I would like to know if in some way it is recommended to have an adapter for each Activity .

I know what to do with an Adapter for every Activity is quiet.

Now how to make a generic Adapter , would it?

Would you be following the design patterns?

My Activity

public class CardapioPizzaria extends Activity {

    ListView listViewCardapio;

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

        this.listViewCardapio = (ListView) findViewById(R.id.listCardapio);

        CardapioAdapter cardapioAdapter = new CardapioAdapter(this);
        this.listViewCardapio.setAdapter(cardapioAdapter);

    }
}

Adapter

public class CustomAdapter extends BaseAdapter {

    private Context context;

    @SuppressWarnings("unused")
    private static final String TAG = CustomAdapter.class.getSimpleName();
    ArrayList<DataModel> listArray;

    /*Construtor*/
    public CustomAdapter(Context context) {
        this.context = context;
        listArray = new ArrayList<DataModel>();
        listArray.add(new DataModel("Bom Filé","3214 - 2435")); 
        listArray.add(new DataModel("Porcão","3214 - 2435"));
        listArray.add(new DataModel("Palmarys","3214 - 2435")); 
        listArray.add(new DataModel("Fat Boy","3217 - 2452")); 
        listArray.add(new DataModel("Fratelli","3215 - 5010")); 
       listArray.add(new DataModel("Pizza Paulista","3214 - 3271")); 
        listArray.add(new DataModel("Fogão a Lenha","3215 - 5168")); 
       listArray.add(new DataModel("Alô Pizza","3214 - 4193")); 
    }

    /**Total de elementos dentro do array */
    public int getCount() {
        return listArray.size();
    }

    /**Pegando o item da lista */
    public Object getItem(int i) {
        return listArray.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int index, View view, final ViewGroup parent) {

        if (view == null) {
            LayoutInflater inflater = LayoutInflater.from(parent.getContext());
            view = inflater.inflate(R.layout.itens_lista, parent, false);
        }

        final DataModel dataModel = listArray.get(index);

        TextView textView = (TextView) view.findViewById(R.id.nome_estabelecimento);
        textView.setText(dataModel.getName());

        TextView textViewTelefone = (TextView) view.findViewById(R.id.numeroTelefone);
        textViewTelefone.setText("" + dataModel.getTelefone());

        Button buttonLigar = (Button) view.findViewById(R.id.btn_ligar_pizza);
        Button buttonVerCardapio = (Button) view.findViewById(R.id.btn_ver_cardapio_pizza);

        buttonLigar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Uri url = Uri.parse("tel: " + dataModel.getTelefone());
                Intent it = new Intent(Intent.ACTION_CALL,url);
                context.startActivity(it);    
            }
        });

        buttonVerCardapio.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent it = new Intent(context, CardapioPizzaria.class);
                context.startActivity(it);   
            }
        });

       return view;
    }
}

I did not put layouts because I did not see any need.