Validate form

I'm developing a mobile application in android studio and I'm having a hard time implementing validation of the form's input fields.

Can anyone explain why I can not validate?

Form Class:

public class FormPalhetasActivity extends Activity implements 
AdapterView.OnItemSelectedListener, LocationListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate( savedInstanceState );

    setContentView( R.layout.activity_form_palhetas );
    frua = (EditText) findViewById(R.id.rua);
    fbairro = (EditText) findViewById(R.id.bairro);
    fcompl = (EditText) findViewById(R.id.compl);
    fcidade = (EditText) findViewById(R.id.cidade);
    festado = (EditText) findViewById(R.id.estado);
    fpais = (EditText) findViewById(R.id.pais);
    fobs = (EditText) findViewById(R.id.observacao);
    fcod = (EditText) findViewById(R.id.cod);

    // Spinner element
    Spinner spinner = (Spinner) findViewById(R.id.spinner);

    // Spinner click listener
    spinner.setOnItemSelectedListener(this);

    // Spinner Drop down elements
    List<String> categories = new ArrayList<String>();
    categories.add("Terreno baldio");
    categories.add("Esgoto a ceu aberto");
    categories.add("Lixo");
    categories.add("Piscina");
    categories.add("Construção");

    // Creating adapter for spinner
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);

    // Drop down layout style - list view with radio button
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    // attaching data adapter to spinner
    spinner.setAdapter(dataAdapter);

    readMyCurrentCoordinates();
    Button enviar = (Button) findViewById( R.id.enviar );


    enviar.setOnClickListener( new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if(valid() == true){
                registerForms();
            }

        }
    } );
}

public static boolean validateNotNull(View pView, String pMessage) {
    if (pView instanceof EditText) {
        EditText edText = (EditText) pView;
        Editable text = edText.getText();
        if (text != null) {
            String strText = text.toString();
            if (!TextUtils.isEmpty(strText)) {
                return true;
            }
        }
        // em qualquer outra condição é gerado um erro
        edText.setError(pMessage);
        edText.setFocusable(true);
        edText.requestFocus();
        return false;
    }
    return false;
}

public boolean valid(){
    if(validateNotNull(frua,"Preencha o campo rua")) {
        return false;
    }if(validateNotNull(fcompl,"Preencha o campo complemento")) {
        return false;
    }if(validateNotNull(fbairro,"Preencha o campo bairro")) {
        return false;
    }if(validateNotNull(fcidade,"Preencha o campo cidade")) {
        return false;
    }if(validateNotNull(festado,"Preencha o campo estado")) {
        return false;
    }if(validateNotNull(fobs,"Preencha o campo observação")) {
        return false;
    }if(validateNotNull(fpais,"Preencha o campo país")) {
        return false;
    }if(validateNotNull(fpais,"Preencha o campo país")) {
        return false;
    }else{
        return true;
    }
}

Output: No notification appears that the field is blank.