Demo Listview Android

package com.yoesuv.demolistview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
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 ListView lV;
    private String[] data;
    private ArrayAdapter adapter;

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

        data = getResources().getStringArray(R.array.android);
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, data);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        if(getSupportActionBar()!=null){
            getSupportActionBar().setElevation(5);
        }

        lV = (ListView) findViewById(R.id.listView_android);
        lV.setAdapter(adapter);
        lV.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Toast.makeText(view.getContext(), adapter.getItem(position).toString(), Toast.LENGTH_SHORT).show();
            }
        });
    }
}