Flow 1: Complete flow in MCQ

flow2.kt

class A: AppCompatActivity() {
  ..
  fun startB() {
    ..
    startActivityForResult(intent, REQ_CODE)
  }
  
  override onActivityResult(intent, reqCode, ..) {
    if(reqCode == REQ_CODE) {
      when(intent.getString("source")) {
        "B" -> btn.text = "Continute"
        "D" -> btn.text = "Review"
      }
    }
  }
  
}

class B: AppCompatActivity() {
  ..
  fun startC() {
    ..
    intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT)
    startActivity(intent, REQ_CODE)
  }
}

class C: AppCompatActivity() {
  ..
  fun startD() {
    ..
    intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT)
    startActivity(intent, REQ_CODE)
  }
}

class D: AppCompatActivity() {
  ..
  fun clickBack() {
    ..
    intent.put("source", "D")
    setResult(RESULT_OK, intent)
    finish()
  }
}