Http Connection

[Bilal A.Siddiqui]

Hi all

I am trying to access a servlet from my android application. my code looks like this

  public class HelloWeb extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        HttpClient client = new HttpClient();

        GetMethod get = new GetMethod("http://localhost:8080/getAndroid");

        try {
                        int status = client.executeMethod(get);
                        
                }
                catch (Exception e) {
                        Log.e("Error:",e.getMessage());
                }
                finally {
                        get.releaseConnection();
                        get=null;
                }

    }

}  

I am getting an error "connection refused"

[Monu Tripathi]

Take a look at Issue 133: localhost not allowed

[Nehel Patel]

Hi,

I think you need to add the following line to your AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />

and one more thing, replace 'localhost' in your URL with your machine IP.

try it...

[Bilal A.Siddiqui]

hi

i have tested the code with 10.0.2.2 in place of localhost and then with my machine ip which is (172.18.24.188)

but in both cases i am getting an error localhost/127.0.0.1:8080- Connection refused

[Bilal A.Siddiqui]

internet permission is already there in my manifest file.

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

[Ulf Dittmer]

Note that 10.0.2.2 is the "magic" IP address you'd use if running the app in the emulator. If you run it on the actual device (maybe over a WLAN) then you need to use the IP address assigned by the router to the desktop machine, which is propably something like 10.0.1.2.

[Bilal A.Siddiqui]

I am running this app in an emulator. my application is just sending "get" request to a servlet which is mapped in web.xml

but i am getting connection refused.

[Tim Holloway]

Bilal A.Siddiqui wrote:I am running this app in an emulator. my application is just sending "get" request to a servlet which is mapped in web.xml

but i am getting connection refused.

And you will, until the message stops returning the localhost IP address 127.0.0.1. Something's still wrong with your URL.

[Bilal A.Siddiqui]

i have a doubt now whether this android activity knows about my servlet or not. I mean does it know to lookup for that in web.xml. i just felt so because whether tomcat server is ON or OFF the error is same.

localhost/127.0.0.1:8080- Connection refused

[Monu Tripathi]

I understand, you tried http://10.0.2.2:8080/getAndroid on the emulator with Tomcat Running and it did not work, correct? Have you tried what Ulf suggested? [Try IP address of your desktop machine]

[Bilal A.Siddiqui]

hi monu

i tried with my system ip also but the result was same. now i am confused because whether my tomcat server is running or not its giving same error. am i making any mistake in project structure??

[Ulf Dittmer]

i just felt so because whether tomcat server is ON or OFF the error is same.

Can you make ANY network connections, for example using the browser? Does the machine have a firewall that's blocking incoming connections?

[Bilal A.Siddiqui]

hey i have run it on other system in two modes

1. with tomcat server OFF--> nothing happens

2. with tomcat server running--> i get 404 status

what should i do now ???

[Monu Tripathi]

with tomcat server OFF--> nothing happens

depending on what is the default Time Out interval set for HttpClient, your code may either block indefinitely or will get an TimeOutException.

with tomcat server running--> i get 404 status

This is classic Resource not found; are you sure your service is deployed on the server? Can you try it out from your browser?

Additionally:
1. Check if you can access other sites from your emulator.
2. Change the URL in your code to some thing more common like http://www.google.com and see if you get a valid response code.

---
If you are interested you can read up on Android Emulators Network Address Space mapping here.

[Tim Holloway]

Just to clarify on Monu: a 404 error comes from Tomcat. So you're definitely talking to the server now. However you haven't deployed the server application in a way that maps to your URL.

[Bilal A.Siddiqui]

i have done it !!! wow

i called get method of my servlet from my android app, its runninh well.

thanks to all

[Durga Sanju]

Please send the code for connecting android with servlet. Yours is the first and foremost that you have successfully connected, because i have googled almost all the sites but nothing worked.

It will be very very helpful if you send me the code for both client and server.

Thanks in advance.