Android App - EWC

package com.repjesus.ewc;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
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.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

import java.util.List;

public class ShoppingCategoryImage extends AppCompatActivity {

    private View parent_view;
    private ActionBar actionBar;
    private BottomNavigationView navigation;
    private Toolbar toolbar;
    private RecyclerView recyclerView;
    private AdapterListShopCategoryImg mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_shopping_category_image);
        parent_view = findViewById(R.id.parent_view);

        initToolbar();
        initComponent();
        initNavigationMenu();
    }

    private void initToolbar() {
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
        actionBar.setHomeButtonEnabled(true);
        actionBar.setTitle("EWC App");
        // Tools.setSystemBarColor(this);
    }

    private void initComponent() {
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setHasFixedSize(true);
        recyclerView.setNestedScrollingEnabled(false);

        List<ShopCategory> items = DataGenerator.getShoppingCategory(this);

        //set data and list adapter
        mAdapter = new AdapterListShopCategoryImg(this, items);
        recyclerView.setAdapter(mAdapter);

        // on item list clicked
        mAdapter.setOnItemClickListener(new AdapterListShopCategoryImg.OnItemClickListener() {
            @Override
            public void onItemClick(View view, ShopCategory obj, int position) {
                Snackbar.make(parent_view, "Item " + obj.title + " clicked", Snackbar.LENGTH_SHORT).show();
            }
        });

        navigation = (BottomNavigationView) findViewById(R.id.navigation);
        navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()) {
                    case R.id.navigation_recent:
                        actionBar.setTitle(item.getTitle());
                        Toast.makeText(getApplicationContext(), item.getTitle() + " Selected", Toast.LENGTH_SHORT).show();
                        return true;
                    case R.id.navigation_favorites:
                        actionBar.setTitle(item.getTitle());
                        Toast.makeText(getApplicationContext(), item.getTitle() + " Selected", Toast.LENGTH_SHORT).show();
                        return true;
                    case R.id.navigation_nearby:
                        actionBar.setTitle(item.getTitle());
                        Toast.makeText(getApplicationContext(), item.getTitle() + " Selected", Toast.LENGTH_SHORT).show();
                        return true;
                }
                return false;
            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_search_setting, menu);
        return true;
    }

    private void initNavigationMenu() {
        NavigationView nav_view = (NavigationView) findViewById(R.id.nav_view);
        final 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) {
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
            }
        };
        drawer.setDrawerListener(toggle);
        toggle.syncState();
        nav_view.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(final MenuItem item) {

                switch (item.getItemId()) {
                    case R.id.nav_starred:
                        actionBar.setTitle(item.getTitle());
                        Toast.makeText(getApplicationContext(), item.getTitle() + " Selected", Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.nav_sent:
                        actionBar.setTitle(item.getTitle());
                        Toast.makeText(getApplicationContext(), item.getTitle() + " Selected", Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.nav_spam:
                        actionBar.setTitle(item.getTitle());
                        Toast.makeText(getApplicationContext(), item.getTitle() + " Selected", Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.nav_connect:
                        actionBar.setTitle(item.getTitle());
                        Toast.makeText(getApplicationContext(), item.getTitle() + " Selected", Toast.LENGTH_SHORT).show();
                        break;
                    case R.id.nav_setting:
                        actionBar.setTitle(item.getTitle());
                        Toast.makeText(getApplicationContext(), item.getTitle() + " Selected", Toast.LENGTH_SHORT).show();
                        break;
                }

                drawer.closeDrawers();
                return true;
            }
        });

        // open drawer at start
        // drawer.openDrawer(GravityCompat.START);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            finish();
        } else {
            Toast.makeText(getApplicationContext(), item.getTitle(), Toast.LENGTH_SHORT).show();
        }
        return super.onOptionsItemSelected(item);
    }
}