This is a simple tip for handling sessions in android applications which communicates with server for retrieving information. Created an instance of DefaultHttpClient in the first Activity when connection established.

public static DefaultHttpClient httpClient;

  Initialize it for the first time as follows.

URL url=new URL(urlToHit);
LoginScreen.httpClient = new DefaultHttpClient(); //LoginScreen is the name of the current Activity

HttpPost httppost = new HttpPost(url.toString());
HttpResponse response = LoginScreen.httpClient.execute(httppost);

  Now for all further connections I used the same httpClient For example in the next activity.

URL url=new URL(urlToHit);
HttpPost httppost = new HttpPost(url.toString());
HttpResponse response = LoginScreen.httpClient.execute(httppost);

This is a simple but useful method for handling http sessions in android.

By this way you can keep your app authenticated in server side