Android login in my app with google credentials

Question

HI I\'m developing an application in wich I want to permit the user to login to my server with his Google account without asking him the credentials because I know that are

Answer 1

Is this what you want?

List<String> googleAccounts = new ArrayList<String>();
Account[] accounts = AccountManager.get(this).getAccounts();
for (Account account : accounts) {
  if (account.type.equals("com.google")) {
    googleAccounts.add(account.name);
  }
}

You can see a more detailed example in the code of the ChromeToPhone app open-sourced by Google: http://www.google.com/codesearch/p?hl=en#JWblrwroAxw/trunk/android/src/com/google/android/apps/chrometophone/MainActivity.java&l=311