Android Apps Accessing Google spreadsheets

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Java

Mobile

Android

Google-Docs

hi fellow developers ,

I am developing a android application in which i want my datasource to be Google spread sheets.I am begineer in this .I only know this part for getting google access token.What else do i have to do to access the google gmail spread sheets
i have also created a account manager
Please let me know the further steps.

I google it but i got the code for .net only for OAuth2
I need the OAuth2 for JAVA

import com.google.gdata.client.authn.oauth.*;
import com.google.gdata.util.*;
import com.google.gdata.client.docs.*;
import com.google.gdata.data.spreadsheet.*;
import com.google.api.client.auth.oauth2.*;
import com.google.api.client.auth.oauth2.AuthorizationCodeRequestUrl;
import com.google.api.client.auth.oauth2.TokenRequest;






@SuppressWarnings("unused")
public class oauth
{
    // Google code console info
    String Client_ID = "myid";
    String Client_Secret = "key";
    String scope = "https://spreadsheets.google.com/feeds https://docs.google.com/feeds";
    String Redirec_Url = "url";

    //setting oAuth2
//What to do,,, Please tell if any other library required 
                 AccountManager am = AccountManager.get(this);//this denotes to the activity 
		Bundle options = new Bundle();
   
		Account[] abc = am.getAccountsByType("com.google");

}

elp me out ..i gogle it but found code for .net for OAuth2 ineed the code in JAVA
Thanks in advance
aksh619