Shared Preference problem in android app

in my app the first activity is a sign in page. In the edit boxes i am typing the user name and password. Those values are been move to an api and in return i am getting the userid from the server as an xml file.

I am parsing the xml file and storing the value in shared preferrence as follows

SharedPreferences.Editor IdEditor = Id.edit();
IdEditor.putString("useridValue", chap.getid());
IdEditor.comm开发者_开发技巧it();

And in the next time when the user opens the app i want to check whether it is already signed i or not. How to check this using the value stored in Shared preference

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is your Id class extending SharedPreferences ?

maybe

String userId = Id.getString("useridValue");

If your preference is stored in the default preference then you can

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);

String userId = prefs.getString("useridValue");

on a side note you shouldn't really use a capital I on the IdEditor variable it should probably be idEditor

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Check whether this entry already exist in shared preference, using:

id.containskey("useridvalue")