android - AccountManager.blockingGetAuthToken() 不提示输入凭据

Question

我在我的应用程序中使用 SyncAdapter 和 AccountAuthenticator。在执行同步操作时，我调用 AccountManager.blockingGetAuthToken 来获取访问 token 。我是这样理解这个方法的，当它无法获得 token 时(或者换句话说，当 getAuthToken 方法返回一个 Intent 以启动 Activity 时)，它会启动我的登录 Activity 。但它只是返回 null，而没有启动 Activity。

这是我的身份验证器的 getAuthToken 方法。

@Override
    public Bundle getAuthToken(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException {

        // Extract the username and password from the Account Manager, and ask
        // the server for an appropriate AuthToken.
        final AccountManager am = AccountManager.get(mContext);

        String authToken = am.peekAuthToken(account, authTokenType);

        // Lets give another try to authenticate the user
        if (TextUtils.isEmpty(authToken)) {
            final String password = am.getPassword(account);
            if (password != null) {
                try {
                    authToken = APIHelper.getInstance().logIn(account.name, password);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        // If we get an authToken - we return it
        if (!TextUtils.isEmpty(authToken)) {
                    // cache
            am.setAuthToken(account, authTokenType, authToken);
            final Bundle result = new Bundle();
            result.putString(AccountManager.KEY_ACCOUNT_NAME, account.name);
            result.putString(AccountManager.KEY_ACCOUNT_TYPE, account.type);
            result.putString(AccountManager.KEY_AUTHTOKEN, authToken);
            return result;
        }

        // If we get here, then we couldn't access the user's password - so we
        // need to re-prompt them for their credentials. We do that by creating
        // an intent to display our AuthenticatorActivity.
        final Intent intent = new Intent(mContext, AuthActivity.class);
        intent.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE, response);
        intent.putExtra(AuthActivity.ARG_ACCOUNT_TYPE, account.type);
        intent.putExtra(AuthActivity.ARG_AUTH_TYPE, authTokenType);
        final Bundle bundle = new Bundle();
        bundle.putParcelable(AccountManager.KEY_INTENT, intent);
        return bundle;
    }

顺便说一句，大部分代码来自 this blog.

Answer 1

看来提问者想通了。对于后代，如果您改用它，它会起作用:

AccountManagerFuture<Bundle> resultFuture = accountManager.getAuthToken(
        account,
        AUTH_TOKEN_TYPE,
        null,
        activity,
        null,
        null
);
Bundle bundle = resultFuture.getResult();
return bundle.getString(AccountManager.KEY_AUTHTOKEN);

我猜 blockingGetAuthToken() 无法自动执行此操作，因为它缺少 activity 参数。而且文档不正确。