android开发——获取网络状态和网络类型（工具类）

代码如下：

public class NetworkUtil {
    public static final String wifi = "wifi";
    public static final String moblie2g = "2G";
    public static final String moblie3g = "3G";
    public static final String moblie4g = "4G";

    /**
     * @return true 表示网络可用
     */
    public static boolean isNetworkAvailable() {
        ConnectivityManager connectivity = (ConnectivityManager)MyApplication.myContext.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (connectivity != null) {
            NetworkInfo info = connectivity.getActiveNetworkInfo();
            if (info != null && info.isConnected()){
                // 当前网络是连接的
                if (info.getState() == NetworkInfo.State.CONNECTED){
                    // 当前所连接的网络可用
                    return true;
                }
            }
        }
        return false;
    }


    /**
     * 判断网络类型 0是wifi 1 是手机 -1 未联网
     * @param context
     * @return
     */
    public static int isWifi(Context context){
        int type = -1;
        ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if(connectivity != null){
            NetworkInfo info = connectivity.getActiveNetworkInfo();
            if (info != null && info.isConnected()){
                if (info.getType() == ConnectivityManager.TYPE_WIFI){
                    type = 0;
                }else if(info.getType() == ConnectivityManager.TYPE_MOBILE){
                    type = 1;
                }
            }
        }
        return type;
    }

    /**
     * 判断当前网络类型
     * @param context
     * @return
     */
    public static String getNetworkType(Context context){
        String strNetworkType = null;
        ConnectivityManager connectivity = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if(connectivity != null){
            NetworkInfo info = connectivity.getActiveNetworkInfo();
            if (info != null && info.isConnected()){
                if (info.getType() == ConnectivityManager.TYPE_WIFI){
                    strNetworkType = wifi;
                }else if(info.getType() == ConnectivityManager.TYPE_MOBILE){
                    String _strSubTypeName = info.getSubtypeName();
                    int networkType = info.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 = moblie2g;
                            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 = moblie3g;
                            break;
                        case TelephonyManager.NETWORK_TYPE_LTE:    //api<11 : replace by 13
                            strNetworkType = moblie4g;
                            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 = moblie3g;
                            }else{
                                strNetworkType = _strSubTypeName;
                            }
                            break;
                    }
                }
            }
        }
        return strNetworkType;

    }
}

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