Android List & Detail

dengjiangszhan

于 2021-04-28 09:47:04 发布

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分类专栏：安卓文章标签： android

本文链接：https://blog.youkuaiyun.com/dengjiangszhan/article/details/116226236

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本文深入探讨了Android开发中常用的ListView和RecyclerView组件。这两种组件用于展示列表数据，它们从数据源获取数据并决定如何显示。适配器在其中起着关键作用，负责传递数据和布局信息给ListView或RecyclerView。当用户点击ListView的项时，可以通过适配器获取选中项，并启动新的Activity展示详细信息。了解这些组件的工作原理对于优化Android应用的性能至关重要。

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List,

ListView

RecyclerView

Adapters: Servants of the ListView

It fetches the items to be displayed from the data source

It decides how they should be displayed

It passes this information on to the ListView

val context = this
listView.setOnItemClickListener { _, _, position, _ ->
  // 1
  val selectedRecipe = recipeList[position]

  // 2
  val detailIntent = RecipeDetailActivity.newIntent(context, selectedRecipe)

  // 3
  startActivity(detailIntent)
}

Note: Before you dive into the explanation, make sure you understand the four arguments that are provided by onItemClick; they work as follows:

parent: The view where the selection happens — in your case, it’s the ListView
view: The selected view (row) within the ListView
position: The position of the row in the adapter
id: The row id of the selected item