close Activities in Dialog

Question

The problem is a quiz app that’s ready, except for this problem.

the app has activities A(start game), B(questions), C(result). on A has a start button game that by clicking, goes to B. By clicking on the answer on B, it goes from B to C, and clicking on the button on C, back from C to B. And it goes from B to C and C to B to each answered question, accumulating several stacks.

what I want is that when I click exit on Activity A, close the app. But when I click to exit the game, it goes back to the pile of B piles.

i’ve used System.exit(0), finish()...

nothing worked.

Answer 1

When going from one screen to another, and do not intend to allow the user to return, use the finish(); after the startActivity(intent);.

Example:

Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
finish();

So when the user returns to the previous Activity it has already been completed, it will close the application. If the Activity remains in the stack.

I observed the following:

@Override
    public void onBackPressed() {
        Intent intent = new Intent(getApplicationContext(), PerguntasActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra("EXIT", true);
        startActivity(intent);
}

If this is the code of the Main screen, the onBackPressed() is overwriting the default method of the back button that is to end, and is sending to Questionsactivity.class

The second excerpt onResume() is called when the Activity is opened again, if you are calling it in the Questionasactivity it will finalize the Questionasactivity and return to the Main that remains in the stack. I think it’s not a mistake but a logic problem, but without the rest of the structure of your code it’s a little hard to give you the right answer.

Try it this way:

private void ChecarExit(){
        dialog = new AlertDialog.Builder(MainActivity.this);
        dialog.setTitle("CUIDADO!");
        dialog.setMessage("Deseja realmente sair do app?");
        dialog.setNegativeButton("Não", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                Toast.makeText(MainActivity.this, "Requisição cancelada", Toast.LENGTH_LONG).show();
            }
        });
        dialog.setPositiveButton("Sim", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {

                Intent intent = new Intent(getApplicationContext(), PerguntasActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                intent.putExtra("EXIT", true);
                startActivity(intent);

            }
        });

        dialog.create();
        dialog.show();
    }

Or you can declare a Boolean and manipulate the value of it during this page transition, then perform a check, more or less like this:

@Override
    public void onBackPressed() {
     if (isTrue()) {
        Intent intent = new Intent(getApplicationContext(), PerguntasActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra("EXIT", true);
        startActivity(intent);
     } else {
        finish();
     }
}

(In my personal opinion this would be an unnecessary gambit, the best would be to follow as I showed in the previous code)