如何用活动结果 API 替换 startActivityForResult? [英] How to replace startActivityForResult with Activity Result APIs?

问题描述

我有一个主要活动，它根据条件作为调用不同活动的入口点.其中，我使用 Firebase Auth 来管理用户登录:

I have a main activity which serves as an entry point to call different activities, depending on condition. Among others, I use Firebase Auth to manage user sign in:

startActivityForResult(
            AuthUI.getInstance().createSignInIntentBuilder()
                    .setAvailableProviders(providers)
                    .build(),
            RC_SIGN_IN)

我覆盖了onActivityResult()来区分返回的intent/data，例如:

I overwrite onActivityResult() to distinguish the returned intent/data, for example:

 override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    when (requestCode) {

        REQUEST_CODE_1 -> {
          // update UI and stuff
        }

        RC_SIGN_IN -> {
          // check Firebase log in
        }
        // ...
    }
}

使用 文档 强烈推荐的 Activity Result API，我知道我应该在 ActivityResultLauncher 之前制作 prepareCall() 并确保启动时活动处于创建状态，但我仍然不明白如何处理多个活动像 onActivityResult() 一样优雅地(至少在一个地方)结果.

With the Activity Result APIs which is strongly recommended by the documentation, I get that I should make prepareCall() before ActivityResultLauncher and to make sure the activity is in created state when I launch, but I still don't understand how to handle multiple activity results gracefully (at least, in one place) like in onActivityResult().

看这篇文章，看来我需要实现多个 ActivityResultContract 类型的子内部类(因此有多个prepareCall()?)，因为它们被假设为不同的合同，我说得对吗?有人可以向我展示一些反映上述 onActivityResult() 逻辑的骨架示例吗?

Looking at this article, it seems I need to implement multiple child inner classes of ActivityResultContract type (therefore multiple prepareCall()'s?), because they are suppose to be different contracts, am I correct? Can someone please show me some skeleton example that mirrors the above onActivityResult() logic?

推荐答案

您可以根据需要调用任意数量的活动以获得结果，并为每个活动提供单独的回调:

You can call as many Activities for result as you wish and have separate callback for each:

    val startForResult = registerForActivityResult(ActivityResultContracts.StartActivityForResult())
    { result: ActivityResult ->
        if (result.resultCode == Activity.RESULT_OK) {
            //  you will get result here in result.data
            }

        }
    }

    startForResult.launch(Intent(activity, CameraCaptureActivity::class.java))

您只需要指定 Activity 类 - CameraCaptureActivity::class.java

You just need to specify Activity class - CameraCaptureActivity::class.java

更新:

prepareCall() 方法已在 Activity 1.2.0-alpha04 和 Fragment 1.3.0-alpha04 中重命名为 registerForActivityResult().最后一行应该是 startForResult.launch(...)

感谢Rafael Tavares 更新

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