How to set setOnItemLongClickListener for spinera items?

Question

Java

I want to put a context menu like "delete, edit" on spinner items on long press.
But, as it turned out, without additional squats, this possibility cannot be realized. Found a similar issue on overflow: stackoverflow.com/questions/2730610/how-can-i-use-spinner-setonitemlongclicklistener
The penultimate answer suggests a working solution, but I seem to be too dumb to figure it out without more help.
1) Create a custom spinner class by extending spinner
I understand how, but I don't understand why
2) Define an interface to handle clicks,
Ok, defined
3) In your spinner adapter class do these stuffs in getView and getDropDownView
I use this adapter:

ArrayAdapter<Category> adapter;
adapter = new ArrayAdapter<Category>(this, android.R.layout.simple_spinner_item,  lCategory);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);

I don't understand how to do this.
The following points 4 and 5 also cause difficulties.
Can someone explain in more detail, or make a demo?

Answer 1

It inherited from Spinner because the onDetachedFromWindow() method is protected, which means it is not accessible from the outside, so he made it public. If you do not call this method, the dropdown will not close after clicking on the item. If you don't want to inherit, you can use reflection like here https://stackoverflow.com/a/35759475
The above code works:

SpinnerAdapter

public class SpinnerAdapter extends BaseAdapter {

    private List<String> items;
    private LayoutInflater inflater;
    private ItemClickListener clickListener;

    public SpinnerAdapter(Context context, List<String> items, ItemClickListener clickListener){
        inflater = LayoutInflater.from(context);
        this.items = items;
        this.clickListener = clickListener;
    }

    @Override
    public int getCount() {
        return items.size();
    }

    @Override
    public Object getItem(int position) {
        return items.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        if(convertView == null) {
            convertView = inflater.inflate(R.layout.spinner_item, parent, false);
        }
        ((TextView)convertView).setText(items.get(position));
        convertView.setTag(position);
        convertView.setClickable(false);
        convertView.setLongClickable(false);
        
        return convertView;
    }


    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        convertView = getView(position, convertView, parent);
        convertView.setTag(position);

        convertView.setOnClickListener(v -> {
            if (clickListener != null) {
                clickListener.onItemClicked(v);
            }
        });

        convertView.setOnLongClickListener(v -> {
            if (clickListener != null) {
                clickListener.onItemLongClicked(v);
            }
            return true;
        });

        return convertView;
    }
}

ItemClickListener

public interface ItemClickListener {
    void onItemLongClicked(View view);
    void onItemClicked(View view);
}

MainActivity

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
        List<String> strings = new ArrayList<String>(){{
            add("John");
            add("James");
            add("Jake");
            add("Jane");
        }};

        CustomSpinner spinner = findViewById(R.id.spinner);

        spinner.setAdapter(new SpinnerAdapter(this, strings, new ItemClickListener() {
            @Override
            public void onItemLongClicked(View view) {
                spinner.onDetachedFromWindow();
                final int pos = (int) view.getTag();
                spinner.setSelection(pos);
                Toast.makeText(MainActivity.this, "regular click: "+strings.get(pos), Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onItemClicked(View view) {
                spinner.onDetachedFromWindow();
                final int pos = (int) view.getTag();
                spinner.setSelection(pos);
                Toast.makeText(MainActivity.this, "long click: "+strings.get(pos), Toast.LENGTH_SHORT).show();
            }

        }));
    }
}

spinner_item.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_marginTop="10dp"
    android:layout_marginBottom="10dp"
    android:layout_height="wrap_content">
</TextView>