GoogleAccountCredential getSelectedAccountName（）在設置並執行權限後返回空值

我正在使用CONTACTS組中的GET_ACCOUNTS權限，並且還在我的代碼中處理它。我只是不知道爲什麼帳戶名稱設置後仍爲空。該應用程序已具有權限，因爲沒有彈出對話框來告訴用戶授予權限。GoogleAccountCredential getSelectedAccountName（）在設置並執行權限後返回空值

我將憑證在OnCreate像這樣：

 mCredential = GoogleAccountCredential.usingOAuth2(
       getApplicationContext(), Arrays.asList(SCOPES)) 
       .setBackOff(new ExponentialBackOff());

這裏就是我試圖設置名稱：

/** 
* Attempts to set the account used with the API credentials. If an account 
* name was previously saved it will use that one; otherwise an account 
* picker dialog will be shown to the user. Note that the setting the 
* account to use with the credentials object requires the app to have the 
* GET_ACCOUNTS permission, which is requested here if it is not already 
* present. The AfterPermissionGranted annotation indicates that this 
* function will be rerun automatically whenever the GET_ACCOUNTS permission 
* is granted. 
*/ 
@AfterPermissionGranted(REQUEST_PERMISSION_GET_ACCOUNTS) 
    private void chooseAccount() { 
     if (EasyPermissions.hasPermissions(
       this, Manifest.permission.GET_ACCOUNTS)) { 

      String accountName = getPreferences(Context.MODE_PRIVATE) 
        .getString(PREF_ACCOUNT_NAME, null); 
      if (accountName != null) { 
       mCredential.setSelectedAccountName(accountName); // I set the account name here 

       Log.d("MESSAGE", accountName); // this prints out the account name as an email 
       Log.d("MESSAGE", mCredential.getSelectedAccountName()); // this throws a null pointer 

       getResultsFromApi(); 
      } else { 
       // Start a dialog from which the user can choose an account 
       Log.d("MESSAGE", "Start dialogue box to select account"); 
       startActivityForResult(
         mCredential.newChooseAccountIntent(), 
         REQUEST_ACCOUNT_PICKER); 
      } 
     } else { 
      // Request the GET_ACCOUNTS permission via a user dialog 
      Log.d("MESSAGE", "Creates dialogue box to request permission"); 
      EasyPermissions.requestPermissions(
        this, 
        "This app needs to access your Google account (via Contacts).", 
        REQUEST_PERMISSION_GET_ACCOUNTS, 
        Manifest.permission.GET_ACCOUNTS); 
     } 
    }

以下是清單文件我的權限：

<uses-permission android:name="android.permission.INTERNET" /> 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />

這是我第一個項目，我不是很有經驗。任何幫助將不勝感激！！

來源

2017-08-02 Jeffrey Wongo

您正在使用首選項來獲取帳戶名稱，但您尚未將其保存在任何地方。你有沒有把它保存在偏好中？ –

是的，它保存在首次啓動應用程序時調用的方法中創建的首選項。它在從用戶請求帳戶名稱後，將該帳戶名稱保存在該首選項中。上述方法訪問已存在的首選項。帳戶名稱保存在字符串中。它只是不會讓我把它設置爲憑證。 –

在mCredential.setSelectedAccountName（accountName）中傳遞它之前，accountName的值是多少？？ – noogui

我有同樣的問題。用戶setSelectedAccount（）而不是setSelectedAccountName（）。

mCredential = GoogleAccountCredential.usingOAuth2(
       getApplicationContext(), Arrays.asList(SCOPES)) 
       .setBackOff(new ExponentialBackOff()); 

     // to set accountName manually instead of prompting user to select it 
     mCredential.setSelectedAccount(new Account("[email protected]", "come.android.example"));

將gmail帳戶作爲第一個參數，並將包名稱作爲第二個參數。它應該工作。

來源

2018-01-13 14:59:03 Manpreet

GoogleAccountCredential getSelectedAccountName（）在設置並執行權限後返回空值

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