java baseadapter

public class MenuCategories extends AppCompatActivity {

    private ListView listCategories;
    private PostAdapter adapter;
    private String[] categorieslist;
    private ItemAdapter adapterlIST;

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

        listCategories = (ListView)findViewById(R.id.listView_categories);
        TextView texto =(TextView)findViewById(R.id.texto);

        categorieslist = new String[3];

        categorieslist = new String[3];
        categorieslist[0] = "category";
        categorieslist[1] = "category";
        categorieslist[2] = "category";



        texto.setText(categorieslist[0]+categorieslist[1]);

        //listCategories.setBackgroundColor(R.color.md_indigo_500);

        adapterlIST = new ItemAdapter(getApplicationContext(), categorieslist);

        listCategories.setAdapter(adapterlIST);

    }
}