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observeAsState 和 collectAsState 之间的区别以及何时在 Android Jetpack Compose 中使用它们？

[英]Difference between observeAsState and collectAsState and when to use each in Android Jetpack Compose?

 原文  2022-09-07 08:28:23  6   2    android/ android-jetpack-compose/ state-management

问题描述

I am learning Jetpack Compose but facing some issues in understanding states.我正在学习 Jetpack Compose，但在理解状态方面遇到了一些问题。 Can someone explain these two?有人可以解释这两个吗？ observeAsState and collectAsState. observeAsState 和 collectAsState。 Thank you.谢谢你。

2 个解决方案

解决方案1
 3  2022-09-07 08:58:49

  1. observeAsState is an extension on LiveData . observeAsState是LiveData的扩展。
    Starts observing this LiveData and represents its values via State .开始观察这个LiveData并通过State表示它的值。
    Uses Lifecyle internally for safely observing the data.在内部使用Lifecyle来安全地观察数据。

  2. collectAsState is an extension on StateFlow . collectAsState是StateFlow的扩展。
    Collects values from this StateFlow and represents its latest value via State.从此StateFlow收集值并通过 State 表示其最新值。
    You need to handle the collection as per appropriate Lifecyle .您需要根据适当的Lifecyle处理集合。

Source: Compose#LiveData & Compose#Flow .来源： Compose#LiveData和Compose#Flow 。

解决方案2
 0  2023-01-09 15:25:11

An addition of Darshan´s answer is that in version 2.6.0-alpha.1 we have a new extension function that takes care of lifecylce when collecting StateFlow. Darshan 的另一个答案是，在版本 2.6.0-alpha.1 中，我们有一个新的扩展 function，它在收集 StateFlow 时处理生命周期。

Link of release notes: https://developer.android.com/jetpack/androidx/releases/lifecycle?hl=es-419#2.6.0-alpha01发行说明链接： https://developer.android.com/jetpack/androidx/releases/lifecycle?hl=es-419#2.6.0-alpha01

Example of use.使用示例。 https://medium.com/tech-takeaways/how-to-safely-collect-flows-lifecycle-aware-in-jetpack-compose-a-new-approach-ed20ead25be9 https://medium.com/tech-takeaways/how-to-safely-collect-flows-lifecycle-aware-in-jetpack-compose-a-new-approach-ed20ead25be9

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