ExampleActivity.java

package com.example.activity;

import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;

import com.example.R;
import com.example.fragment.ExampleFragment;


public class ExampleActivity extends AppCompatActivity
{
	private DrawerLayout mDrawerLayout;
	private NavigationView mNavigationView;
	private ActionBarDrawerToggle mDrawerToggle;


	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_example);
		setupActionBar();
		setupDrawer(savedInstanceState);
		bindData();
	}


	@Override
	public boolean onOptionsItemSelected(MenuItem item)
	{
		// open or close the drawer if home button is pressed
		if(mDrawerToggle.onOptionsItemSelected(item))
		{
			return true;
		}

		// action bar menu behavior
		switch(item.getItemId())
		{
			case android.R.id.home:
				// TODO
				return true;

			default:
				return super.onOptionsItemSelected(item);
		}
	}


	@Override
	protected void onPostCreate(Bundle savedInstanceState)
	{
		super.onPostCreate(savedInstanceState);
		mDrawerToggle.syncState();
	}


	@Override
	public void onConfigurationChanged(Configuration newConfiguration)
	{
		super.onConfigurationChanged(newConfiguration);
		mDrawerToggle.onConfigurationChanged(newConfiguration);
	}


	@Override
	public void onBackPressed()
	{
		if(mDrawerLayout.isDrawerOpen(Gravity.LEFT))
		{
			mDrawerLayout.closeDrawer(Gravity.LEFT);
		}
		else
		{
			super.onBackPressed();
		}
	}


	private void setupActionBar()
	{
		Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
		setSupportActionBar(toolbar);

		ActionBar bar = getSupportActionBar();
		bar.setDisplayUseLogoEnabled(false);
		bar.setDisplayShowTitleEnabled(true);
		bar.setDisplayShowHomeEnabled(true);
		bar.setDisplayHomeAsUpEnabled(true);
		bar.setHomeButtonEnabled(true);
	}


	private void setupDrawer(Bundle savedInstanceState)
	{
		// reference
		mDrawerLayout = (DrawerLayout) findViewById(R.id.activity_example_drawer_layout);
		mNavigationView = (NavigationView) findViewById(R.id.activity_example_drawer_navigation);

		// navigation
		mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener()
		{
			@Override
			public boolean onNavigationItemSelected(MenuItem item)
			{
				selectDrawerItem(item);
				return true;
			}
		});

		// toggle
		mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.drawer_open, R.string.drawer_close)
		{
			@Override
			public void onDrawerClosed(View view)
			{
				supportInvalidateOptionsMenu();
			}


			@Override
			public void onDrawerOpened(View drawerView)
			{
				supportInvalidateOptionsMenu();
			}
		};
		mDrawerLayout.setDrawerListener(mDrawerToggle);

		// show initial fragment
		if(savedInstanceState == null)
		{
			MenuItem item = mNavigationView.getMenu().findItem(R.id.menu_navigation_example1);
			selectDrawerItem(item);
		}
	}


	private void selectDrawerItem(MenuItem item)
	{
		Fragment fragment = null;
		Intent intent = null;

		switch(item.getItemId())
		{
			case R.id.menu_navigation_example1:
			case R.id.menu_navigation_example2:
			case R.id.menu_navigation_example3:
				fragment = ExampleFragment.newInstance();
				break;

			case R.id.menu_navigation_example4:
			case R.id.menu_navigation_example5:
			case R.id.menu_navigation_example6:
			case R.id.menu_navigation_example7:
				intent = ExampleActivity.newIntent(this);
				break;
		}

		if(fragment != null)
		{
			FragmentManager fragmentManager = getSupportFragmentManager();
			fragmentManager.beginTransaction().replace(R.id.container_drawer_content, fragment).commitAllowingStateLoss();

			item.setChecked(true);
			getSupportActionBar().setTitle(item.getTitle());
		}

		if(intent != null)
		{
			startActivity(intent);
		}

		mDrawerLayout.closeDrawers();
	}


	private void bindData()
	{
		// reference
		TextView titleTextView = (TextView) mNavigationView.getHeaderView(0).findViewById(R.id.navigation_header_title);

		// title
		titleTextView.setText("Hello world");
	}
}