Kotlin“也" Android Studio中功能奇怪的警告 [英] Kotlin "also" function strange warning in Android Studio

问题描述

大概有两个相同的代码段:

There is two presumably identical snippets:

// Verbose version
val typedArray = context.obtainStyledAttributes(attrs, styleable)
block(typedArray)
typedArray.recycle()

// One-line version
context.obtainStyledAttributes(attrs, styleable).also(block).recycle()

我想知道为什么冗长的代码块在Android Studio中看起来不错，而单行版本突出显示 obtainStyledAttributes 并给出以下警告:

I'm wonder why verbose block of code looks fine to Android Studio, whereas one-line version highlights obtainStyledAttributes and gives following warning:

此TypedArray应与#recycle()一起使用后再利用

This TypedArray should be recycled after use with #recycle()

有人知道这仅仅是一个Android Studio的皮棉检查缺陷还是单行版本实际上有问题吗?

Does anyone know is it just an Android Studio lint check flaw or something is actually wrong with one-line version?

推荐答案

这有点猜测，但是我相信这是因为静态分析工具不能保证also()返回的TypedArray是与obtainedStyledAttributes()返回的实例相同.它看到获得了TypedArray，但不能保证它被回收，因此发出警告.

This is a bit of a guess, but I believe it's because the static analysis tool can't guarantee that the TypedArray returned by also() is the same instance as the one returned by obtainedStyledAttributes(). It sees that a TypedArray is obtained but can't guarantee that it is recycled, so it issues the warning.

我会毫不犹豫地称其为短毛绒中的错误(或缺陷")，但这确实意味着在这种情况下可以忽略警告.

I would hesitate to call this a bug (or "flaw") in the linter, but it does mean that the warning can be ignored in this case.

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