设置帐户同步指示器红色（或其他颜色）

Question

我试图使用AccountAuthenticator和SyncAdapter指示帐户的身份验证/同步状态。我已经通过了样本，并能够正常工作。

如何将指标设置为红色，就像GMail帐户一样？

我还想在同步适配器页面上添加其他状态指示器。见下图：

Answer 1

回答我的问题对未来团队的知识......

获取指示灯变色后，被一些实验相当容易。首先创建一个基于SDK示例项目中提供的代码的项目，修改如下：

1）假冒在AuthenticationActivity期间从服务器初始登录。一旦经过初始检查，系统将启动它的定期同步尝试。

/** 
* 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。这里的关键是“syncResult.stats”字段。在修改它们时，我发现插入多个错误并没有达到我想要的效果。还注意到计数似乎没有在同步尝试中被记录（即，失败总是以零为单位）。 “lifetimeSyncs”是一个静态变量，可以在同步尝试中保持计数。此修改后的代码将继续绿色和红色之间交替......

@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); 
    } 

} 

就是这样，享受与延迟和其他变量打太...