Develop Reference

Android: Proxy (Relay) Server Requests

I have a server and an android app. My server want to request a destination but with the IP of the android device that my app is running on. So I need to proxy the requests (relay them) in my app so the destination could see the client's IP but the server. You can see my explanation in the picture:
How can I do this in my app?

Yes this could be done but not just with relays; you also need to port forwarding mechanism in between. Here is how I would try to do this:
Local portforward the requests of the server onto a dedicated port on your android device and then from their call the Destination server via your relay mechanism which could be fulfilled very succicntly by LittleProxy like solution.

ISP name in Android

I am new to android and currently developing an android application, and I got to a point where I need to find the ISP name when the phone is connected to a wifi access point, there is no function in Android to do it (like the one to get the operator name, already implemented in Android).
Can anyone help me? Share his function or give me a solution on how to do it?
Thanks :)

PeeHaa is right there is no direct method of getting the isp..
Case A is you are directly on mobile network
Case b is you are on wifi
Case c is you are on ththering
In all cases you can use the util lib to get the IP
Utils.getIPAddress(true);
The submit it to a php script like this
<?php
$ip=$_SERVER['REMOTE_ADDR'];
$url=file_get_contents("http://whatismyipaddress.com/ip/$ip");
preg_match_all('/<th>(.*?)<\/th><td>(.*?)<\/td>/s',$url,$output,PREG_SET_ORDER);
$isp=$output[1][2];
$city=$output[9][2];
$state=$output[8][2];
$zipcode=$output[12][2];
$country=$output[7][2];
?>
YOu may use any isp db provide api you want this is just an example..The process will be to get the ip and then submit it to the php script via http and return all the above values..A long process but effective..It will however lag if you have too many request, depends on the api server...happy coding...

Android getting http request from clients

I creating an application that can teather the wifi and act as like a firewall to manage the sessions to their clients .
for example:
If i manage the clients http requests and response..after i authenticated the request ,then only the url has to be visible for them.otherwise it has to say page blocked.
In an Example provided by the google https://developers.google.com/analytics/devguides/collection/android/v2/sessions
It says it can manage sessions But I cant able to integrate it my project .Can anyone worked projects similar to this or anyone used analystics-api, help me to work on this
And how can i get the request page url from the user..

Try this example in your activity ..From this code you able manage your http requests and responses..session-handling-Exampe
Hope will help you..

detect mobile phone by web server

I would like to know what field within the http packet which was sent by client browser to WEB server can i look to detect whether the request was made from mobile device or from a PC.
My web server is open source which uses C programming language and runs a TCP socket and listens on HTTP port.
Can anyone please let me know.

You need to see for HTTP header called "User-Agent". The value of this will help you determine where the request was made from.
For further details you can check this answer: Auto detect mobile browser (via user-agent?)

How to debug http calls on Android devices?

I'm writing a Lovefilm client for Android, and it's not going too badly except I keep having problems with the remote calls to retrieve data from the API.
Does anyone have any tips for debugging remote calls like this? Can I tcpdump on Android or is there a native way of doing it?
For example, I'm using the Scribe-java library for OAuth to access the Lovefilm API, I can authenticate find and retrieve a list of films on the users account fine when the device is running Gingerbread, but trying to retrieve the accessToken on Froyo causes a blank response & and apparent response code of -1, I'd like to be able to see what's going on under the cvers their.
Another example I'd like to be able to the raw http for is trying to run a search, I get and IOError that says "Received authentication challenge is null"

I've used Fiddler (http-proxy for debugging http calls) with the android emulator in these cases. Just start the proxy, and start the emulator with the correct proxy address (-http-proxy ).

Fiddler is the most useful option. On the emulator #Scythe answer will work, but on a real device you will need to set the proxy in the Apache Http Client. The following code will do that:
HttpHost proxy = new HttpHost("youripaddr", 8888);
params.setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
If you are using https, fiddler is not so useful. In that case can enable the build in logging support in Apache Http Client. The following code does that:
Headers only:
java.util.logging.Logger apacheHeaderLog = java.util.logging.Logger.getLogger("org.apache.http.headers");
apacheHeaderLog.setLevel(java.util.logging.Level.FINEST);
Headers & Wire:
java.util.logging.Logger apacheWireLog = java.util.logging.Logger.getLogger("org.apache.http.wire");
apacheWireLog.setLevel(java.util.logging.Level.FINEST);
Note that this will have to have a java.util.logging Handler configured at finest level and the default handler is configured to log to logcat, which will filter DEBUG (finest) entries by default.

If your system can share the wi-fi connection you should be able to route packets from any device through your system and then using wireshark you can get monitor your calls or get a tcpdump.
Also , and more importantly , it would be best if you log your network calls and responses as suggested by #Matthew
Windows 7 wi-fi connection sharing : http://www.winsupersite.com/article/faqtip/windows-7-tip-of-the-week-use-wireless-hosted-networking-to-share-an-internet-connection-wirelessly.aspx

Since I always run into similar troubles and it seems a lot of people having the same issues over and over again I wrote up a quick tutorial for debugging client-server communication by using netcat and cURL.
That of course only works for the simplified case that you always 'fake' on side of the connection.
For eavesdropping you can use tools like tcpdump or Wireshark. Which will definitely be easier if you're able to run the server instance directly on your local machine.

Stetho is a great tool from FB which helps in debugging android Apps. You can have access to local data and have a check on your network using this.
http://facebook.github.io/stetho/