I need to know how I use a .text as a database; I just need it to show the data it contains

Come on! I'll show you how to load a .txt from the Assets folder:
create a file named dados.txt inside the assets folder It will have the following structure:

item 1;descrição um;image1.png
item 2;descrição dois;image2.png

To load this file use the following code:

 /**
 * Carrega um arquivo txt e transforma as linhas em Objeto.
 */
private void load(){
      try {
         final InputStream inputStream = getAssets().open("dados.txt");
         final InputStreamReader inputreader = new InputStreamReader(inputStream); 
            BufferedReader buffreader = new BufferedReader(inputreader); 
            final List<Item> itens = new ArrayList<MainActivity.Item>(0);
            String line = "";
                while ((line = buffreader.readLine()) != null){
                    String[] values = line.split(";");
                    final Item item = new Item(values[0], values[1], values[2]);
                    itens.add(item);
                }

    } catch (IOException e) {
        e.printStackTrace();
    }
 }

 /** 
 * Representa o objeto que será exibido
 */
public static class Item {
     public Item(final String title, final String description, final String image) {
         this.title = title;
         this.description = description;
         this.image = image;
    }
     public String title;
     public String description;
     public String image;
 }

I hope I have helped! Greetings!