Android网络的工具类

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Android网络的工具类

判断是否断网
获取当前网络状态
 /**     * 获取ConnectivityManager.     *     * @param context 上下文信息     * @return 上下文信息中获取的ConnectivityManager     */    private static ConnectivityManager getConnectivityManager(final Context context) {        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        return connectivityManager;    }    /**     * 获取活动的NetworkInfo.     *     * @param context Context     * @return Active networkInfo     */    public static NetworkInfo getActiveNetworkInfo(final Context context) {        ConnectivityManager connectivityManager = getConnectivityManager(context);        NetworkInfo networkInfo = null;        if (connectivityManager != null) {            networkInfo = connectivityManager.getActiveNetworkInfo();        }        return networkInfo;    }    /**     * 检测网络是否可用.     *     * @param context Context     * @return ture -- 网络可用, false -- 网络不可用     */    public static boolean isNetworkAvailable(final Context context) {        if (context == null) {            throw new NullPointerException("context不能为空");        }        NetworkInfo networkInfo = getActiveNetworkInfo(context);        return networkInfo != null && networkInfo.isConnectedOrConnecting();    }    /**     * 获取用户的网络状态     *     * @return     */    public static String getDeviceNetworkStatus(Context context) {        String strNetworkType = "";        NetworkInfo networkInfo = ((ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE)).getActiveNetworkInfo();        if (networkInfo != null && networkInfo.isConnected()) {            if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {                strNetworkType = "WIFI";            } else if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {                String _strSubTypeName = networkInfo.getSubtypeName();                // TD-SCDMA   networkType is 17                int networkType = networkInfo.getSubtype();                switch (networkType) {                    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: //api<8 : replace by 11                        strNetworkType = "2G";                        break;                    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: //api<9 : replace by 14                    case TelephonyManager.NETWORK_TYPE_EHRPD:  //api<11 : replace by 12                    case TelephonyManager.NETWORK_TYPE_HSPAP:  //api<13 : replace by 15                        strNetworkType = "3G";                        break;                    case TelephonyManager.NETWORK_TYPE_LTE:    //api<11 : replace by 13                        strNetworkType = "4G";                        break;                    default:                        // http://baike.baidu.com/item/TD-SCDMA 中国移动 联通 电信 三种3G制式                        if (_strSubTypeName.equalsIgnoreCase("TD-SCDMA") || _strSubTypeName.equalsIgnoreCase("WCDMA") || _strSubTypeName.equalsIgnoreCase("CDMA2000")) {                            strNetworkType = "3G";                        } else {                            strNetworkType = _strSubTypeName;                        }                        break;                }            }        }        return strNetworkType;    }
如有不正确的地方，跪求指正。
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