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