How can I set ProxySettings and ProxyProperties on Android Wi-Fi connection using Java?

Question

How can I set ProxySettings and ProxyProperties on an Android Wi-Fi connection using Java (programatically)?

As ipAssignment, linkProperties, ProxySettings and Proxy

Answer 1

Here is some sample code to handle the same thing in Android 5.0 following the same format as Carl's answer above.

public void setWifiProxySettings5()
{
    //get the current wifi configuration
    WifiManager manager = (WifiManager)getSystemService(Context.WIFI_SERVICE);
    WifiConfiguration config = GetCurrentWifiConfiguration(manager);
    if(null == config)
        return;     

    try
    {       
        //linkProperties is no longer in WifiConfiguration          
        Class proxyInfoClass = Class.forName("android.net.ProxyInfo");
        Class[] setHttpProxyParams = new Class[1];
        setHttpProxyParams[0] = proxyInfoClass;         
        Class wifiConfigClass = Class.forName("android.net.wifi.WifiConfiguration");
        Method setHttpProxy = wifiConfigClass.getDeclaredMethod("setHttpProxy", setHttpProxyParams);
        setHttpProxy.setAccessible(true);

        //Method 1 to get the ENUM ProxySettings in IpConfiguration
        Class ipConfigClass = Class.forName("android.net.IpConfiguration");
        Field f = ipConfigClass.getField("proxySettings");
        Class proxySettingsClass = f.getType();        

        //Method 2 to get the ENUM ProxySettings in IpConfiguration
        //Note the $ between the class and ENUM
        //Class proxySettingsClass = Class.forName("android.net.IpConfiguration$ProxySettings");

        Class[] setProxySettingsParams = new Class[1];
        setProxySettingsParams[0] = proxySettingsClass;
        Method setProxySettings = wifiConfigClass.getDeclaredMethod("setProxySettings", setProxySettingsParams);
        setProxySettings.setAccessible(true);


        ProxyInfo pi = ProxyInfo.buildDirectProxy("127.0.0.1", 8118);
        //Android 5 supports a PAC file
        //ENUM value is "PAC"
        //ProxyInfo pacInfo = ProxyInfo.buildPacProxy(Uri.parse("http://localhost/pac"));

        //pass the new object to setHttpProxy
        Object[] params_SetHttpProxy = new Object[1];
        params_SetHttpProxy[0] = pi;
        setHttpProxy.invoke(config, params_SetHttpProxy);

        //pass the enum to setProxySettings
        Object[] params_setProxySettings = new Object[1];
        params_setProxySettings[0] = Enum.valueOf((Class) proxySettingsClass, "STATIC");
        setProxySettings.invoke(config, params_setProxySettings);

        //save the settings
        manager.updateNetwork(config);
        manager.disconnect();
        manager.reconnect();
    }   
    catch(Exception e)
    {
        Log.v("wifiProxy", e.toString());
    }
}