初始化空的 ByteArray [英] Initialize empty ByteArray

问题描述

如何在 Kotlin 中初始化一个空的 ByteArray?每当我尝试这样做时:

val asdfasdf : ByteArray

我被告知，当我稍后在这里尝试使用它时需要初始化 asdfasdf:

mVisualizer.getWaveForm(asdfasdf)

<块引用>

必须初始化变量 'asdfasdf'

解决方案

您的 val asdfasdf : ByteArray 只是需要初始化的不可变声明.如果你事先知道大小，你可以像这样初始化它 val asdfasdf : ByteArray = ByteArray(10) 但是你可能需要这样的东西 val asdfasdf = arrayListOf<Byte>() 能够动态地向其中添加项目.

How do you initialize an empty ByteArray in Kotlin? Whenever I try to do this:

val asdfasdf : ByteArray

I get told that I need to initialize asdfasdf when I try to use it later here:

mVisualizer.getWaveForm(asdfasdf)

Variable 'asdfasdf' must be initialized

解决方案

Your val asdfasdf : ByteArray is just declaration of immutable that needs to be initialized. If you know size in advance, you can init it like this val asdfasdf : ByteArray = ByteArray(10) however you probably need something like this val asdfasdf = arrayListOf<Byte>() to be able add items into it dynamically.

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