Unable to show barcode scanned text into my autocomplete text view - android-studio

Question

I have implemented a barcode scanner by using Tutorial how to create Barcode Reader app in Android Studio. The tutorial has used zxing integration. I am able to configure the barcode app.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal"
android:padding="2dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left|center_vertical"
android:text="Smart MSN #" />
<AutoCompleteTextView
android:id="#+id/smart_msn_spinner"
android:layout_width="157dp"
android:layout_height="wrap_content"
android:layout_gravity="left|center_vertical"
android:inputType="number" />
<ImageButton
android:id="#+id/start_scan"
android:layout_width="66dp"
android:layout_height="match_parent"
android:background="#color/white"
app:srcCompat="#drawable/ic_baseline_qr_code_scanner_24" />
</LinearLayout>
public class NewFormFragment extends Fragment {
#BindView(R.id.start_scan)
ImageButton startScan;
#BindView(R.id.smart_msn_spinner)
AutoCompleteTextView smartMsnSpinner;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
bindListners();
}
private void bindListners() {
.
.
.
.
startScan.setOnClickListener(startScanning);
}
private final View.OnClickListener startScanning = v -> {
if(v.getId()==R.id.start_scan){
IntentIntegrator scanIntegrator = new IntentIntegrator(getActivity());
scanIntegrator.initiateScan();
}
};
public void onActivityResult(int requestCode, int resultCode, Intent data) {
IntentResult scanningResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if (scanningResult != null) {
String scanContent = scanningResult.getContents();
String scanFormat = scanningResult.getFormatName();
//smartMsnSpinner.setText("FORMAT: " + scanFormat);
smartMsnSpinner.setText(scanContent);
}
}
}
When I start my application and click on the scan button I am able to scan a barcode. But After scanning I am seeing nothing in my AutoCompleteTextView i.e. smartMsnSpinner.
While debugging I saw that right after scanning the breakpoint never hits the onActivityResult
I must be missing something that I don't know.
Any help would be highly appreciated.