onActivityResult method not being called Android

I found the mistake. I had below line in manifest.xml for child acitivity.

        android:launchMode="singleInstance"

after removing this line. it's working like a charm!!!

Thank You all for your input and suggestions.

For anyone stuck with same problem, a symptom not to receive onActivityResult, following cases can cause this issue.

• check you are using startActivityForResult() correctly, do not use startActivity().
• if you do something in overriden onBackPressed method, super.onBackPressed(); has to be positioned at the last of the method, not at the first line. (my case to spend 5 hours)
• remove android:launchMode="singleInstance" in manifest or equivalent argument to create a intent.
• remove noHistory="true" in manifest of the callee activity.
• check setResult() is missed.
• finish() is called to close the activity. use finishActivity() to close callee activity.
• use requestCode more than zero. negative value does not work.

Not sure if this is your case, but when starting the child activity make sure you use startActivityForResult(intent), instead of startActivity();

My case was a little bit complex and I realized that I used by error a static reference pointing to the first instance of the buttons listeners in a sub activity.

At the first turn it was working, but when the user was returning from the parent activity, onActivityResult was not called.

Replacing the static references was the fix