Get account info from the phone. Requires ACCOUNT Permission in the manifest.

LocationInputScreen.java

      Account[] accounts = AccountManager.get(getView().getContext()).getAccounts();
      Set<String> emailSet = new HashSet<>();
      for (Account account : accounts) {
        if (EMAIL_PATTERN.matcher(account.name).matches()) {
          emailSet.add(account.name);
        }
      }
      getView().txtPlaceName.setAdapter(new ArrayAdapter<>(getView().getContext(),
          android.R.layout.simple_dropdown_item_1line, new ArrayList<>(emailSet)));