android 网络实时监听网络状态变化 及 网络类型判断

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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