android获取网络状态变化,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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