جلسه چهاردهم لیست ساده

package ir.ben.frog;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class SimpleList extends AppCompatActivity {

        ArrayAdapter adapter;
        ListView lv;
        List<String> names;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_simple_list);
        lv= findViewById(R.id.listv);
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(SimpleList.this, names.get(position)+" is here", Toast.LENGTH_SHORT).show();
            }
        });
        names=new ArrayList<>();
        names.add("Hi");
        names.add("hello");
        names.add("jhjhk");
        names.add("hjhjkh");
        names.add("xcxc");
        names.add("poppo");
        names.add("qwqeq");
        names.add("xdygy");
        names.add("bhnhm");
        names.add("kmklkm");
        names.add("tytyt");
        names.add("iouiui");
        names.add("asasas");

        adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,names)
        /*{
            @NonNull
            @Override
            public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
                return super.getView(position, convertView, parent);
            }
        }*/
        ;
        lv.setAdapter(adapter);
        refresh();
    }

    private void refresh() {
         adapter.notifyDataSetChanged();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        menu.add("Add").setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                names.add("Heyyy");
                adapter.notifyDataSetChanged();
                return false;
            }
        });
        menu.add("Remove").setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                if(names.isEmpty())
                    return false;
                names.remove(names.size()-1);
                adapter.notifyDataSetChanged();
                return false;
            }
        });
        return super.onCreateOptionsMenu(menu);
    }


}