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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
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
when I remove lateinit from this code I get this error Dagger does not support injection into private fields
867
@Inject is a Java annotation for describing the dependencies of a class that is part of Java EE (now called Jakarta EE). It is part of CDI (Contexts and Dependency Injection) which is a standard dependency injection framework included in Java EE 6 and higher.
Kotlin uses two different keywords to declare variables: val and var . Use val for a variable whose value never changes. You can't reassign a value to a variable that was declared using val . Use var for a variable whose value can change.
Kotlin doesn't have primitive type (I mean you cannot declare primitive directly). It uses classes like Int , Float as an object wrapper for primitives. When kotlin code is converted to jvm code, whenever possible, "primitive object" is converted to java primitive.
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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