1、修改路径：packages/apps/Settings/src/com/android/settings/accounts/AccountSyncSettings.java

2、修改方法：

public class AccountSyncSettings extends AccountPreferenceBase {
                 syncPref.setSummary("");
             }
             int syncState = ContentResolver.getIsSyncable(account, authority);
             syncPref.setActive(activelySyncing && (syncState >= 0) &&
-                    !initialSync);
+                    !initialSync && (syncEnabled));
             syncPref.setPending(authorityIsPending && (syncState >= 0) &&
-                    !initialSync);
+                    !initialSync && (syncEnabled));

联系人-选项-账户-进入已添加的账户，勾选联系人，点击选项立即同步，邮件项未勾选也会显示同步