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Accepted
Angel Montes de Oca
Asked: 2020-01-03 20:01:19 +0800 CST 2020-01-03 20:01:19 +0800 CST

Spinner with steps (values) from 0.5 to 0.5?

  • 772

I need values ​​that go like this: 

0.5   
1  
1.5  
2  
2.5  
3  
Etc

I made a function but I don't know if it can be done in another way that requires less code, here is my code:

private String GetNumber(int spinner) {
        String result = "0";
        if (spinner == 1) {
            result = "0.5";
        }
        if (spinner == 2) {
            result = "1";
        }
        if (spinner == 3) {
            result = "1.5";
        }
        if (spinner == 4) {
            result = "2";
        }
        if (spinner == 5) {
            result = "2.5";
        }
        if (spinner == 6) {
            result = "3";
        }
        if (spinner == 7) {
            result = "3.5";
        }
        if (spinner == 8) {
            result = "4";
        }
        if (spinner == 9) {
            result = "4.5";
        }
        if (spinner == 10) {
            result = "5";
        }
        if (spinner == 11) {
            result = "5.5";
        }
        if (spinner == 12) {
            result = "6";
        }
        if (spinner == 13) {
            result = "6.5";
        }
        if (spinner == 14) {
            result = "7";
        }
        if (spinner == 15) {
            result = "7.5";
        }
        if (spinner == 16) {
            result = "8";
        }
        if (spinner == 17) {
            result = "8.5";
        }
        if (spinner == 18) {
            result = "9";
        }
        if (spinner == 19) {
            result = "9.5";
        }
        if (spinner == 20) {
            result = "10";
        }

        return result;

    }

Is it the correct way or is there an easier way?

java

3 Answers

  1. Best Answer

    It could simplify the function that returns half of the parameter, but within it it would be validated if it is an even integer num%2==0, if so, the result would be an integer. otherwise the division by 2.0is the most important part that will convert the result into a floatif necessary.

    public String GetNumber(int spinner){
    if(spinner%2==0) return String.valueOf(spinner/2);
    else return String.valueOf(spinner/2.0);
}

    In case you want to fill the Spinnerwith elements starting with 0.5, it would suffice to add a simple type to start and increment with said value, the function will have the limit value of the elements as a parameter.0.50.5fordouble

    public class MainActivity extends AppCompatActivity {
    List<String> spinnerArray;//Elementos del Spinner
    Spinner mispinner ; // Spinner en el Layout
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //Instanciamos el Array
        spinnerArray =  new ArrayList<String>();

        fillSpinnerValues(10);//LLamamos a la función con valor máximo 10
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                this, android.R.layout.simple_spinner_item, spinnerArray);
        mispinner= (Spinner) findViewById(R.id.mispinner);
        mispinner.setAdapter(adapter);
    }

    public void fillSpinnerValues(int limite){
        for (double  i= 0.5   ; i<= limite ; i+=0.5){
            //Comprobamos si es int el valor .Si es así realizamos el cast a int
            // Para no mostrar 1.0  o 2.0  si desea mostrar así simplemente
            // deja la linea spinnerArray.add(String.valueOf(i));
            if(i==Math.ceil(i)) spinnerArray.add(String.valueOf((int)i));
            else spinnerArray.add(String.valueOf(i));
        }
    }
}
    • 3

  2. The only thing I can think of is to use a switch:

    private String GetNumber(int spinner) {
    String result = "0";
    switch(spinner){
    case 1:
        result = "0.5";
        break;
    case 2:
        result = "1"; 
        break;
   //Sigue hasta 20
    • 1

  3. The sequence returns half of the number that is entered.

        public int calcular(int spinner) {
      var res = spinner/2;
      System.out.println(res);
      return res;
    }

    calcular(1);
    calcular(2);
    calcular(3);
    calcular(4);
    calcular(5);
    calcular(6);
    calcular(7);
    calcular(8);
    calcular(9);
    calcular(10);
    • 0