这段代码来自AuthenticatorActivityAndroid SampleSyncAdapter示例项目。它说，
我们将从服务器返回的 authToken 存储为该帐户的“密码”——因此我们永远不会在本地存储用户的实际密码。
但我根本看不到authToken被使用。为什么？这是一个错误还是故意的？
/**
* Called when response is received from the server for authentication
* request. See onAuthenticationResult(). Sets the
* AccountAuthenticatorResult which is sent back to the caller. We store the
* authToken that's returned from the server as the 'password' for this
* account - so we're never storing the user's actual password locally.
*
* @param result the confirmCredentials result.
*/
private void finishLogin(String authToken) {
Log.i(TAG, "finishLogin()");
final Account account = new Account(mUsername, Constants.ACCOUNT_TYPE);
if (mRequestNewAccount) {
mAccountManager.addAccountExplicitly(account, mPassword, null);
// Set contacts sync for this account.
ContentResolver.setSyncAutomatically(account, ContactsContract.AUTHORITY, true);
} else {
mAccountManager.setPassword(account, mPassword);
}
final Intent intent = new Intent();
intent.putExtra(AccountManager.KEY_ACCOUNT_NAME, mUsername);
intent.putExtra(AccountManager.KEY_ACCOUNT_TYPE, Constants.ACCOUNT_TYPE);
setAccountAuthenticatorResult(intent.getExtras());
setResult(RESULT_OK, intent);
finish();
}