如何在Kotlin中注入原始变量? [英] How to inject primitive variables in Kotlin?

问题描述

我在Android应用中使用Dagger2 for DI，并使用以下代码将类注入到Activity中很好:

I am using Dagger2 for DI in my Android app, and using this code for injecting classes into my Activity is fine:

@field:[Inject ApplicationContext]
lateinit var context: Context

但是，Kotlin的原始类型属性(例如Boolean)不允许使用lateinit修饰符，我该怎么做?

but, lateinit modifier is not allowed on primitive type properties in Kotlin (for instance Boolean), how can I do something like this?

@field:[Inject Named("isDemo")]
lateinit var isDemo: Boolean

当我从此代码中删除lateinit时，出现此错误Dagger does not support injection into private fields

when I remove lateinit from this code I get this error Dagger does not support injection into private fields

推荐答案

首先，您不需要lateinit，可以将其保留为var，并使用任意值进行初始化. 其次，您必须公开一个字段，以允许Dagger注入该字段. 所以，这是解决方案:

First, you don't need lateinit, you can leave it as a var, and initialize with an arbitrary value. Second, you must expose a field in order to allow Dagger to inject there. So, here's the solution:

@JvmField // expose a field
@field:[Inject Named("isDemo")] // leave your annotatios unchanged
var isDemo: Boolean = false // set a default value

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