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任務
使用Android的認證管理器創建一次性登錄功能。使用android創建認證管理器
我目前使用的抽射從形式閱讀電子郵件和密碼，併發送一個請求到服務器
根據需要更改當前進程
爲了能夠創建一個一次性登錄後使用憑證，使用Android身份驗證管理器繼此之後post
問題
1.我的問題在於執行驗證器類的getAuthToken下的fetchTokenFromCredentials方法。以下是代碼片段：
@Override
public Bundle getAuthToken(AccountAuthenticatorResponse response,
Account account, String authTokenType, Bundle options)
throws NetworkErrorException {
// We can add rejection of a request for a token type we
// don't support here
// Get the instance of the AccountManager that's making the
// request
final AccountManager am = AccountManager.get(mContext);
// See if there is already an authentication token stored
String authToken = am.peekAuthToken(account, authTokenType);
// If we have no token, use the account credentials to fetch
// a new one, effectively another logon
if (TextUtils.isEmpty(authToken)) {
final String password = am.getPassword(account);
if (password != null) {
authToken = fetchTokenFromCredentials(account.name, password, authTokenType)
}
}
// If we either got a cached token, or fetched a new one, hand
// it back to the client that called us.
if (!TextUtils.isEmpty(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 don't have a token, and we don't have
// a password that will let us get a new one (or we weren't able
// to use the password we do have). We need to fetch
// information from the user, we do that by creating an Intent
// to an Activity child class.
final Intent intent = new Intent(mContext, LoginActivity.class);
// We want to give the Activity the information we want it to
// return to the AccountManager. We'll cover that with the
// KEY_ACCOUNT_AUTHENTICATOR_RESPONSE parameter.
intent.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE,
response);
// We'll also give it the parameters we've already looked up, or
// were given.
intent.putExtra(LoginActivity.ARG_IS_ADDING_NEW_ACCOUNT, false);
intent.putExtra(LoginActivity.ARG_ACCOUNT_NAME, account.name);
intent.putExtra(LoginActivity.ARG_ACCOUNT_TYPE, account.type);
intent.putExtra(LoginActivity.ARG_AUTH_TYPE, authTokenType);
// Remember that we have to return a Bundle, not an Intent, but
// we can tell the caller to run our intent to get its
// information with the KEY_INTENT parameter in the returned
// Bundle
final Bundle bundle = new Bundle();
bundle.putParcelable(AccountManager.KEY_INTENT, intent);
return bundle;
}
以前我是用排球，所以我實施fetchTokenfromCredentials是像如下所示。然而，我現在不能使用相同的實現，因爲我需要'返回'一個認證字符串。 Volley異步執行登錄，所以即使我向下面的函數添加返回類型，它也會始終返回null。問：我如何環繞這種情況。我可以使用哪些替代方法？
public void fetchTokenfromCredentials(String name, String password){
JSONObject loginObject = new JSONObject();
try{
loginObject.put("email", email);
loginObject.put("password", password);
} catch(JSONException e) {
e.printStackTrace();
}
// assume predefined url and params
JsonObjectRequest loginRequest = new HeaderRequest(Request.Method.POST, url + params, loginObject,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONObject headers = response.getJSONObject("headers");
// A simple use class that stores the id, username etc.
user = new User(response.getInt("id"), response.getString("name"), response.getString("authentication_token"), response.getString("email"));
// Previous code started a new main activity intent here
} catch(JSONException e){
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.d(TAG,"Failed response");
}
});
RequestQueueSingleton.getInstance(this.getApplicationContext()).addToRequestQueue(loginRequest);
}