Android: get user ID without requiring scary (for user) permissions?

Question

In order to manage user preferences, at present I\'m grabbing the google user name (effectively the email address they\'ve registered to the device) and using (a hash of) that a

Answer 1

If you use Google Play Services you can get the account type and account name without any extra permissions.

First, add the following dependency to build.gradle:

compile 'com.google.android.gms:play-services-auth:8.4.0'

Next, launch the account chooser intent:

Intent intent = AccountPicker.newChooseAccountIntent(null, null,
    new String[]{GoogleAuthUtil.GOOGLE_ACCOUNT_TYPE},
    false, null, null, null, null);

try {
  startActivityForResult(intent, REQUEST_CODE_EMAIL);
} catch (ActivityNotFoundException e) {
  // This device may not have Google Play Services installed.
  // TODO: do something else
}

Finally, override onActivityResult to get the account type and account name:

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  if (requestCode == REQUEST_CODE_EMAIL && resultCode == RESULT_OK) {
    String accountName = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
    String accountType = data.getStringExtra(AccountManager.KEY_ACCOUNT_TYPE);
    // TODO: do something with the accountName
    return;
  }
  super.onActivityResult(requestCode, resultCode, data);
}

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source: https://stackoverflow.com/a/19444640/1048340