当你从 WifiManager 或 ConnectivityManager 获取Wifi类型的信息时却没有考虑到：它只在不在网络共享时起作用 . 我实际上已经失去了那个调查分支 .

我目前发现的最佳解决方案是使用标准Java NetworkInterface.getNetworkInterfaces() ，而不是任何Android API .

Experimentally, Android seems smart enough to set to null broadcast for network interfaces to the external mobile network . 它实际上很有意义，因为Android默默地丢弃涉及外部移动网络的UDP广播 .

// This works both in tethering and when connected to an Access Point

Enumeration interfaces = NetworkInterface.getNetworkInterfaces();

while (interfaces.hasMoreElements())

{

NetworkInterface networkInterface = interfaces.nextElement();

if (networkInterface.isLoopback())

continue; // Don't want to broadcast to the loopback interface

for (InterfaceAddress interfaceAddress : networkInterface.getInterfaceAddresses())

{

InetAddress broadcast = interfaceAddress.getBroadcast();

// InetAddress ip = interfaceAddress.getAddress();

// interfaceAddress.getNetworkPrefixLength() is another way to express subnet mask

// Android seems smart enough to set to null broadcast to

// the external mobile network. It makes sense since Android

// silently drop UDP broadcasts involving external mobile network.

if (broadcast == null)

continue;

... // Use the broadcast

}

}

对于子网掩码， getNetworkPrefixLength() 的结果可以强制转换为子网掩码 . 我直接使用了 getBroadcast() ，因为这是我的最终目标 .

此代码似乎不需要特殊权限(没有 ACCESS_WIFI_STATE 也没有 NETWORK ，只有 INTERNET ) .