Flow 1: Partial flow in MCQ

flow1.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"
        ..
      }
    }
  }
  
}

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