ddu-net utils

public class NetUtils {

// 网络是否可用
public static boolean isNetworkAvailable(Context context) {
    ConnectivityManager connectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivity == null) {
        return false;
    } else {
        NetworkInfo[] info = connectivity.getAllNetworkInfo();
        if (info != null) {
            for (int i = 0; i < info.length; i++) {
                if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                    return true;
                }
            }
        }
    }
    return false;
}

// 得到当前网络类型
public static String getNetWorkType(Context context) {
    ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = manager.getActiveNetworkInfo();
    int type = networkInfo.getType();
    if (type == ConnectivityManager.TYPE_WIFI) {
        return "wifi";
    } else if (type == ConnectivityManager.TYPE_MOBILE) {
        return "mobile";
    }
    return "unknow";
}

//当前网络是不是wifi
public static boolean isConnectedByWifi(Context context) {
    try {
        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo ni = manager.getActiveNetworkInfo();
        return (ni.getType() == ConnectivityManager.TYPE_WIFI ? true : false);
    } catch (Exception e) {

    }
    return false;
}

// MOBILE网络是几G网2G？3G？4G？
// 返回几就是几G网
public static int getNetWorkClass(Context context) {
    TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
    switch (telephonyManager.getNetworkType()) {
        case TelephonyManager.NETWORK_TYPE_GPRS:
        case TelephonyManager.NETWORK_TYPE_EDGE:
        case TelephonyManager.NETWORK_TYPE_CDMA:
        case TelephonyManager.NETWORK_TYPE_1xRTT:
        case TelephonyManager.NETWORK_TYPE_IDEN:
            return 2;
        case TelephonyManager.NETWORK_TYPE_UMTS:
        case TelephonyManager.NETWORK_TYPE_EVDO_0:
        case TelephonyManager.NETWORK_TYPE_EVDO_A:
        case TelephonyManager.NETWORK_TYPE_HSDPA:
        case TelephonyManager.NETWORK_TYPE_HSUPA:
        case TelephonyManager.NETWORK_TYPE_HSPA:
        case TelephonyManager.NETWORK_TYPE_EVDO_B:
        case TelephonyManager.NETWORK_TYPE_EHRPD:
        case TelephonyManager.NETWORK_TYPE_HSPAP:
            return 3;
        case TelephonyManager.NETWORK_TYPE_LTE:
            return 4;
        default:
            return 0;// unknow
    }
}

// wifi网络是否可用
public static boolean isWifiConnected(Context context) {
    if (context != null) {
        ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo mWiFiNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        if (mWiFiNetworkInfo != null) {
            return mWiFiNetworkInfo.isAvailable();
        }
    }
    return false;
}

//mobile网络是否可用
public static boolean isMobileConnected(Context context) {
    if (context != null) {
        ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo mMobileNetworkInfo = mConnectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        if (mMobileNetworkInfo != null) {
            return mMobileNetworkInfo.isAvailable();
        }
    }
    return false;
}

// 使用MOBILE网络时用来获取IP
public static String getLocalIpAddress() {
    try {
        for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
            NetworkInterface intf = (NetworkInterface) en.nextElement();
            for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
                InetAddress inetAddress = (InetAddress) enumIpAddr.nextElement();
                if (!inetAddress.isLoopbackAddress())
                    return inetAddress.getHostAddress().toString();
            }
        }
    } catch (SocketException ex) {
    }
    return "0.0.0.0";
}

// 使用Wifi时用来获取IP
public static String getWifiIpAddress(Context context) {
    WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    WifiInfo wifiInfo = wifiManager.getConnectionInfo();
    int ipAddress = wifiInfo.getIpAddress();
    return intToIp(ipAddress);
}

// 获取wifi的ssid（即wifi名称）
public static String getWifiSsid(Context context) {
    String ssidApn = "";
    try {
        WifiManager wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        WifiInfo wi = wm.getConnectionInfo();
        ssidApn = wi.getSSID();
    } catch (Exception e) {
    }
    return ssidApn;
}

// 手机GPS是否开启
public static boolean isGpsEnable(Context context) {
    LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
    return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
}

// 返回运营商名字
public static String getNetworkOperatorName(Context context) {
    TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
    return telephonyManager.getNetworkOperatorName();
}

private static String intToIp(int i) {
    return String.format("%d.%d.%d.%d", (i & 0xff), (i >> 8 & 0xff), (i >> 16 & 0xff), (i >> 24 & 0xff));
}

}
下面，又来检测一下以上的各个方法：
当手机使用WIFI时：
网络是否可用 isNetworkAvailable:true
得到当前网络类型 getNetWorkType:wifi
当前网络是不是wifi isConnectedByWifi:true
MOBILE网络是几G网 getNetWorkClass:0
wifi网络是否可用 isWifiConnected:true
mobile网络是否可用 isMobileConnected:true
使用MOBILE网络时用来获取IP getLocalIpAddress:fe80::fa:70ff:fe07:89d1%dummy0
使用Wifi时用来获取IP getWifiIpAddress:192.168.30.6
获取wifi的ssid（即wifi名称） getWifiSsid:"***aifu"
手机GPS是否开启 isGpsEnable:true
返回运营商名字 getNetworkOperatorName:中国联通
当使用MOBILE网络时：

网络是否可用 isNetworkAvailable:true
得到当前网络类型 getNetWorkType:mobile
当前网络是不是wifi isConnectedByWifi:false
MOBILE网络是几G网 getNetWorkClass:3
wifi网络是否可用 isWifiConnected:false
mobile网络是否可用 isMobileConnected:true
使用MOBILE网络时用来获取IP getLocalIpAddress:10.34.23.150
使用Wifi时用来获取IP getWifiIpAddress:0.0.0.0
获取wifi的ssid（即wifi名称） getWifiSsid:<unknown ssid>
手机GPS是否开启 isGpsEnable:true
返回运营商名字 getNetworkOperatorName:中国联通