判断是否有网络可用及获取联网方式
1. ConnectivityManager cManager = (ConnectivityManager) getSystemService(this.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = cManager.getActiveNetworkInfo();


int type = networkInfo.getType();

switch(type){
case ConnectivityManager.TYPE_MOBILE: // 手机接入方式
networkType = "MOBILE";
break;
case ConnectivityManager.TYPE_WIFI: // Wifi接入方式
networkType = "WIFI";
break;
}

boolean available = false;
NetworkInfo[] infos = connec.getAllNetworkInfo();
if(infos != null) {
for(NetworkInfo info : infos) {
if(info.isAvailable()){
available = true;
break;
}
}
}
return available;