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copied!<p>I realise that there is no API on 3.x or 4.x for those setting per SSID. Therefore, I checked out the source code and found out that the configuration of each SSID is stored in <code>android.net.wifi.WifiConfiguration</code> which is gotten from <code>android.net.wifi.WifiManager</code>.</p> <p>In the below code, <code>IpAssignment</code> is an Enum, either <code>STAIC</code>, <code>DHCP</code> or <code>NONE</code>. And <code>linkProperties</code> is the object store IP address, gateway, DNS, etc...</p> <p><code>linkAddress</code> is IP address and its netmask as prefixLength (how many bit 1 in netmask).</p> <p><code>mRoutes</code> is <code>ArrayList</code> of <code>RouteInfo</code> that can indicate gateway.</p> <p><code>mDnses</code> is <code>ArrayList</code> of <code>InetAddress</code> for DNS.</p> <p>Firstly, get the current configuration using <code>WifiConfiguration</code> SSID</p> <pre><code>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; } } </code></pre> <p>As the <code>IpAssignment</code> and <code>linkProperties</code> are hidden, the object can be gotten from reflection.</p> <p>The following method can set the declared IP address setting on SSID WifiConfiguration:</p> <pre><code> 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)); } </code></pre> <p>After that, I can set setting and update <code>WifiConfiguration</code> for this SSID. </p> <pre><code> 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(); } </code></pre> <p>Edit: Sorry for I don't check for Android 3.x device that have silmilar UI with Android 4.x. In Android 3.x, the gateway is storted in <code>mGateways</code> of <code>linkProperties</code>. <code>mGateways</code> is <code>Arraylist</code> of type <code>InetAddress</code>. Therefore, following should work in Android 3.x.</p> <pre><code>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); } </code></pre> <p>Edit2: The methods <code>setIpAddress</code>, <code>setGateway</code>, <code>setDNS</code> should be inputted as <code>InetAddress</code> type.</p>

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