NetworkUtil

public class NetworkUtil {
    /**
     * 檢查網絡是否連接
     *
     * @param context 全局context
     * @return true 已連接 false 未連接
     */
    public static Boolean checkNetworkConnect(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
            if (mNetworkInfo != null) {
                return mNetworkInfo.isAvailable();
            }
        }

        return false;
    }

    /**
     * 獲取當前的網絡狀態
     *
     * @param context 全局context
     * @return 沒有網絡-NO
     * WIFI網絡-WIFI
     * 4G網絡-4G
     * 3G網絡-3G
     * 2G網絡-2G
     * 未知-Unknown
     */
    public static String getAPNType(Context context) {
        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();
        if (networkInfo == null) {      //無網絡
            return "NO";
        }

        int nType = networkInfo.getType();
        if (nType == ConnectivityManager.TYPE_WIFI) {       //wifi
            return "WIFI";
        } else if (nType == ConnectivityManager.TYPE_MOBILE) {
            int nSubType = networkInfo.getSubtype();
            TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
            if (nSubType == TelephonyManager.NETWORK_TYPE_LTE
                    && !telephonyManager.isNetworkRoaming()) {
                return "4G";
            } else if (nSubType == TelephonyManager.NETWORK_TYPE_UMTS
                    || nSubType == TelephonyManager.NETWORK_TYPE_EVDO_0
                    || nSubType == TelephonyManager.NETWORK_TYPE_EVDO_A
                    || nSubType == TelephonyManager.NETWORK_TYPE_HSDPA
                    || nSubType == TelephonyManager.NETWORK_TYPE_HSUPA
                    || nSubType == TelephonyManager.NETWORK_TYPE_HSPA
                    || nSubType == TelephonyManager.NETWORK_TYPE_EVDO_B
                    || nSubType == TelephonyManager.NETWORK_TYPE_EHRPD
                    || nSubType == TelephonyManager.NETWORK_TYPE_HSPAP
                    && !telephonyManager.isNetworkRoaming()) {
                return "3G";
            } else if (nSubType == TelephonyManager.NETWORK_TYPE_GPRS
                    || nSubType == TelephonyManager.NETWORK_TYPE_EDGE
                    || nSubType == TelephonyManager.NETWORK_TYPE_CDMA
                    || nSubType == TelephonyManager.NETWORK_TYPE_1xRTT
                    || nSubType == TelephonyManager.NETWORK_TYPE_IDEN
                    && !telephonyManager.isNetworkRoaming()) {
                return "2G";
            } else {
                return "Unknown";
            }
        }

        return "Unknown";
    }
}