設置帳戶同步指示器紅色（或其他顏色）

Question

我試圖使用AccountAuthenticator和SyncAdapter指示帳戶的身份驗證/同步狀態。我已經通過了樣本，並能夠正常工作。

如何將指標設置爲紅色，就像GMail帳戶一樣？

我還想在同步適配器頁面上添加其他狀態指示器。見下圖：

Answer 1

回答我的問題對未來團隊的知識......

獲取指示燈變色後，被一些實驗相當容易。首先創建一個基於SDK示例項目中提供的代碼的項目，修改如下：

1）假冒在AuthenticationActivity期間從服務器初始登錄。一旦經過初始檢查，系統將啓動它的定期同步嘗試。

/** 
* Called when the authentication process completes (see attemptLogin()). 
*/ 
public void onAuthenticationResult(boolean result) { 
    Log.i(TAG, "onAuthenticationResult(" + result + ")"); 
    // Hide the progress dialog 
    hideProgress(); 
    // Override the result, we don't care right now.... 
    result = true; 
    if (result) { 
     if (!mConfirmCredentials) { 
      finishLogin(); 
     } else { 
      finishConfirmCredentials(true); 
     } 
    } else { 
     Log.e(TAG, "onAuthenticationResult: failed to authenticate"); 
     if (mRequestNewAccount) { 
      // "Please enter a valid username/password. 
      mMessage.setText(getText(R.string.login_activity_loginfail_text_both)); 
     } else { 
      // "Please enter a valid password." (Used when the 
      // account is already in the database but the password 
      // doesn't work.) 
      mMessage.setText(getText(R.string.login_activity_loginfail_text_pwonly)); 
     } 
    } 
} 

2）修改SyncAdapter中的「onPerformSync（）」方法。這裏的關鍵是「syncResult.stats」字段。在修改它們時，我發現插入多個錯誤並沒有達到我想要的效果。還注意到計數似乎沒有在同步嘗試中被記錄（即，失敗總是以零爲單位）。 「lifetimeSyncs」是一個靜態變量，可以在同步嘗試中保持計數。此修改後的代碼將繼續綠色和紅色之間交替......

@Override 
public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) { 
    List<User> users; 
    List<Status> statuses; 
    String authtoken = null; 

    try { 
     // use the account manager to request the credentials 
     authtoken = mAccountManager.blockingGetAuthToken(account, Constants.AUTHTOKEN_TYPE, true); 
     // fetch updates from the sample service over the cloud 
     //users = NetworkUtilities.fetchFriendUpdates(account, authtoken, mLastUpdated); 
     // update the last synced date. 
     mLastUpdated = new Date(); 
     // update platform contacts. 
     Log.d(TAG, "Calling contactManager's sync contacts"); 
     //ContactManager.syncContacts(mContext, account.name, users); 
     // fetch and update status messages for all the synced users. 
     //statuses = NetworkUtilities.fetchFriendStatuses(account, authtoken); 
     //ContactManager.insertStatuses(mContext, account.name, statuses); 

     if (SyncAdapter.lifetimeSyncs-- <= 0){ 
      //mAccountManager.invalidateAuthToken(Constants.ACCOUNT_TYPE, authtoken); 
      syncResult.stats.numAuthExceptions++; 
      //syncResult.delayUntil = 60; 
      lifetimeSyncs = 5; 
     } 


    } catch (final AuthenticatorException e) { 
     syncResult.stats.numParseExceptions++; 
     Log.e(TAG, "AuthenticatorException", e); 
    } catch (final OperationCanceledException e) { 
     Log.e(TAG, "OperationCanceledExcetpion", e); 
    } catch (final IOException e) { 
     Log.e(TAG, "IOException", e); 
     Log.d(TAG, extras.toString()); 
     syncResult.stats.numAuthExceptions++; 
     syncResult.delayUntil = 60; 
     //extras.putString(AccountManager.KEY_AUTH_FAILED_MESSAGE, "You're not registered"); 
    } catch (final ParseException e) { 
     syncResult.stats.numParseExceptions++; 
     Log.e(TAG, "ParseException", e); 
    } 

} 

就是這樣，享受與延遲和其他變量打太...