First of all, Android phone is connected both 3G network and wifi.
At this time I'd like to send http request through 3G network without using wifi.
How can I do it?
I don't think you can do this because in Android only one Network is active at any point of time. So for that first you need to check which network is active and then if it is a Wi-Fi one, then disconnect it, then Android will fallback to other one which will be 3G (if there is no other wi-fi network available), then you can send your request which will go through 3G network.outline might look like this:ConnectivityManager cm = (ConnectivityManager)Context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni = cm.getActiveNetworkInfo();
if(ni == null)
//no connectivity, abort
if(ni.getType() == ConnectivityManager.TYPE_WIFI || ni.getType() == ConnectivityManager.TYPE_WIMAX) {
WifiManager wm = (WifiManager)Context.getSystemService(Context.WIFI_SERVICE);
if( wm != null)
wm.disconnect();
//this will force android to fallback to other available n/w which is 3G
}
while(true) {
NetworkInfo ni = cm.getActiveNetworkInfo();
if( ni != null && ni.getType() == ConnectivityManager.TYPE_MOBILE && ni.isConnected()) {
//send your http request
break;
}
//sleep for some time, so that android can connect you to other n/w
}
You might need to loop through all active n/w and disconnect them till you find 3G network. I am assuming that there is just one Wi-Fi network and one 3G network available.
Related
Both wifi and data connection are enabled.
Since I need to use mobile data to send a http request to mobile carrier to get phone number, But android will use wifi as prior, so How can I use data connection instead of WIFI?
When I enable the wifi and mobile data int the device. I use getAllNetworks() method, but it always returns wifi. I don't know Why getAllNetworks just return wifi when I enable both wifi and mobile data?
When I just enable the mobile data, the getAllNetworks() return mobile data info.
ConnectivityManager connectivityManager = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);
Network[] network = connectivityManager.getAllNetworks();
if(network != null && network.length >0 ){
for(int i = 0 ; i < network.length ; i++){
NetworkInfo networkInfo = connectivityManager.getNetworkInfo(network[i]);
int networkType = networkInfo.getType();
if(ConnectivityManager.TYPE_MOBILE == networkType ){
connectivityManager.bindProcessToNetwork(network[i]);
}
}
}
Does some one know how to use data connection instead of WIFI when both wifi and data connection are enabled?
You can use data connection instead of WIFI only if you are working on Android Lollipop.
And it seems you are trying to use Android Lollipop with target API 23 because you used bindProcessToNetwork instead of setProcessDefaultNetwork.
Android Lollipop allows the multi-network connection.
ConnectivityManager cm;
cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkRequest.Builder req = new NetworkRequest.Builder();
req.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET);
req.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR);
cm.requestNetwork(req.build(), new ConnectivityManager.NetworkCallback() {
#Override
public void onAvailable(Network network) {
//here you can use bindProcessToNetwork
}
});
I have a code to determine if there is a network connection or not :
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnected())
{
// There is an internet connection
}
But if there is a network connection and no internet this is useless. I have to ping a website and wait for a response or timeout to determine the internet connection:
URL sourceUrl;
try {
sourceUrl = new URL("http://www.google.com");
URLConnection Connection = sourceUrl.openConnection();
Connection.setConnectTimeout(500);
Connection.connect();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
// no Internet
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
// no Internet
}
But it is a slow detection. I should learn a good and fast way to detect it.
Thanks in advance.
Try following method to detect different type of connection:
private boolean haveNetworkConnection(Context context)
{
boolean haveConnectedWifi = false;
boolean haveConnectedMobile = false;
ConnectivityManager cm = (ConnectivityManager) Your_Activity_Name.this.getSystemService(Context.CONNECTIVITY_SERVICE);
// or if function is out side of your Activity then you need context of your Activity
// and code will be as following
// (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo[] netInfo = cm.getAllNetworkInfo();
for (NetworkInfo ni : netInfo)
{
if (ni.getTypeName().equalsIgnoreCase("WIFI"))
{
if (ni.isConnected())
{
haveConnectedWifi = true;
System.out.println("WIFI CONNECTION AVAILABLE");
} else
{
System.out.println("WIFI CONNECTION NOT AVAILABLE");
}
}
if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
{
if (ni.isConnected())
{
haveConnectedMobile = true;
System.out.println("MOBILE INTERNET CONNECTION AVAILABLE");
} else
{
System.out.println("MOBILE INTERNET CONNECTION NOT AVAILABLE");
}
}
}
return haveConnectedWifi || haveConnectedMobile;
}
The problem with all such schemes is that 'the internet' does not exist as an entity. There is a reason why failed connection attempts are reported as 'unreachable' or 'cannot connect to server at blahblah'. Examples:
1) You have no signal. Are you connected to the internet? Will PING succeed? Can you connect to your target server?
2) You have a signal, but your provider data allowance has been exceeded. Are you connected to the internet? Will PING succeed? Can you connect to your target server?
3) Your provider connection is fine, but their backbone router is down. Are you connected to the internet? Will PING succeed? Can you connect to your target server?
4) Your provider connection is fine, their backbone router is up but the fibre connection to country X where the server is has been interrupted by some drunken Captain and his ship's anchor. Are you connected to the internet? Will PING succeed? Can you connect to your target server?
5) All the links to the target country are up but Fred, with his ditch-digging JCB, has cut the power cable to the server farm. One of Fred's other jobs is to service the backup generator:( Are you connected to the internet? Will PING succeed? Can you connect to your target server?
6) All the hardware is up, but the server code was written by Fred before he was demoted to ditch-digger for incompetence and has now crashed, again. Are you connected to the internet? Will PING succeed? Can you connect to your target server?
7) Fred has had a day off, but his replacement, competent server admin has blocked off ICMP ping in the routers to prevent ping DOS attacks. Are you connected to the internet? Will PING succeed? Can you connect to your target server?
So, the ony way to be sure is to attempt to connect to the target server and see what happens.
You can surely detect some negative cases more quickly - surely if there is no signal, you cannot get a connection:) Past that, you should just try to connect. Tell the user what is going on, use a timeout and supply the user with a 'Cancel' button. That's about the best you can do.
How about this?
Make sure you have an active WiFi connection, now Use WifiManager.getConnectionInfo() which returns dynamic information about the current Wi-Fi connection, WifiInfo , you can get WifiInfo.getLinkSpeed(), which gives you the current link speed and check that against some minimum value.
I have an Android application which connects to the Internet. I am trapping all the possible scenarios for the connection and notice that when I don't have an Internet connection, an UnknownHostException is thrown. I am a bit confused here since getting an UnknownHostException will mean that the application was able to connect to the Internet but wasn't able to find the given URL.
Am I getting the right Exception? Could you explain why am I getting an UnknownHostException in this?
Also, can you tell the specific Exceptions for these scenarios:
When there is no Internet connection.
When the URL cannot be found.
When the request timed out.
When the website is down.
When access is denied.
I would also appreciate it if you could give me more scenarios and Exceptions. I have to trap all the possible connections and display the most appropriate message depending on the type of connection Error.
getting an UnknownHostException will mean that the application was
able to connect to the Internet
No it doesn't. It means the application was unable to resolve the host name. That could be because the host name doesn't exist, or because it was unable to connect to the Internet to resolve it.
When there is no Internet connection.
No specific exception. "There is no Internet connection" doesn't have a well-defined meaning. The condition resolves to one of the other failure modes below.
When the URL cannot be found.
If the host cannot be found, UnknownHostException. If the content part of the URL cannot be found, HTTP 404.
When the request timed out.
ConnectException with 'connection timed out' as the message, or SocketTimeoutException if it's a read timeout.
When the website is down.
ConnectException with 'connection refused' as the message.
When access is denied.
HTTP 403.
Checking Internet Connection,Just try this sample function....
public static boolean CheckInternet(Context context)
{
ConnectivityManager connec = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
android.net.NetworkInfo wifi = connec.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
android.net.NetworkInfo mobile = connec.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
return wifi.isConnected() || mobile.isConnected();
}
I hope this help....
for checking internet connectivity ....
boolean b_IsConnect = isNetworkAvailable();
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager
.getActiveNetworkInfo();
return activeNetworkInfo != null;
}
To check internet connection, use this function .
public boolean isConnectingToInternet(){
ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null)
{
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null)
for (int i = 0; i < info.length; i++)
if (info[i].getState() == NetworkInfo.State.CONNECTED)
{
return true;
}
}
return false;
}
I would like to know if the mobile network is enabled or disabled.
My application is designed to help the user when he receives a phone call, and to do this I need Internet access. Thus, I would like to display an information box when the user access the application for the first time if Wi-Fi has a sleep policy and Mobile network is disabled. (I need Internet within milliseconds after the phone start ringing).
I found Settings.System.WIFI_SLEEP_POLICY, but I can't find any information on how to check if mobile network is disabled (when Wi-Fi is on and working).
Any help would be appreciated!
Edit:
The problem is that I want to know if mobile network is turned of by the user (while the phone could have WiFi access at the time).
I finally found a solution. Apparently not all phones have this option:
Home > Menu > Settings > Wireless & networks > Mobile network (checkbox)
However, for those who do, this method will work:
/**
* #return null if unconfirmed
*/
public Boolean isMobileDataEnabled(){
Object connectivityService = getSystemService(CONNECTIVITY_SERVICE);
ConnectivityManager cm = (ConnectivityManager) connectivityService;
try {
Class<?> c = Class.forName(cm.getClass().getName());
Method m = c.getDeclaredMethod("getMobileDataEnabled");
m.setAccessible(true);
return (Boolean)m.invoke(cm);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
apparently there is an alternative, more clean solution then the Reflection approach:
final ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo networkInfo = cm.getActiveNetworkInfo();
int type = networkInfo.getType();
String typeName = networkInfo.getTypeName();
boolean connected = networkInfo.isConnected()
networkInfo.getType() will return '0' when connected to mobile network
or '1' when connected trough WIFI. networkInfo.getTypeName() will return
the strings "mobile" or "WIFI". and networkInfo.isConnected() will tell you whether or not you have an active connection.
UPDATE FOR ANDROID 5.0+ (API 21+)
Calling getMobileDataEnabled via the reflection leads to NoSuchMethodException on Android 5.0+ on some devices. So in addition to accepted answer you may wanna do second check if NoSuchMethodException is thrown.
...
catch(NoSuchMethodException e)
{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
{
isDataEnabled = Settings.Global.getInt(context.getContentResolver(), "mobile_data", 0) == 1;
}
}
you can use below code this is working for all API versions:
ConnectivityManager cm =
(ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isConnected = activeNetwork != null &&
activeNetwork.isConnectedOrConnecting();
if(isConnected)
{
if(activeNetwork.getType()==ConnectivityManager.TYPE_MOBILE)
return true;
else
return false;
}
else
return false;
PackageManager pm = context.getPackageManager();
boolean hasTelephony = pm.hasSystemFeature(PackageManager.FEATURE_TELEPHONY);
i want know the current internet connection on device??
in android i found the two property to know network type like..
ConnectivityManager.TYPE_WIFI
ConnectivityManager.TYPE_MOBILE
but how to know 3G network??
pls help me out
Thanks in Advance!
now i can know 3 type of network as follow..........
ConnectivityManager connec = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);
android.net.NetworkInfo wifi = connec.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
android.net.NetworkInfo mobile = connec.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
NetworkInfo info = connec.getActiveNetworkInfo();
int netSubType = info.getSubtype();e
if (wifi.isConnected())
{
wifi is connected
}
else if (mobile.isConnected())
{
if(netSubType == TelephonyManager.NETWORK_TYPE_UMTS)
{
3G is connected
}
else
{
GPRS is connected
}
}
try to get subType() with this snippet:
NetworkInfo info = mConnectivity.getActiveNetworkInfo();
int netSubType = info.getSubtype();
then if netSubType is TelephonyManager.NETWORK_TYPE_UMTS, then its a 3G network
Updated: What's 'info' here
As far as I have used 3G is coming under ConnectivityManager.TYPE_MOBILE only.
If you are using emulator then you can press F8 to connect and disconnect 3G.
It also disconnects GPRS. for both ConnectivityManager.TYPE_MOBILE is used.