Android获取网络类型

public static final String NETWORK_CLASS_UNKNOWN = "unknown";
public static final String NETWORK_CLASS_WIFI = "wifi";
public static final String NETWORK_CLASS_2_G = "2g";
public static final String NETWORK_CLASS_3_G = "3g";
public static final String NETWORK_CLASS_4_G = "4g";

/**
* 获取网络类型
* @param context
* @return
*/
public static String getNetworkType(Context context) {

ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getActiveNetworkInfo();

if (info != null) {

switch (info.getType()) {
case ConnectivityManager.TYPE_WIFI:
return NETWORK_CLASS_WIFI;
case ConnectivityManager.TYPE_MOBILE:
switch (info.getSubtype()) {
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:
return NETWORK_CLASS_2_G;
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:
case TelephonyManager.NETWORK_TYPE_EHRPD:
case TelephonyManager.NETWORK_TYPE_HSPAP:
return NETWORK_CLASS_3_G;
case TelephonyManager.NETWORK_TYPE_LTE:
return NETWORK_CLASS_4_G;
default:
return NETWORK_CLASS_UNKNOWN;
}
default:
return NETWORK_CLASS_UNKNOWN;
}
}

return NETWORK_CLASS_UNKNOWN;
}