Fetch all the accounts with the account name in Android Device

   
 1.Get an instance of AccountManager using get(activity).

public void GetGmailUsername(Activity activity) {

        AccountManager accmanager = AccountManager.get(activity);
        Account[] accounts = accmanager .getAccountsByType("com.google");
        List<String> Usernamelists = new LinkedList<String>();

        for (Account account : accounts) {
           
            Usernamelists .add(account.name);

        }

        System.out.println("Usernamelists --"+Usernamelists );
             
    }