Java Android Program to Demonstrate adding actions to Navigation Bar in Android

package com.example.nav_bar;
 
import android.app.Activity;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
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 Activity {
 
    private String[] titles;
    private DrawerLayout drawer_layout;
    private ListView drawer_content;
    private CharSequence main_title;
    private ActionBarDrawerToggle action_drawer_toggle;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        main_title = "test";
 
        titles = new String[] { "one", "two", "three" };
        drawer_layout = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer_content = (ListView) findViewById(R.id.left_drawer);
 
        drawer_content.setAdapter(new ArrayAdapter<String>(this,
                R.layout.drawer_list_item, titles));
 
        drawer_content.setOnItemClickListener(new DrawerItemClickListener());
 
        action_drawer_toggle = new ActionBarDrawerToggle(this, /* Main Activity */
        drawer_layout, /* DrawerLayout object */
        R.drawable.ic_drawer, /* the hamburger */
        R.string.open, /* open description */
        R.string.close /* close description */
        ) {
            /* on close drawer */
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(main_title);
            }
 
            /* drawer is in a open state. */
            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(main_title);
            }
        };
 
        drawer_layout.setDrawerListener(action_drawer_toggle);
 
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);
 
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        action_drawer_toggle.syncState();
    }
 
    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        action_drawer_toggle.onConfigurationChanged(newConfig);
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (action_drawer_toggle.onOptionsItemSelected(item)) {
            return true;
        }
 
        return super.onOptionsItemSelected(item);
    }
 
    private void selectItem(int position) {
        Toast.makeText(this, R.string.app_name, Toast.LENGTH_SHORT).show();
        drawer_content.setItemChecked(position, true);
        setTitle(titles[position]);
        drawer_layout.closeDrawer(drawer_content);
    }
 
    @Override
    public void setTitle(CharSequence title) {
        main_title = title;
        getActionBar().setTitle(main_title);
    }
 
    private class DrawerItemClickListener implements
            ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView parent, View view, int position,
                long id) {
            selectItem(position);
        }
    }
 
}