Native初始化,主要流程:ReactNativeHost -> Activity -> ReactRootView -> startReactApplication -> createReactContextInBackground(期间有模块/UI组件信息收集、JSC初始化等工作)
后台异步加载、执行JSBundle
Native端执行setupReactContext初始化React上下文,调用JS端AppRegistry.runApplication(key,params),key为模块/组件名称,参数