无法在Android 2.2上检索dhcp信息

Question

我在Nexus One上的Android 4.0.3上运行此代码：

WifiManager wifi = (WifiManager) getSystemService(WIFI_SERVICE); 
        DhcpInfo info = wifi.getDhcpInfo();
        String s_gateway = String.valueOf(info.gateway); 
        String gatewayString = intToIp(Integer.parseInt(s_gateway));
        Log.d("DHCP Info: ", s_gateway+"");
        Log.d("DHCP Info: ", gatewayString+"");

它正确地返回我的网关（PC + Connectify）。

但Android 2.2上的相同代码返回0.0.0.0。怎么了？

Answer 1

我修复它的方式：

private String intToIp(int i) {
    return ( i & 0xFF) + "." +
        (( i >> 8 ) & 0xFF) + "." +
        (( i >> 16 ) & 0xFF) + ".1";// +
        //(( i >> 24 ) & 0xFF);
}

WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
    WifiInfo wifiInfo = wifiManager.getConnectionInfo();
    int ipAddress = wifiInfo.getIpAddress();
    gatewayString = intToIp(ipAddress);