判断网络状态的工具类

    public class NetWorkUtils {

    /**
     * 判断是否有网络连接
     * @param context
     * @return boolean
     */
    public static boolean isNetworkConnected(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;
    }

    /**
     * 判断WIFI网络是否可用
     * @param context
     * @return
     */
    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;
    }

    /**
     * 判断MOBILE网络是否可用
     * @param context
     * @return
     */
    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;
    }

    /**
     * 获取当前网络连接的类型信息
     * @param context
     * @return
     */
    public static int getConnectedType(Context context) {
        if (context != null) {
            ConnectivityManager mConnectivityManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo();
            if (mNetworkInfo != null && mNetworkInfo.isAvailable()) {
                return mNetworkInfo.getType();
            }
        }
        return -1;
    }

    /**
     * 获取当前的网络状态 ：没有网络0：WIFI网络1：3G网络2：2G网络3
     *
     * @param context
     * @return
     */
    public static int getAPNType(Context context) {
        int netType = 0;
        ConnectivityManager connMgr = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
        if (networkInfo == null) {
            return netType;
        }
        int nType = networkInfo.getType();
        if (nType == ConnectivityManager.TYPE_WIFI) {
            netType = 1;// wifi
        } else if (nType == ConnectivityManager.TYPE_MOBILE) {
            int nSubType = networkInfo.getSubtype();
            TelephonyManager mTelephony = (TelephonyManager) context
                    .getSystemService(Context.TELEPHONY_SERVICE);
            if (nSubType == TelephonyManager.NETWORK_TYPE_UMTS
                    && !mTelephony.isNetworkRoaming()) {
                netType = 2;// 3G
            } else {
                netType = 3;// 2G
            }
        }
        return netType;
    }
 }