Main Activity Context Menu

package com.yoesuv.democontextmenu;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.ContextMenu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private Toolbar toolbar;
    private ListView listView;
    private ArrayAdapter<String> adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        if(getSupportActionBar()!=null){
            getSupportActionBar().setElevation(5);
        }

        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1);
        for(int i=1;i<=20;i++){
            adapter.add("Data ke "+i);
        }
        listView = (ListView) findViewById(R.id.listView);
        listView.setAdapter(adapter);
        registerForContextMenu(listView);
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);
        AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
        menu.setHeaderTitle(adapter.getItem(info.position));
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu_context, menu);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        int id = item.getItemId();
        if(id==R.id.detail){
            Toast.makeText(MainActivity.this, "Menu Detail", Toast.LENGTH_SHORT).show();
        }else if(id==R.id.edit){
            Toast.makeText(MainActivity.this, "Menu Edit", Toast.LENGTH_SHORT).show();
        }else if(id==R.id.delete){
            Toast.makeText(MainActivity.this, "Menu Delete", Toast.LENGTH_SHORT).show();
        }
        return super.onContextItemSelected(item);
    }
}