sample_of_onActivityResult_with_TakeWhenObservable.kt

// Activity or Fragment

private val mResumeSignal = PublishSubject.create<Boolean>()
private val mResultSignal = PublishSubject.create<Any>()

override void onResume() {
    super.onResume();
    mResumeSignal.onNext(true);
}

override void onPause() {
    super.onPause();
    mResumeSignal.onNext(false);
}

override void onActivityResult(requestCode: Int, 
                               resultCode: Int, 
                               data: Intent) {
    mResultSignal.onNext(...);
}

// Postpone the moment of sending the result to your Presenter or domain 
// component regardless of handling save-restore
fun onGetResult(): Observable<Any> {
    return TakeWhenObservable(src = mResultSignal,
                              whenSrc = mResumeSignal,
                              bufferSize = 1)
}