title: AccountManager account chooser intent
body: <p>I want to authenticate my app's user with his Google account because this is the simplest method to authenticate the user on multiple devices.</p>
  
  <p>My question is, if I use <code>AccountPicker.newChooseAccountIntent</code> intent and the user selects one account and I'll get it's email address as result in <code>onActivityResult</code>, is this already verified by Android in a way, that makes sure that the user has had to input the correct password for the account?</p>
  
  <p>By this I want to ask, if it's possible to get an email address that the user has no rights for. Do I need to do some further checking for the email address to verify, that it belongs to the user?</p>
  
  <p>My app is about the user's text messages, so I don't want to allow hackers to access these by selecting an account that they don't have a password for.</p>