package com.android.util;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.telephony.TelephonyManager;

public class NetworkUtil {
    private NetworkUtil() {
        throw new UnsupportedOperationException("u can't instantiate me...");
    }

    private static NetworkInfo getActiveNetworkInfo(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        return cm.getActiveNetworkInfo();
    }

    /**
     * 获取当前网络类型
     * 需添加权限 {@code <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>}
     */
    public static NetworkType getNetworkType(Context context) {
        NetworkType netType = NetworkType.NETWORK_NO;
        NetworkInfo info = getActiveNetworkInfo(context);
        if (info != null && info.isAvailable()) {

            if (info.getType() == ConnectivityManager.TYPE_WIFI) {
                netType = NetworkType.NETWORK_WIFI;
            } else if (info.getType() == ConnectivityManager.TYPE_MOBILE) {
                switch (info.getSubtype()) {
                    case TelephonyManager.NETWORK_TYPE_TD_SCDMA:
                    case TelephonyManager.NETWORK_TYPE_EVDO_A:
                    case TelephonyManager.NETWORK_TYPE_UMTS:
                    case TelephonyManager.NETWORK_TYPE_EVDO_0:
                    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:
                        netType = NetworkType.NETWORK_3G;
                        break;

                    case TelephonyManager.NETWORK_TYPE_LTE:
                    case TelephonyManager.NETWORK_TYPE_IWLAN:
                        netType = NetworkType.NETWORK_4G;
                        break;

                    case TelephonyManager.NETWORK_TYPE_GSM:
                    case TelephonyManager.NETWORK_TYPE_GPRS:
                    case TelephonyManager.NETWORK_TYPE_CDMA:
                    case TelephonyManager.NETWORK_TYPE_EDGE:
                    case TelephonyManager.NETWORK_TYPE_1xRTT:
                    case TelephonyManager.NETWORK_TYPE_IDEN:
                        netType = NetworkType.NETWORK_2G;
                        break;
                    default:
                        String subtypeName = info.getSubtypeName();
                        if (subtypeName.equalsIgnoreCase("TD-SCDMA")
                                || subtypeName.equalsIgnoreCase("WCDMA")
                                || subtypeName.equalsIgnoreCase("CDMA2000")) {
                            netType = NetworkType.NETWORK_3G;
                        } else {
                            netType = NetworkType.NETWORK_UNKNOWN;
                        }
                        break;
                }
            } else if(info.getType()==ConnectivityManager.TYPE_ETHERNET){
                netType = NetworkType.NETWORK_ETHERNET;
            } else {
                netType = NetworkType.NETWORK_UNKNOWN;
            }
        }
        return netType;
    }





    public static boolean isActive(Context context) {
        NetworkInfo info = getActiveNetworkInfo(context);
        if (info != null && info.isAvailable() && info.isConnected()) {
            return true;
        }
        return false;
    }












}