安卓架构组件 : Multiple instances of the same view model

Question

我是 Android 架构组件的新手，我已阅读 this教程。我对它所说的部分感兴趣:

This allows you to have an app that opens a lot of different instances of the same Activity or Fragment, but with different ViewModel information. Let’s imagine if we extended our Court-Counter example to have the scores for multiple basketball games. The games are presented in a list, and then clicking on a game in the list opens a screen that looks like our current MainActivity, but which I’ll call GameScoreActivity.

假设我有一个 ViewModel MyViewModel。我想创建这个 View 模型的列表，但直到运行时我才知道这个列表中的元素数量。在 for 循环中创建 View 模型实例方便吗？我可以创建多少个实例？实例数会影响性能吗？

Answer 1

ViewModel 提供程序采用可选的键，您可以使用它来区分 ViewModel 实例。