How to validate a spinner?

Question

Good afternoon. I’m making an Android application that has a form, and in this form there are spinners and response text fields. Someone can help me as I check if the spinner was selected?

Answer 1

It’s kind of manly, but it’s a solution that works well for me.

Add a blank item in the spinner, with a default text, example, "Select an option". Then treat the setOnItemSelectedListener event from the spinner and save the selected position. If different from the initial spinner, the user has selected something.

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                mSpinnerPos = position;
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });

If anyone has any tips to increase the solution and make it less manly I appreciate.

Answer 2

I ended up doing this manual way to solve, this way she already disconsidera the spinner null, it worked. If there is a better suggestion thank you.

boolean validaConfere = false;
if (spnConheceAbrigo.getSelectedItem().toString().equals("Sim")){
    if (listaAbrigoSolicitacao.size() == 0){
        validaConfere = false;
        imprimirAlertaAbrigos();
    }else {
        validaConfere = true;
    }
}
else if (spnConheceAbrigo.getSelectedItem().toString().equals("Não")){

    if (listaAbrigoSolicitacao.size() == 0){
        validaConfere = true;
    }else {
        listaAbrigoSolicitacao.clear();
        cbOcoArvore.setChecked(false);
        cbCaverna.setChecked(false);
        cbForroCasa.setChecked(false);
        cbTuneuTrem.setChecked(false);
        cbBueiro.setChecked(false);
        cbCasaVelha.setChecked(false);
        validaConfere = true;
    }
}

Answer 3

Hello,

So considering your Spinner will have a default value null, a simpler way to validate it would be like this:

String valor = null;

if(spinnerNome != null && spinnerNome.getSelectedItem() !=null ) {
   valor = (String) spinnerNome.getSelectedItem();
} else  { 
    //Spinner vazio
}

There are also more examples in this documentation of Android.