3 Activities, 3 AndroidEntryPointes, using ActivityRetainedScoped

Activities.kt

@AndroidEntryPoint
class MainActivity : AppCompatActivity() {

    @Inject
    lateinit var emailSender: EmailSender

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.main_activity)
        println("From $this EmailSender is $emailSender")
        startActivity(Intent(this, SecondActivity::class.java))
    }
}

@AndroidEntryPoint
class SecondActivity : AppCompatActivity() {

    @Inject
    lateinit var emailSender: EmailSender

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.main_activity)
        println("From $this EmailSender is $emailSender")
        startActivity(Intent(this, ThirdActivity::class.java))
    }
}

@AndroidEntryPoint
class ThirdActivity : AppCompatActivity() {

    @Inject
    lateinit var emailSender: EmailSender

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.main_activity)
        println("From $this EmailSender is $emailSender")
    }
}

CodeGen.java

      private MainActivity injectMainActivity2(MainActivity instance) {
        MainActivity_MembersInjector.injectEmailSender(instance, ActivityRetainedCImpl.this.getEmailSender());
        return instance;
      }

      private SecondActivity injectSecondActivity2(SecondActivity instance) {
        SecondActivity_MembersInjector.injectEmailSender(instance, ActivityRetainedCImpl.this.getEmailSender());
        return instance;
      }

      private ThirdActivity injectThirdActivity2(ThirdActivity instance) {
        ThirdActivity_MembersInjector.injectEmailSender(instance, ActivityRetainedCImpl.this.getEmailSender());
        return instance;
      }

EmailSender.kt

@ActivityRetainedScoped
class EmailSender @Inject constructor() {
    fun send(msg: String){
        println(msg)
    }
}

RESULT

2021-01-05 11:04:11.546 13617-13617/? I/System.out: From MainActivity@f7cddaa EmailSender is EmailSender@3ade714
2021-01-05 11:04:12.041 13617-13617/? I/System.out: From SecondActivity@8403e57 EmailSender is EmailSender@5776b47
2021-01-05 11:04:12.664 13617-13617/? I/System.out: From ThirdActivity@7433d36 EmailSender is EmailSender@8b35fe6