JetPack Compose中如何将AndroidView实例传入SearchEngineUiAdapter

要在Compose中获取AndroidView创建的SearchResultsView实例，并将其传入SearchEngineUiAdapter，可以通过保存View实例引用的方式实现，具体步骤如下：

方法一：用状态保存View实例，延迟创建Adapter #

1. 定义可记忆的状态保存SearchResultsView引用，确保Compose重组时不会丢失实例：

val searchResultsView = remember { mutableStateOf<SearchResultsView?>(null) }

2. 基于View实例创建SearchEngineUiAdapter，通过remember绑定依赖，确保View准备好后才初始化Adapter：

val searchEngineUiAdapter = remember(searchResultsView.value, searchEngine, offlineSearchEngine) {
    searchResultsView.value?.let { view ->
        SearchEngineUiAdapter(
            view = view,
            searchEngine = searchEngine,
            offlineSearchEngine = offlineSearchEngine
        )
    }
}

3. 在AndroidView的factory中初始化View，并将实例赋值给状态：

AndroidView(
    factory = { context ->
        SearchResultsView(context).apply {
            initialize(
                SearchResultsView.Configuration(
                    CommonSearchViewConfiguration(DistanceUnitType.IMPERIAL)
                )
            )
            searchResultsView.value = this
        }
    },
    modifier = Modifier
        .fillMaxWidth()
        .background(color = Color.Blue)
)

方法二：在View创建时直接初始化Adapter #

如果不需要单独持有View实例，可以直接在AndroidView的factory中创建并保存Adapter：

val searchEngineUiAdapter = remember { mutableStateOf<SearchEngineUiAdapter?>(null) }

AndroidView(
    factory = { context ->
        SearchResultsView(context).apply {
            initialize(
                SearchResultsView.Configuration(
                    CommonSearchViewConfiguration(DistanceUnitType.IMPERIAL)
                )
            )
            // 直接在View创建时初始化Adapter并保存
            searchEngineUiAdapter.value = SearchEngineUiAdapter(
                view = this,
                searchEngine = searchEngine,
                offlineSearchEngine = offlineSearchEngine
            )
        }
    },
    modifier = Modifier
        .fillMaxWidth()
        .background(color = Color.Blue)
)

注意事项 #

• remember的依赖列表要包含所有影响Adapter初始化的变量（如searchEngine、offlineSearchEngine），确保变量变化时能重新创建Adapter。
• AndroidView的factory仅在View首次创建时执行，在此处初始化View和Adapter不会重复执行。

内容的提问来源于stack exchange，提问作者Jitendra Prajapati