我意识到 3.x 或 4.x 上没有针对每个 SSID 设置的 API。于是，我查看了源码，发现每个SSID的配置都存放在android.net.wifi.WifiConfiguration中，android.net.wifi.WifiConfiguration是从android.net.wifi.WifiManager获取的。
在下面的代码中，IpAssignment 是一个枚举，STAIC、DHCP 或 NONE。
而linkProperties是对象存储IP地址、网关、DNS等...
linkAddress 是 IP 地址，其网络掩码为 prefixLength（网络掩码中有多少位 1）。
mRoutes 是ArrayList 的RouteInfo 可以表示网关。
mDnses 是 DNS 的 ArrayList 和 InetAddress。
首先，使用WifiConfigurationSSID获取当前配置
WifiConfiguration wifiConf = null;
WifiManager wifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE);
WifiInfo connectionInfo = wifiManager.getConnectionInfo();
List<WifiConfiguration> configuredNetworks = wifiManager.getConfiguredNetworks();
for (WifiConfiguration conf : configuredNetworks){
if (conf.networkId == connectionInfo.getNetworkId()){
wifiConf = conf;
break;
}
}
由于IpAssignment和linkProperties是隐藏的，所以可以通过反射获取对象。
以下方法可以设置SSID WifiConfiguration上声明的IP地址设置：
public static void setIpAssignment(String assign , WifiConfiguration wifiConf)
throws SecurityException, IllegalArgumentException, NoSuchFieldException, IllegalAccessException{
setEnumField(wifiConf, assign, "ipAssignment");
}
public static void setIpAddress(InetAddress addr, int prefixLength, WifiConfiguration wifiConf)
throws SecurityException, IllegalArgumentException, NoSuchFieldException, IllegalAccessException,
NoSuchMethodException, ClassNotFoundException, InstantiationException, InvocationTargetException{
Object linkProperties = getField(wifiConf, "linkProperties");
if(linkProperties == null)return;
Class laClass = Class.forName("android.net.LinkAddress");
Constructor laConstructor = laClass.getConstructor(new Class[]{InetAddress.class, int.class});
Object linkAddress = laConstructor.newInstance(addr, prefixLength);
ArrayList mLinkAddresses = (ArrayList)getDeclaredField(linkProperties, "mLinkAddresses");
mLinkAddresses.clear();
mLinkAddresses.add(linkAddress);
}
public static void setGateway(InetAddress gateway, WifiConfiguration wifiConf)
throws SecurityException, IllegalArgumentException, NoSuchFieldException, IllegalAccessException,
ClassNotFoundException, NoSuchMethodException, InstantiationException, InvocationTargetException{
Object linkProperties = getField(wifiConf, "linkProperties");
if(linkProperties == null)return;
Class routeInfoClass = Class.forName("android.net.RouteInfo");
Constructor routeInfoConstructor = routeInfoClass.getConstructor(new Class[]{InetAddress.class});
Object routeInfo = routeInfoConstructor.newInstance(gateway);
ArrayList mRoutes = (ArrayList)getDeclaredField(linkProperties, "mRoutes");
mRoutes.clear();
mRoutes.add(routeInfo);
}
public static void setDNS(InetAddress dns, WifiConfiguration wifiConf)
throws SecurityException, IllegalArgumentException, NoSuchFieldException, IllegalAccessException{
Object linkProperties = getField(wifiConf, "linkProperties");
if(linkProperties == null)return;
ArrayList<InetAddress> mDnses = (ArrayList<InetAddress>)getDeclaredField(linkProperties, "mDnses");
mDnses.clear(); //or add a new dns address , here I just want to replace DNS1
mDnses.add(dns);
}
public static Object getField(Object obj, String name)
throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException{
Field f = obj.getClass().getField(name);
Object out = f.get(obj);
return out;
}
public static Object getDeclaredField(Object obj, String name)
throws SecurityException, NoSuchFieldException,
IllegalArgumentException, IllegalAccessException {
Field f = obj.getClass().getDeclaredField(name);
f.setAccessible(true);
Object out = f.get(obj);
return out;
}
private static void setEnumField(Object obj, String value, String name)
throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException{
Field f = obj.getClass().getField(name);
f.set(obj, Enum.valueOf((Class<Enum>) f.getType(), value));
}
之后，我可以为这个 SSID 设置和更新WifiConfiguration。
try{
setIpAssignment("STATIC", wifiConf); //or "DHCP" for dynamic setting
setIpAddress(InetAddress.getByName("192.168.0.100"), 24, wifiConf);
setGateway(InetAddress.getByName("4.4.4.4"), wifiConf);
setDNS(InetAddress.getByName("4.4.4.4"), wifiConf);
wifiManager.updateNetwork(wifiConf); //apply the setting
wifiManager.saveConfiguration(); //Save it
}catch(Exception e){
e.printStackTrace();
}
编辑：
抱歉，我不检查具有与 Android 4.x 类似 UI 的 Android 3.x 设备。
在 Android 3.x 中，网关存储在 mGateways 的 linkProperties 中。
mGateways 是 Arraylist 类型的 InetAddress。因此，以下应该适用于 Android 3.x。
public static void setGateway(InetAddress gateway, WifiConfiguration wifiConf)
throws SecurityException, IllegalArgumentException, NoSuchFieldException, IllegalAccessException,
ClassNotFoundException, NoSuchMethodException, InstantiationException, InvocationTargetException{
Object linkProperties = getField(wifiConf, "linkProperties");
if(linkProperties == null)return;
ArrayList mGateways = (ArrayList)getDeclaredField(linkProperties, "mGateways");
mGateways.clear();
mGateways.add(gateway);
}
Edit2：方法setIpAddress、setGateway、setDNS应输入为InetAddress类型。