UI引擎里AceAbility::OnStart函数1

这段代码是 AceAbility::OnStart方法的核心初始化部分，让我逐行解析其作用：

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​代码解析​

void AceAbility::OnStart(const Want& want, sptr<AAFwk::SessionInfo> sessionInfo)
{// 1. 调用父类Ability的默认OnStart实现Ability::OnStart(want, sessionInfo);// 2. 生成唯一的容器IDabilityId_ = Container::GenerateId<FA_CONTAINER>();// 3. 确保某些初始化操作只执行一次static std::once_flag onceFlag;// 4. 获取Ability上下文对象auto abilityContext = GetAbilityContext();// 5. 获取应用缓存目录路径auto cacheDir = abilityContext->GetCacheDir();

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​详细功能说明​

​1. 父类初始化​

Ability::OnStart(want, sessionInfo);

• ​作用​：执行 Ab