Dagger 2 NPE when trying to make member injection of interface type

Question

I have problem with member injecting interface type.

Here is example: I have interface let's call it BookActivity

interface BookActivity {}

it's simple marker interface that do nothing.

and I have two implementation:

BookNewActivity: Activity, BookActivity {

    @Inject someField: SomeField;

    override fonCreate(savedInstanceState:Bundle?) {
        activityComponent.inject(this)
    }

}

BookOldActivity: Activity, BookActivity {
    @Inject someField: SomeField;

override fonCreate(savedInstanceState:Bundle?) {
        activityComponent.inject(this)
    }
}

interface ActivityComponent {
    fun inject(BookActivity)
}

When I try to get access to someField I get NPE because dagger did not inject SomeField in my class. How can I solve this problem?

Could you add a stack trace. Does it happen in runtime ? How did you call inject (show an example) ? — Ruokki, Dec 15 '20 at 13:44
@Ruokki Yes. it happens in runtime. I just updated question to show how I call inject — d.popovych, Dec 15 '20 at 14:34

score 0 · Answer 1 · answered Dec 17 '20 at 22:30

0

Not sure, but this will be probably problem with dagger understanding the parent interface. You can try to have 2 inject methods for each Activity.

If an interface could have properties, you could have it there, but that's not possible :(

answered Dec 17 '20 at 22:30

mlykotom

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Dagger 2 NPE when trying to make member injection of interface type

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