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I have 4 Activities A -> B-> C -> D

from Activity D I want to go back to B

here is the code

manifest:
<activity android:name=".GetAttendance" android:launchMode="singleTask"/>

.

Activity D
Intent intent = new Intent(AddNewGuest.this, GetAttendance.class);
 intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
 intent.putExtra("guest", temp);// temp is an object
 setResult(600, intent);
 startActivity(intent);

on Activity B, I am calling:

 protected void onActivityResult(int requestCode, int resultCode, Intent data) 
 super.onActivityResult(requestCode, resultCode, data);
 System.out.println("requestCode:"+requestCode+" resultCode:"+resultCode);

But I am getting the requestCode equals to 1000 where it I am sending it 600

However, when Activity B calls C and before going to D I'm setting requestcode to 1000 startActivityForResult(intent, 1000);

any suggestion?

You are sending a requestCode of 1000, which can be seen from your startActivityForResult(intent, 1000); statement

You were expecting a 600, but the call to setResult(600, intent); is setting the result code to 600

This is different because you are expecting for a request code, whereas the 600 value is for result code

https://developer.android.com/reference/android/app/Activity#setResult(int,%20android.content.Intent)