android 中 我们经常需要判断 各种网络类型 然后需要给用户做出相应的提示，一般网络类型有 2g ,3g,4g ,wifi，无网络等等。


1. 网络类型判断

TelephonyManager 中 定义常量值 

public static final int NETWORK_TYPE_1xRTT = 7;public static final int NETWORK_TYPE_CDMA = 4;public static final int NETWORK_TYPE_EDGE = 2;public static final int NETWORK_TYPE_EHRPD = 14;public static final int NETWORK_TYPE_EVDO_0 = 5;public static final int NETWORK_TYPE_EVDO_A = 6;public static final int NETWORK_TYPE_EVDO_B = 12;public static final int NETWORK_TYPE_GPRS = 1;public static final int NETWORK_TYPE_HSDPA = 8;public static final int NETWORK_TYPE_HSPA = 10;public static final int NETWORK_TYPE_HSPAP = 15;public static final int NETWORK_TYPE_HSUPA = 9;public static final int NETWORK_TYPE_IDEN = 11;public static final int NETWORK_TYPE_LTE = 13;public static final int NETWORK_TYPE_UMTS = 3;public static final int NETWORK_TYPE_UNKNOWN = 0;




   public static int getNetworkType(Context context) {        ConnectivityManager connectMgr = (ConnectivityManager) context.getSystemService(                Context.CONNECTIVITY_SERVICE);        NetworkInfo info = connectMgr.getActiveNetworkInfo();        if (info != null) {            if (info.getType() == ConnectivityManager.TYPE_MOBILE) {                switch (info.getSubtype()) {                    case TelephonyManager.NETWORK_TYPE_CDMA:  // telcom                    case TelephonyManager.NETWORK_TYPE_1xRTT: // telecom                    case TelephonyManager.NETWORK_TYPE_GPRS:  // unicom                    case TelephonyManager.NETWORK_TYPE_EDGE:  // cmcc                        return NETWORK_TYPE_2G;                    case TelephonyManager.NETWORK_TYPE_EHRPD:  // telecom                    case TelephonyManager.NETWORK_TYPE_EVDO_0: // telecom                    case TelephonyManager.NETWORK_TYPE_EVDO_A: // telecom 3.5G                    case TelephonyManager.NETWORK_TYPE_EVDO_B: // telecom 3.5G                    case TelephonyManager.NETWORK_TYPE_HSPA:   // unicom                    case TelephonyManager.NETWORK_TYPE_HSPAP:  // unicom                    case TelephonyManager.NETWORK_TYPE_HSDPA:  // unicom 3.5G                    case TelephonyManager.NETWORK_TYPE_HSUPA:  // unicom 3.5G                    case TelephonyManager.NETWORK_TYPE_UMTS:   // unicom                        return NETWORK_TYPE_3G;                    case TelephonyManager.NETWORK_TYPE_LTE:                        return NETWORK_TYPE_4G;                }            } else if (info.getType() == ConnectivityManager.TYPE_WIFI) {                return NETWORK_TYPE_WIFI;            }        }        return NETWORK_TYPE_NONE;    }



    public static final int NETWORK_TYPE_NONE = 0;    public static final int NETWORK_TYPE_2G = 2;    public static final int NETWORK_TYPE_3G = 3;    public static final int NETWORK_TYPE_4G = 4;    public static final int NETWORK_TYPE_WIFI = 10; private String getNetType() {        int type = getNetworkType(mContext);        String netType = "";        switch (type) {            case Utils.NETWORK_TYPE_NONE:                netType = "";                break;            case Utils.NETWORK_TYPE_2G:                netType = "2G";                break;            case Utils.NETWORK_TYPE_3G:                netType = "3G";                break;            case Utils.NETWORK_TYPE_4G:                netType = "4G";                break;            case Utils.NETWORK_TYPE_WIFI:                netType = "wifi";                break;        }        return netType;    }




2.实时监听网络切换


实现监听网络的功能主要依靠 广播监听 。不多说 看代码。回调中逻辑改成自己的就可以了。 
oncreate中 需要注册一下 广播mNetworkReceiver = new NetTypeReceiver();registerReceiver(mNetworkReceiver, intent);ondestory中需要将广播销毁if (mNetworkReceiver != null) {            unregisterReceiver(mNetworkReceiver);            mNetworkReceiver = null;}private class NetTypeReceiver extends BroadcastReceiver {    String type = "";    @Override    public void onReceive(Context context, Intent intent) {        String action = intent.getAction();        if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {            ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(                    Context.CONNECTIVITY_SERVICE);            NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();            if (networkInfo != null && networkInfo.isAvailable()) {                String name = networkInfo.getTypeName();                switch (networkInfo.getType()) {                    case 0://移动 网络                        if (TextUtils.isEmpty(type)) {                                                 type = name;                                        }                        break;                    case 1:wifi网络                        if (TextUtils.isEmpty(type)) {                            type = name;                        }                        break;                }            } else {// 无网络                //network was unavailable, stop the streamer, and show a dialog                showNetworkInvalidView(R.string.network_error_message);                type = "";            }        }    }}


       
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