I have a problem trying to change a TextView through a callback using an object provided by Dagger2. If I make the instance of the same object of the common form (new Object ..) everything works. But if it is done through the dagger instance the TextView NullPointerException appears. I think the problem is in the module in the way that the MainActivity context happened but I'm not sure.

The Activity

class MainActivity : AppCompatActivity(), MyCallBack{

        @Inject
        lateinit var myObject: MyObject

        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main)

            mytextview.text = "first change"

            val myComponent = (application as App).myComponent
            myComponent.inject(this)

        }

        override fun callBack(string: String) {
            try {
                mytextview.text = string
            } catch (e: Exception) {
                Log.d("xxx", e.toString())
            }
        }
    }

Objecto with the callback

    class MyObject(var res: MyCallBack) {
    init {
        res.callBack("second change")
    }
}

Dagger component

@Component(modules = MyModule.class)
public interface MyComponent {

    void inject(MainActivity mainActivity);
}

Dagger module

@Module
class MyModule {

@Provides
fun proviesMyObject(): MyObject = MyObject(MainActivity())
}