MainActivity.java

package materialapp.survivingwithandroid.com.materialapp;

/*
 * Copyright (C) 2015, Francesco Azzola
 *
 *(http://www.survivingwithandroid.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * 20/10/15
 */


import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.RelativeLayout;

public class MainActivity extends AppCompatActivity {

    private RelativeLayout layout;
    private DrawerLayout dLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_nav);
        layout = (RelativeLayout) findViewById(R.id.layout);
        setNavigationDrawer();
        setToolBar();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.main_menu, menu);
        return true;
    }

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

        ActionBar ab = getSupportActionBar();
        ab.setHomeAsUpIndicator(R.drawable.ic_menu_white_24dp);
        ab.setDisplayHomeAsUpEnabled(true);
    }

    private void setNavigationDrawer() {
        dLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        NavigationView navView = (NavigationView) findViewById(R.id.navigation);
        navView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(MenuItem menuItem) {

                Fragment frag = null;
                int itemId = menuItem.getItemId();

                if (itemId == R.id.fab) {
                   frag = new Fragment1();
                }
                else if (itemId == R.id.star) {
                    frag = new Fragment2();
                }

                if (frag != null) {
                    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

                    transaction.replace(R.id.frame, frag);
                    transaction.commit();
                    dLayout.closeDrawers();
                    return true;
                }

                return false;
            }
        });
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int itemId = item.getItemId();
        String btnName = null;

        switch(itemId) {
            case R.id.menu_settings:
                btnName = "Settings";
                break;
            case R.id.menu_compass:
                btnName = "Compass";
                break;
            case R.id.menu_help:
                btnName = "Help";
                break;
            // Android home
            case android.R.id.home: {
                dLayout.openDrawer(GravityCompat.START);
                return true;
            }
        }

        Snackbar.make(layout, "Button " + btnName, Snackbar.LENGTH_SHORT).show();
        return true;
    }
}