Android :: How Http URL Connection Work?
Jan 18, 2010
I need to send asynchronous calls to the server. During network connection this works fine. How ever if i disable my LAN from Network connections android will through a socket exception after the specified timeout for that particular call. Now the issue that i face is the time out happens in a synchronous manner. Though both the calls has been started in a thread the timeout is not happening at the same time. If i keep the timeout as 20sec i am getting a socket exception for the first call after 20 sec and after the next 20 sec i get the timeout for the next call. Why is this happening..? I am not opening two connections asynchronously in this case. I am attaching a sample code that can replicate the above scenario. Code...
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Oct 14, 2010
I'm making an http request. I'm on a platform (android) where network operations often fail because the network connection might not be immediately available. Therefore I'd like to try the same connection N times before completely failing. Was thinking of something like this:
DefaultHttpClient mHttp = ...;
public HttpResponse runHttpRequest(HttpRequestBase httpRequest)
throws IOException
IOException last = null;
for (int attempt = 0; attempt < 3; attempt++) {
try {
HttpResponse response = mHttpClient.execute(httpRequest);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == 200) {
return response }
} catch (IOException e) {
httpRequest.abort();
last = e;
throw last;
I'm mostly worried about the connection being in some state which is invalid on subsequent retries. In other words, do I need to completely recreate 'httpRequest', should I avoid calling httpRequest.abort() in the catch block, and only call it in the final failure?
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Aug 17, 2010
I am using org.apache.http.*; API's to make HTTP Post Connections over Internet from the Android Application. I added the Internet Permissions in the Manifest file and it works fine. Now i want my application to make the same HTTP requests over WiFi network through which the handset is connected.
Do i need to make code changes to achieve this? Do i need to add some permissions? as i am unable to make requests...
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Mar 10, 2010
is there a way to force a connection (http) to go over OTA (Over-The- Air) even if you have a wifi connection?
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Jul 5, 2010
I am a newbie in android and i had a question whether i should use a service or thread for http connection and what will be the advantage of using a service over a thread or viceversa. Please help me out with this.
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Dec 22, 2009
Do you know how to set Content-Type on HttpURLConnection? Following code is on Blackberry and I want the Android equivalent:
connection.setRequestProperty("content-type", "text/plain; charset=utf-8");
connection.setRequestProperty("Host", "192.168.1.36");
connection.setRequestProperty("Expect", "100-continue").
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Sep 29, 2010
I need to make HTTP request on Android using GSM connection, not Wifi. My current solution is to disconnect from all wi-fi connections and perform a request. Is there any better solution? I could not find any relevant methods in the API (I looked in package org.apache.http, but it seems it is completely unaware of what type of connection should be used).
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Apr 26, 2009
I have set up proxy in the sdk emulaotor and can access internet via the proxy in the browser. but this does not work for my http connection application, it gives "Unknown host exception" i have used -dns-server option when launch the app.
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Sep 6, 2010
I'm facing an annoying problem here. My application is connected to a server that sends some data from time to time. It's some kind of eventing server. In order to receive data, I'm connecting to the server with an HttpURLConnection, retrieve the response InputStream and loop on it with the read method. The connection is always open. The distant server is cutting the connection every 5 minutes (for test purpose). When connection is closed, my application has to reconnect again. We detect a Connection Reset by Peer exception when the server closes the connection. The problem is that most of the time, I never receive the Connection Reset by Peer exception. So my application can't know that is has to reconnect and it's stucked on the read instruction. The InputStream.Read() method shouldn't always raise an exception if the connection is closed? What can I do to always detect Connection Reset by Peer exception?
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Dec 21, 2009
I am facing with problem related Http Connection.
MY code...
This code can't download data completely.
For example :
Total size to read : 13901 bytes
Above code can read size : 12937 bytes
What is wrong here?
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Aug 26, 2010
How to create an Http Connection to retrieve a web page content to my android? Please post example code for this.
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Aug 4, 2009
I want to Download image from Server using Http Connection and at same time i want to show ProgressDialod till is not Downloaded i dont undestand.
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Feb 5, 2010
I am trying to create HTTP connection using AsyncTask class.
Is it possible to create HTTP connection ?
Can you suggest sample source code?
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Jul 17, 2009
How to create an HTTP request object of POST type in android? Which class need to be extend or what method need to implement? How to establish connection to a server? Actually i want to connect to a microsoft exchange server, and then i have to send a request to it using HTTP.
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May 1, 2010
Linksys 802.11n 2.4Ghz Droid Incredible I've gone through everything possible and can think of nothing else to do. Any ideas that have worked?
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Aug 15, 2010
How does one get the USB connection to work between my Galaxy and the applications on my PC. For example, I have tried numerous times to connect my Galaxy to my Picasa program on my PC but it never seems to work. I have followed the instructions carefully but it doesn't seem to work....
Any ideas?
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Sep 25, 2010
I recently bought a Telstra HTC Wildfire and unlocked it by code to use my 3 SIM card on it. However, after unlocking my mobile, when I choose the option "use phone for data connection when wi-fi is unavailable" it doesn't work. When i go to mobile network and network operators, I select to search for networks and the phone is automatically connected to "3Telstra(3G)". They also show 3(3G) and 3 networks, but when I try to select any of them, it says that the SIM card does not allow the connection to this network. I don't know if one thing is connected to the other, but I always used my old phone for data connection with the same SIM card.
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Oct 27, 2010
Can xperia x8 gps work with out any network connection or internet connection? Can we use GPS where there is no network coverage or with out a sim card?
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Apr 1, 2010
for whatever reason today we lost our internet connection at work. Now I work for an airline doing charters and today we added a second flight to each shift. So I tethered my phone for the 3g and just plugged it in at the end of the day to charge it. Needless to say it handeled 300 passengers/customers easy. Changes, bag fees, checking in and selling for a solid 8hrs today! I don't think I'll ever get another cell phone ever. Maybe a bigger SD, but phone, probably not.
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Jul 15, 2012
I am using ICS Evervolv a5 on my N1. The mobile data connection works only if I don't connect to a WiFi network. If I do, the only way I have found to make it work again is to reboot the phone.
This means that while I am at home, everything works through WiFi, however, if I leave home, I have to reboot my phone once I am sure the phone is far enough from my WiFi access point to be able to connect. Then, it starts working with the cellular data plan
The only thing I can relate to this is that I have the "application protection" app installed, protecting the settings menu do with a code so my kids don't mess up with that. However, is still hard to believe that's the culprit.
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Oct 26, 2010
I have recently found that my internet connection only appears to work when I am in contact with WIFI, the o2 service seems to have stopped working. When I have wi fi turned off, as I can't connect when I am not in work anyway I use the usual O2 facilty however in this mode, I cannot download anything. I seem to be receiving my email notification ok. Is there something I may need to change in my settings?
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Mar 17, 2010
This is something I have wondered about Android OS/Hero/Sprint since day one of my purchase, but I have never brought it up here. When mobile network is off and WiFi is enabled, I cannot retrieve my Yahoo Mail. It has never really bothered me, because when mobile network is connected and WiFi is off, my mail app (which is connected to Yahoo - I don't use Gmail) worked perfectly fine. Does anybody else use Yahoo as their email server and has the same issue? Is it just Google sticking it to their customers and to Yahoo by saying "ok, if you wan't to use our (#1 competitor's) email service, then we will make it so it will only work on Mobile Networks.
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Apr 21, 2012
when I turn on google maps or navigation this message appear (this application requires a working data connection)
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Jul 26, 2010
I never had a problem until today and now my evo is having trouble connecting in places it used to work great in. And when it does connect, it (a) either doesn't work at all (browser, speed test, nothing registers an internet connection) or (b) works for a minute, then (a) happens. I have an allegedly "good" 4g signal too. Tried soft reset and battery pulling, hoping that the problem will go away before resorting to a factory reset...
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Oct 14, 2009
I'm using ThreadSafeClientConnManager to manage a pool of client connections, because my application has several threads, which are simultaneously connecting to a webserver.
Abstract sample code:
CODE:..............
Now lets say on of this threads is downloading a large file, but then the user of my application is switching to another activity/screen. Therefor the file is needless and I'd like to abort this download connection.
In ThreadSafeClientConnManager I found this method: public ClientConnectionRequest requestConnection (HttpRoute route, Object state) Returns a new ClientConnectionRequest, from which a ManagedClientConnection can be obtained or the request can be aborted.
So far I've been using:
CODE:.........
Now from what I understand, I've to use:
httpclient.getConnectionManager().requestConnection(HttpRoute route, Object state);
And that's the point where I'm stuck. I assume that for the route I can just use new HttpRoute(new HttpHost("10.0.0.1")) or whatever my server is, but what to put in for Object state?
And second, as soon as I've the ClientConnectionManager I can call getConnection(long timeout, TimeUnit tunit). But then from there, how I do I execute my HttpGet httpRequest = new HttpGet(URL_TO_FILE); as I did before with HttpResponse response = (HttpResponse) httpclient.execute(httpRequest);?
I've been gone through the documentation and tried out quite a few different things, but I wasn't able to obtain a working solution. Therefor any suggestions and/or code examples are more than welcome.
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May 12, 2010
Whenever a application needs internet and connection fails, I get a message dialog
Connection failed
This application requires network access. Enable mobile network or Wi-Fi to download data.
and two buttons, Settings, Cancel.
How do I detect there is no internet connection?
How do I popup a same dialog in my application?
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Oct 27, 2010
I'm coding a very basic FTP client on top of my application and I have 2 activities. The first one is the file explorer and the second one is the image viewer. Once I click on the image filename on the explorer, I want to pass the connection to the other activity to handle extra stuff. Basically, I want to keep the same org.apache.commons.net.ftp.FTPClient object (which handles the connection) alive in-between the 2 activities. I know I can't pass an object inside an intent so I don't know what my best bets are.
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Jul 23, 2010
What's the technical term for being able to have voice connection and data connection simultaneously? Like AT&T was promoting heavily for a while.Apparently, the new T-Mobile Vibrant has this capability. A friend got one and was accessing the web while talking to me, double jealous now.I have benn lusting after the Verizon version, Fascinate, and wondering if there is any chance it will as well.
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Sep 7, 2009
If my screen locks while I have a wifi connection, then the connection is lost when I unlock the phone.First, is this perhaps deliberate, to save power? Also, either way, when I unlock the screen and go into wifi settings, I see that the phone is trying to make a wifi connection, but it never succeeds, even though it's my home network and I'm in the same room as the router. It just states 'Obtaining address.
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Sep 15, 2010
Long time reader, first time poster here. How does one know if the Epic is using the wifi connection as opposed to using the 3G connection? When wifi is connected both that and the 3G connection shows at the top. So which one is in control per se? And how can it be verified?
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