有一个项目，要控制设备wifi连接，而且要使用静态ip，上网查找了下，基本都是Android2.X下面的方法，即使用Settings进行设置，但是这种设置方法对于Android3.X以上设备是无效的，通过研究在Android手机上手动设置静态ip，我们可以发现：

1、Android2.X系统下面，静态IP地址是一个全局设置，即设置好之后会对你以后连接的所有热点生效，都会使用你设置的IP地址

2、Android3.X以上系统，设置静态ip是针对每一个点连接的配置进行的，在热点1上的设置不会影响热点2

ok，基本明白了，Android2.X使用Settings进行设置，是一个全局设定，而之后的系统做了修改，更改了设置模式，将静态ip设置与每一个热点挂钩，那会不会是在热点的配置类里面实现的呢，为了验证，我们查看了Android4.0的sdk源码，分析完WifiConfiguration.java后，就明白了，里面有“ipAssignment”，“linkProperties”，"mRoutes"(3.x系统为“mGateways”)等多个新增的hidden项，看来只能通过反射的方法调用了，呵呵，下面上代码：

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01.//******************************************************************************/

02.    //以下代码为android3.0及以上系统设置静态ip地址的方法

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01.

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01./*设置ip地址类型 assign：STATIC/DHCP 静态/动态*/

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01.    private static void setIpAssignment(String assign, WifiConfiguration wifiConf)

02.        throws SecurityException, IllegalArgumentException,

03.        NoSuchFieldException, IllegalAccessException {

04.    setEnumField(wifiConf, assign, "ipAssignment");

05.}

06.

07.@SuppressWarnings("unchecked")

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01./*设置ip地址*/

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01.    private static void setIpAddress(InetAddress addr, int prefixLength,

02.            WifiConfiguration wifiConf) throws SecurityException,

03.            IllegalArgumentException, NoSuchFieldException,

04.            IllegalAccessException, NoSuchMethodException,

05.            ClassNotFoundException, InstantiationException,

06.            InvocationTargetException {

07.        Object linkProperties = getField(wifiConf, "linkProperties");

08.        if (linkProperties == null)

09.            return;

10.        Class> laClass = Class.forName("android.net.LinkAddress");

11.        Constructor> laConstructor = laClass.getConstructor(new Class[] {

12.                InetAddress.class, int.class });

13.        Object linkAddress = laConstructor.newInstance(addr, prefixLength);

14.

15.        ArrayListmLinkAddresses = (ArrayList) getDeclaredField(

16.                linkProperties, "mLinkAddresses");

17.        mLinkAddresses.clear();

18.        mLinkAddresses.add(linkAddress);

19.    }

20.

21.        @SuppressWarnings("unchecked")/*设置网关*/

22.    private static void setGateway(InetAddress gateway,

23.            WifiConfiguration wifiConf) throws SecurityException,

24.            IllegalArgumentException, NoSuchFieldException,

25.            IllegalAccessException, ClassNotFoundException,

26.            NoSuchMethodException, InstantiationException,

27.            InvocationTargetException {

28.        Object linkProperties = getField(wifiConf, "linkProperties");

29.        if (linkProperties == null)

30.            return;

31.

32.        if (android.os.Build.VERSION.SDK_INT >= 14) { // android4.x版本

33.            Class> routeInfoClass = Class.forName("android.net.RouteInfo");

34.            Constructor> routeInfoConstructor = routeInfoClass

35.                    .getConstructor(new Class[] { InetAddress.class });

36.            Object routeInfo = routeInfoConstructor.newInstance(gateway);

37.

38.            ArrayListmRoutes = (ArrayList) getDeclaredField(

39.                    linkProperties, "mRoutes");

40.            mRoutes.clear();

41.            mRoutes.add(routeInfo);

42.        } else { // android3.x版本

43.            ArrayListmGateways = (ArrayList) getDeclaredField(

44.                    linkProperties, "mGateways");

45.            mGateways.clear();

46.            mGateways.add(gateway);

47.        }

48.

49.    }

50.

51.

52.        @SuppressWarnings("unchecked")/*设置域名解析服务器*/

53. private static void setDNS(InetAddress dns, WifiConfiguration wifiConf)throws SecurityException, IllegalArgumentException,NoSuchFieldException, IllegalAccessException

54. {Object linkProperties = getField(wifiConf, "linkProperties");if (linkProperties == null)return;ArrayListmDnses = (ArrayList) getDeclaredField(linkProperties, "mDnses");mDnses.clear(); // 清除原有DNS设置(如果只想增加，不想清除，词句可省略)mDnses.add(dns);

55. //增加新的DNS}private 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;}private static Object

56. 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;}@SuppressWarnings({

57. "unchecked", "rawtypes" })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)

58. f.getType(), value));} //***以上是android3.x以上设置静态ip地址的方法*********************************************************************************

59.

60.

61.

62.

63.

下面是调用方法：

64.private void setIpWithTfiStaticIp() {

65.

66.        WifiConfiguration wifiConfig;

67.

68.        WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);

69.        WifiInfo connectionInfo = wifiManager.getConnectionInfo();

70.        ListconfiguredNetworks = wifiManager

71.                .getConfiguredNetworks();

72.        for (WifiConfiguration conf : configuredNetworks) {

73.            if (wifiConf.networkId == connectionInfo.getNetworkId()) {

74.                WifiConf = conf;

75.                break;

76.            }

77.        }

78.

79.        if (android.os.Build.VERSION.SDK_INT < 11) { // 如果是android2.x版本的话

80.

81.            ContentResolver ctRes = context.getContentResolver();

82.            Settings.System

83.                    .putInt(ctRes, Settings.System.WIFI_USE_STATIC_IP, 1);

84.            Settings.System.putString(ctRes, Settings.System.WIFI_STATIC_IP,

85.                    "192.168.0.202");

86.            Settings.System.putString(ctRes,

87.                    Settings.System.WIFI_STATIC_NETMASK, "255.255.255.0");

88.            Settings.System.putString(ctRes,

89.                    Settings.System.WIFI_STATIC_GATEWAY, "192.168.0.1");

90.            Settings.System.putString(ctRes, Settings.System.WIFI_STATIC_DNS1,

91.                    "192.168.0.1");

92.            Settings.System.putString(ctRes, Settings.System.WIFI_STATIC_DNS2,

93.                    "61.134.1.9");

94.

95.        } else { // 如果是android3.x版本及以上的话

96.            try {

97.                setIpAssignment("STATIC", wifiConfig);

98.                setIpAddress(InetAddress.getByName("192.168.0.202"), 24,

99.                        wifiConfig);

100.                setGateway(InetAddress.getByName("192.168.0.1"), wifiConfig);

101.                setDNS(InetAddress.getByName("192.168.0.1"), wifiConfig);

102.                wifiManager.updateNetwork(wifiConfig); // apply the setting

103.                System.out.println("静态ip设置成功！");

104.            } catch (Exception e) {

105.                e.printStackTrace();

106.                System.out.println("静态ip设置失败！");

107.            }

108.        }

109.

110.    }