android - 如何在 Android 3.x 或 4.x 上以编程方式配置静态 IP 地址、网络掩码、网关

Question

我已 checkin Stack Overflow 问题 API for configuring static IP addresses in an Android application .

它在 Android 2.3 之前有效。但是，在更高的 API 级别上没有运气。例如，我把设置

android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_USE_STATIC_IP, "1");        
android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_STATIC_IP, "192.168.0.100");
android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_STATIC_NETMASK, "255.255.255.0");
android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_STATIC_DNS1, "192.168.0.254");
android.provider.Settings.System.putString(getContentResolver(), android.provider.Settings.System.WIFI_STATIC_GATEWAY, "192.168.0.254");

但我回去检查:

Setting --> Wi-Fi --> Long Press Access Point SSID --> Modify Network --> check Show advanced options

IP Settings 字段仍为 DHCP 但不是 Static。

确实，我可以使用 android.provider.Settings.System.getString() 来取回我设置的内容。它证明设置保存在某处，但系统只是忽略它。

系统在 Android 3.x 和 4.x 上使用 android.provider.Settings.System 以外的设置，因为该设置是按接入点 SSID 设置的。我可以像在 Android 2.3 上一样修改一个 SSID 的设置吗？

Answer 1

我意识到 3.x 或 4.x 上没有针对每个 SSID 设置的 API。于是查看了源码，发现每个SSID的配置都存放在android.net.wifi.WifiConfiguration来自 android.net.wifi.WifiManager .

在下面的代码中，IpAssignment是一个枚举，STAIC , DHCP或 NONE .和linkProperties是对象存储IP地址、网关、DNS等...

linkAddress是 IP 地址及其网络掩码作为 prefixLength(网络掩码中有多少位 1)。

mRoutes是 ArrayList的 RouteInfo可以指示网关。

mDnses是 ArrayList的 InetAddress用于 DNS。

首先，使用 WifiConfiguration 获取当前配置SSID

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;              
    }
}

作为 IpAssignment和 linkProperties被隐藏，对象可以通过反射得到。

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，我可以设置和更新WifiConfiguration对于这个 SSID。

    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 . mGateways是 Arraylist类型 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输入。