Why the app does not leave the white screen and does not give errors?

I'm making a pretty basic app with a screen that simulates a bingo card.

The problem is that when I run the code, without checking for repeated numbers (because there are no repeated numbers in a bingo card), the program runs quietly:

public class MainActivity extends AppCompatActivity {

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

        Random nRand = new Random();
        ArrayList<View> btn;
        int[] sorteados = new int[25];
        View cartela = findViewById(R.id.CartelaMain); //CartelaMain é o layout principal onde estão os 25 botões e um TextView
        btn = cartela.getTouchables();

        for(int cont = 0;cont < btn.size();cont++){
            int numero = nRand.nextInt(99) + 1; //Definindo o numero randômico
            Button botao = (Button) btn.get(contA); //Instanciando o botão
            String txt1 = Integer.toString(numero); //Passando de int para String
            botao.setText(txt1); //Set texto do botao
        }
    }

Now when I apply the verification:

public class MainActivity extends AppCompatActivity {

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

        Random nRand = new Random();
        ArrayList<View> btn;
        int[] sorteados = new int[25];
        View cartela = findViewById(R.id.CartelaMain); //CartelaMain é o layout principal onde estão os 25 botões e um TextView
        btn = cartela.getTouchables();

        for (int contA = 0; contA < btn.size(); contA++) { //Este método gera os numeros randomicametne e verifica por repetição dos numeros sorteados 
            int numero = nRand.nextInt(99) + 1;
            Boolean continuar = true;
            do {
                Boolean sair = true;
                for (int contB = 0; contB < btn.size(); contB++) {
                    int aux = sorteados[contB];
                    if(aux == numero){
                        numero = nRand.nextInt(99) + 1;
                        continuar = !sair;
                        contB = contB - 1;
                    }
               }

            } while (!continuar) ;

            sorteados[contA] = numero; //Armazenamento do numero no Array
            Button botao = (Button) btn.get(contA); //Instanciando o botão
            String txt1 = Integer.toString(numero); //Passando de int para String
            botao.setText(txt1); //Set texto do botão

        }

    }

The app simply does not leave the white screen. There is no record of compile errors by Android Studio and I have also debugged about 4 times.

I found the solution to the above situation, there was an infinite loop loop:

int number = nRand.nextInt (99) + 1;             Boolean continue = true;             of {                 Boolean exit = true;                 for (int contB = 0; contB When declared this way, the loop created for verification was not effective. Ex:

for (cont = 0; contd