Android Studio 3.0-alpha8 中的 Kotlin apply() 扩展 lint 消息 [英] Kotlin apply() extension lint message in Android Studio 3.0-alpha8

问题描述

我有以下代码会产生以下 lint 错误.

fun newInstance(message: String?): DialogFragment {返回 DialogFragment().apply {参数 = Bundle().apply {putString("arg", 消息)}}}

该消息指出 apply() 函数中的 this 引用指向自 API 21 起可用的 BaseBundle 类，该类将在较低的 API.

引用 Bundle 类型而不是 BaseBundle.

为什么我们首先会出现 Lint 错误?

解决方案

一种解决方法是使用 let 而不是 apply，例如:

fun newInstance(message: String?): DialogFragment {返回 DialogFragment().apply {参数 = Bundle().let {it.putString("arg", 消息)它}}}

I have following code that produces following lint error.

fun newInstance(message: String?): DialogFragment {
    return DialogFragment().apply {
        arguments = Bundle().apply {
            putString("arg", message)
        }
    }
}

The message points out that this reference inside apply() function points to BaseBundle class that is available since API 21 which will crash on lower API. Bundle#putString(key, value) is definitely available on lower versions, but there is an error in Android Studio 3.0-alpha8.

The issue quite strange as I can see decompiled code as this:

Which do reference Bundle type not a BaseBundle.

Why do we have Lint error in first place?

解决方案

One workaround is to use let instead of apply, like:

fun newInstance(message: String?): DialogFragment {
    return DialogFragment().apply {
        arguments = Bundle().let {
            it.putString("arg", message)
            it
        }
    }
}

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