public class Home extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {
    CoordinatorLayout homeLayout;

    private GoogleApiClient client;
    private Toolbar toolbar;
    private TabLayout tabLayout;
    private ViewPager viewPager;
    private RevealLayout mRevealLayout;



    View mViewToReveal;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        homeLayout = (CoordinatorLayout) findViewById(R.id.CoordinatorLayout);
        setSupportActionBar(toolbar);

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

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        viewPager = (ViewPager) findViewById(R.id.viewpager);
        setupViewPager(viewPager);

        tabLayout = (TabLayout) findViewById(R.id.tabs);
        tabLayout.setupWithViewPager(viewPager);


        mViewToReveal = findViewById(R.id.reveal_view);
        mRevealLayout = (RevealLayout) findViewById(R.id.reveal_layout);
        final View mRevealView=(View)
                findViewById(R.id.reveal_view);

         final FloatingActionButton mFab = (FloatingActionButton) findViewById(R.id.fab);
        mFab.setOnClickListener(new View.OnClickListener() {



            @Override
            public void onClick(View v) {
                mFab.setClickable(false); // Avoid naughty guys clicking FAB again and again...
                int[] location = new int[2];
                mFab.getLocationOnScreen(location);
                location[0] += mFab.getWidth() / 2;
                location[1] += mFab.getHeight() / 2;

                final Intent intent = new Intent(Home.this, SearchActivity.class);

                mRevealView.setVisibility(View.VISIBLE);
                mRevealLayout.setVisibility(View.VISIBLE);

                mRevealLayout.show(location[0], location[1]); // Expand from center of FAB. Actually, it just plays reveal animation.
                mFab.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        startActivity(intent);
                        /**
                         * Without using R.anim.hold, the screen will flash because of transition
                         * of Activities.
                         */
                        overridePendingTransition(0, R.anim.hold);
                    }
                }, 200); // 600 is default duration of reveal animation in RevealLayout
                mFab.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        mFab.setClickable(true);
                        mRevealLayout.setVisibility(View.INVISIBLE);
                        mViewToReveal.setVisibility(View.INVISIBLE);
                    }
                }, 960); // Or some numbers larger than 600.
            }
        });


        client = new GoogleApiClient.Builder(Home.this).addApi(AppIndex.API).build();

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);



    }


    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_home, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        switch (item.getItemId()) {
            //noinspection SimplifiableIfStatement


            case R.id.action_notify:
                startActivity(new Intent(this, Home.class));
                return true;



            case R.id.action_checkbox1:
                if (item.isChecked()) item.setChecked(false);
                else item.setChecked(true);
                homeLayout.getResources().getColor(R.color.colorCheckbox);
                return true;

            case R.id.action_checkbox2:
                if (item.isChecked()) item.setChecked(false);
                else item.setChecked(true);
                homeLayout.getResources().getColor(R.color.colorCheckbox);
                return true;

            case action_checkbox3:
                if (item.isChecked()) item.setChecked(false);
                else item.setChecked(true);
                homeLayout.getResources().getColor(R.color.colorCheckbox);
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
        @SuppressWarnings("StatementWithEmptyBody")
        @Override
        public boolean onNavigationItemSelected (MenuItem item){
            // Handle navigation view item clicks here.
            int id = item.getItemId();

            if (id == R.id.nav_camera) {
                // Handle the camera action
            } else if (id == R.id.nav_gallery) {

            DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
            drawer.closeDrawer(GravityCompat.START);
            return true;


        }

    private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(new OneFragment(), "Breakfast");
        adapter.addFragment(new TwoFragment(), "Lunch");
        adapter.addFragment(new ThreeFragment(), "Merienda");
        viewPager.setAdapter(adapter);
    }

    class ViewPagerAdapter extends FragmentPagerAdapter {
        private final List<Fragment> mFragmentList = new ArrayList<>();
        private final List<String> mFragmentTitleList = new ArrayList<>();

        public ViewPagerAdapter(FragmentManager manager) {
            super(manager);
        }

        @Override
        public Fragment getItem(int position) {
            return mFragmentList.get(position);
        }

        @Override
        public int getCount() {
            return mFragmentList.size();
        }

        public void addFragment(Fragment fragment, String title) {
            mFragmentList.add(fragment);
            mFragmentTitleList.add(title);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mFragmentTitleList.get(position);
        }

    }

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:openDrawer="start">

    <com.example.jovie.canteen.RevealLayout
        android:id="@+id/reveal_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="invisible">

        <View
            android:id="@+id/reveal_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:visibility="invisible"/>

    </com.example.jovie.canteen.RevealLayout>

    <include
        layout="@layout/app_bar_home"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.NavigationView
        android:id="@+id/nav_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/nav_header_home"
        app:menu="@menu/activity_home_drawer"
        android:background="#ffffff" />