How to make Entry Point of Hilt in Separate class not a Fragment or Activity?

Question

I Have Separate Class I want to put inject in its body, but it's not allowed to make it A EntryPoint Because it's not a Fragment or Activity so Injection must be in Fragment or Activity

Answer 1

so Injection must be in Fragment or Activity

This is incorrect, Injection can be done anywhere as long as the EntryPoint whether it was a Fragment or Activity is annotated with @AndroidEntryPoint .

For example, If you have Class A that is a member of the MainActivity, and ClassB that is a dependency of Class A. So as long as MainActivity is annotated with @AndroidEntryPoint you can Inject ClassA into MainActivity and ClassB into ClassA.

@AndroidEntryPoint
class MainActivity : AppCompatActivity() {

    @Inject
    lateinit var classA: ClassA

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

}


class ClassA @Inject constructor(){
    @Inject
    lateinit var classB: ClassB

    fun test() = classB.test()
}


class ClassB @Inject constructor(){
    fun test() = println("Hello World")

}

Output : Hello World