MainActivity.java

package okason.com.attendanceapp.Activities;

import android.content.Intent;
import android.support.v4.app.Fragment;
import android.support.v4.widget.DrawerLayout;
import android.os.Bundle;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.GestureDetector;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

import okason.com.attendanceapp.Adapters.NavDrawerAdapter;
import okason.com.attendanceapp.Fragments.AttendantsList;
import okason.com.attendanceapp.Fragments.EventListFragment;
import okason.com.attendanceapp.Fragments.RegistrationFragment;
import okason.com.attendanceapp.Models.DrawerItem;
import okason.com.attendanceapp.R;


public class MainActivity extends AppCompatActivity {
    private Toolbar mToolbar;

    public String HEADER_NAME = "Val Okafor";
    public String HEADER_EMAIL = "[email protected]";
    public int HEADER_IMAGE = R.drawable.val_okafor;

    private final static int ATTENDANTS_FRAGMENT = 1;
    private final static int EVENTS_FRAGMENT = 2;
    private final static int REGISTRATION_FRAGMENT = 3;
    private final static int SETTINGS_FRAGMENT = 4;


    private RecyclerView mRecyclerView;
    private RecyclerView.LayoutManager mLayoutManager;
    private DrawerLayout Drawer;
    private ActionBarDrawerToggle mDrawerToggle;
    private List<DrawerItem> dataList;
    private RecyclerView.Adapter mAdapter;

    private int currentFragment = 1;



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

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

        mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView);
        mRecyclerView.setHasFixedSize(true);

        dataList = new ArrayList<DrawerItem>();
        addItemsToDataList();

        mAdapter = new NavDrawerAdapter(dataList, this, HEADER_NAME, HEADER_EMAIL, HEADER_IMAGE);

        mRecyclerView.setAdapter(mAdapter);

        final GestureDetector mGestureDetector =
                new GestureDetector(MainActivity.this, new GestureDetector.SimpleOnGestureListener() {
                    @Override
                    public boolean onSingleTapUp(MotionEvent e) {
                        return true;
                    }
                });

        mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
            @Override
            public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
                View child = recyclerView.findChildViewUnder(motionEvent.getX(),motionEvent.getY());

                if (child != null && mGestureDetector.onTouchEvent(motionEvent)){
                    Drawer.closeDrawers();
                    onTouchDrawer(recyclerView.getChildLayoutPosition(child));
                    return true;
                }
                return false;
            }

            @Override
            public void onTouchEvent(RecyclerView rv, MotionEvent e) {

            }
        });

        mLayoutManager = new LinearLayoutManager(this);
        mRecyclerView.setLayoutManager(mLayoutManager);
        Drawer = (DrawerLayout) findViewById(R.id.DrawerLayout);
        mDrawerToggle = new ActionBarDrawerToggle(this, Drawer, mToolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close) {
            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
            }

            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
            }
        };
        Drawer.setDrawerListener(mDrawerToggle);
        mDrawerToggle.syncState();
        onTouchDrawer(currentFragment);

    }

    @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_main, 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.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private void makeToast(String message){
        Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
    }

    public void openFragment(final Fragment fragment) {
        getSupportFragmentManager()
                .beginTransaction()
                .replace(R.id.container, fragment)
                .commit();
    }

    private void onTouchDrawer(final int position) {
        //  if (currentFragment == position) return;
        currentFragment = position;

        switch (position) {
            case ATTENDANTS_FRAGMENT:
                openFragment(new AttendantsList());
                break;
            case REGISTRATION_FRAGMENT:
                openFragment(new RegistrationFragment());
                break;
            case EVENTS_FRAGMENT:
                openFragment(new EventListFragment());
                break;
            case SETTINGS_FRAGMENT:
                startActivity(new Intent(this, PreferenceActivity.class));
            default:
                return;
        }
    }





    private void addItemsToDataList(){
        dataList.add(new DrawerItem(getString(R.string.title_attendants), R.drawable.ic_action_attendants_list));
        dataList.add(new DrawerItem(getString(R.string.title_events), R.drawable.ic_action_events_list));
        dataList.add(new DrawerItem(getString(R.string.title_registration), R.drawable.ic_action_registration));
//        dataList.add(new DrawerItem(getString(R.string.title_reports), R.drawable.ic_action_report));
        dataList.add(new DrawerItem(getString(R.string.title_settings), R.drawable.ic_action_settings));
    }
}

Thanks a lot for your tutorial