获取当前的有效ip

private String getWifiIp() {
    WifiManager wifiManager = (WifiManager) getSystemService(
            Context.WIFI_SERVICE);
    if (!wifiManager.isWifiEnabled()) {
        Log.i("slockets", "=================");
        wifiManager.setWifiEnabled(true);
    }
    WifiInfo wifiInfo = wifiManager.getConnectionInfo();
    String IPAddress = intToIp(wifiInfo.getIpAddress());
    Log.i("slockets", "IPAddress-->>" + IPAddress);

    DhcpInfo dhcpinfo = wifiManager.getDhcpInfo();
    String serverAddress = intToIp(dhcpinfo.serverAddress);
    Log.i("slockets", "serverAddress-->>" + serverAddress);
    return IPAddress;
}

private String intToIp(int paramInt) {
    return (paramInt & 0xFF) + "." + (0xFF & paramInt >> 8) + "."
            + (0xFF & paramInt >> 16) + "." + (0xFF & paramInt >> 24);

例如：7.168.7.155，而不是路由地址7.168.7.1
}