获取网络连接的实例

int type = 0;
ConnectivityManager connectivitymanager = (ConnectivityManager) context
.getSystemService(context.CONNECTIVITY_SERVICE);
NetworkInfo netinfo = connectivitymanager.getActiveNetworkInfo();

if (netinfo == null) {
return type;
}
if (netinfo.getType() == ConnectivityManager.TYPE_MOBILE) {
type = 1;
}
if (netinfo.getType() == ConnectivityManager.TYPE_WIFI) {
type = 2;
}