Android :: Retrying Http Connection
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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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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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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Oct 5, 2010
I love Handcent but this inability to resend automatically is killing me. I don't have good signal at home (basement flat), so I often send a message and then just wait for the signal to drift in, so it sends. My old blackberry or Nokia had no problems with this. Handcent doesn't handle it well. it either gets stuck with the little whirling whindmill thing and never sends, or it comes up with the red X and the process stalls. I actually prefer the red X, as at least that enables a quick "retry". but it seems to be totally random whether it gets stuck or fails to send. Why oh why is such a simple feature not bug-free in an app like Handcent that is so popular and has been around for some time now?
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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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Feb 12, 2010
I get a poor signal at home (did on my Nokia), so half the time when I send a text, there won't be a signal to send it. I always then go and put my phone in a place where there is a signal and leave it..
With my Nokias, the phone would send it fairly quickly (usually within 10-15 minutes).
The message is still sat in Handcent with the whirling round icon next to it. If I copy the message, and resend it, whilst there's a signal, away it goes. I can't find any way to force the send when I want, and I left the resend in a signal area for 1hr 15 mins and it still hadn't sent..
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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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May 26, 2010
By default HttpClient use HTTP/1.1 protocol, is there any way to change it to HTTP/1.0?
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Aug 11, 2010
I have a paid app on Android Market. I've set up an HTTPS notification URL in Google Checkout settings. Yet notifications don't come. Please, what am I doing wrong? Are realtime order notifications supported for Android Market at all? If so, is there a separate UI for setting those up?
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Apr 6, 2010
I have a problem. I'm doing a http post request to a URL like this; DefaultHttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(url); HttpResponse response = httpclient.execute(httppost); I am able to get the response content (html in this case) but I would like to be able to get the url of the response. Is there a way? Or could i use some other technique to do the post request and retrieve the url? The repsonse url is lke www.url.com?x=1&y=2 and would like to get the parameter values, I've tried to use the getParams().getParameter() on the HttpResponse object without any success. So if anyone has a solution to get the parameters without getting the url.
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Mar 3, 2010
I want to ping a url and post a xml to it using http delete as i want to initiate a delete action on the server side.
But i am not able to post the xml using http delete.
CODE:........................
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Mar 25, 2009
I need to make a GET request to the http://www.x.com/server.xml which takes 3 mandatory headers
hdr1,hdr2,hdr3
I am trying this code:....................
responseCode is 400 which seems a header missing error
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Jul 21, 2009
Given a Url for an image, I wanted to downoload it and paste it onto my canvas in android. How do I retrieve the image to my app ?
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Dec 28, 2009
I am checking out the class org.apache.http.auth. Any more reference or example if anyone has?
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Mar 8, 2010
At the moment I'm trying to build some integration tests for an android project. I would like to use the same apache http classes I use on the android. Which version is this and can I get a jar of that somewhere?
Trying to use the jar that comes with android only resolves in Exceptions... But most of the tests won't need running them in the emulator all the time just because I use some apache libraries or do they?
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