public class CategoriasActivity extends AppCompatActivity {

    private Categoria cat = new Categoria();
    FloatingActionButton formulario;
    private RecyclerView mRecyclerView;
    private CategoriasAdapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    private List<Categoria> categoriasList = new ArrayList<>();
    int id, position_elegida;
    private CategoriaPersist archivo_persist;

    int position;

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

        archivo_persist = new CategoriaPersist(CategoriasActivity.this);
        categoriasList = archivo_persist.instanceOf(CategoriasActivity.this).getCategorias();

        if(categoriasList.isEmpty()){

            Toast.makeText(CategoriasActivity.this, getString(R.string.empty_category), Toast.LENGTH_SHORT).show();
        }
        createDrawerItems();
        Toolbar tb = findViewById(R.id.toolbar2);
        tb.setTitle(R.string.categorias_title);

        formulario = findViewById(R.id.fab_categoria);

        formulario.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent intent = new Intent(CategoriasActivity.this, CategoriaForm.class);
                //Aquí debería de pasar el id para que se incremente y luego poder borrar o actualizar pero no me ha dado tiempo
                startActivity(intent);
            }


        });

        mRecyclerView = findViewById(R.id.cat_rv);
        mRecyclerView.setHasFixedSize(true);
        registerForContextMenu(mRecyclerView);


        //linear layout manager
        mLayoutManager = new GridLayoutManager(CategoriasActivity.this, 2);
        mRecyclerView.setLayoutManager(mLayoutManager);


        mAdapter = new CategoriasAdapter(categoriasList, this, new ClickListener() {
            @Override
            public void onItemClicked(int position) {


                id = categoriasList.get(position).getIdentificador();

                Intent intent = new Intent(CategoriasActivity.this, CategoriaForm.class);
                intent.putExtra("editar", true);
                intent.putExtra("id", id);
                startActivity(intent);

            }

            @Override
            public void onCreateContextMenu(ContextMenu menu, View v, int position) {
                MenuInflater inflater = new MenuInflater(CategoriasActivity.this);

                position_elegida = position;
                id = categoriasList.get(position).getIdentificador();

                inflater.inflate(R.menu.menu_clicks, menu);
            }

        });
        mRecyclerView.setAdapter(mAdapter);

    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {

        switch(item.getItemId()){

            case R.id.borrar_item:

            archivo_persist.delCategory(categoriasList.get(id));
            refreshFragment();
        }

        return super.onContextItemSelected(item);
    }

    @Override
    public void onResume() {
        super.onResume();
        refreshFragment();
    }

    public void refreshFragment(){

        categoriasList = CategoriaPersist.instanceOf(CategoriasActivity.this).getCategorias();
        mAdapter.contenido(categoriasList);
        mAdapter.notifyDataSetChanged();
    }

    public void createDrawerItems(){

        PrimaryDrawerItem item1 = new PrimaryDrawerItem().withIdentifier(1).withName(getString(R.string.drawer_ticket));
        PrimaryDrawerItem item2 = new PrimaryDrawerItem().withIdentifier(2).withName(getString(R.string.drawer_categoria));


        AccountHeader headerResult = new AccountHeaderBuilder()
                .withActivity(this)
                .withHeaderBackground(R.drawable.ic_launcher_background)
                .addProfiles(
                        new ProfileDrawerItem().withName("Tomas Neverdauskas").withEmail("tomas.neverdauskas@goumh.umh.es").withIcon(getResources().getDrawable(R.drawable.profile))
                )
                .build();

        Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar2);
        Drawer result = new DrawerBuilder()
                .withActivity(this)
                .withToolbar(toolbar)
                .addDrawerItems(item1, item2)
                .withAccountHeader(headerResult)
                .withOnDrawerItemClickListener(new Drawer.OnDrawerItemClickListener() {
                    @Override
                    public boolean onItemClick(View view, int position, IDrawerItem drawerItem) {

                        switch(position) {

                            case 1:

                                startActivity(new Intent(CategoriasActivity.this, TicketsTabbedActivity.class));

                            case 2:

                        }
                        return true;
                    }

                })
                .build();
        result.setSelection(2);
    }
}