MainActivity Resistor

package info.rekayasa.resistor;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    Spinner spinner1, spinner2, spinner3;
    Button btnHitung;
    TextView tvHasil;

    int nilai1, nilai2, nilai3;

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

        spinner1 = (Spinner) findViewById(R.id.spinner);
        spinner2 = (Spinner) findViewById(R.id.spinner2);
        spinner3 = (Spinner) findViewById(R.id.spinner3);

        setData();

        tvHasil = (TextView) findViewById(R.id.tvHasil);
        btnHitung = (Button) findViewById(R.id.btnHitung);

        spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                Gelang1 gelang1 = (Gelang1) adapterView.getSelectedItem();
                nilai1 = gelang1.getNilai();
            }

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

            }
        });

        spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                Gelang2 gelang2 = (Gelang2) adapterView.getSelectedItem();
                nilai2 = gelang2.getNilai();
            }

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

            }
        });

        spinner3.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                Gelang3 gelang3 = (Gelang3) adapterView.getSelectedItem();
                nilai3 = gelang3.getNilai();
            }

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

            }
        });

        btnHitung.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                System.out.println("Nilai 1, 2, 3: " + nilai1 + ", " + nilai2 + ", " + nilai3);
                String nilai12 = String.valueOf(nilai1) + String.valueOf(nilai2);
                int iNilai12 = Integer.parseInt(nilai12);
                int hasil = iNilai12 * nilai3;
                tvHasil.setText("Hambatan: " + String.valueOf(hasil) + " Ohm");
            }
        });
    }

    private void setData(){
        ArrayList<Gelang1> gelangList1 = new ArrayList<>();
        ArrayList<Gelang2> gelangList2 = new ArrayList<>();
        ArrayList<Gelang3> gelangList3 = new ArrayList<>();

        gelangList1.add(new Gelang1("Hitam", 0));
        gelangList1.add(new Gelang1("Coklat", 1));
        gelangList1.add(new Gelang1("Merah", 2));
        gelangList1.add(new Gelang1("Jingga", 3));
        gelangList1.add(new Gelang1("Kuning", 4));
        gelangList1.add(new Gelang1("Hijau", 5));
        gelangList1.add(new Gelang1("Biru", 6));
        gelangList1.add(new Gelang1("Ungu", 7));
        gelangList1.add(new Gelang1("Abu", 8));
        gelangList1.add(new Gelang1("Putih", 9));

        gelangList2.add(new Gelang2("Hitam", 0));
        gelangList2.add(new Gelang2("Coklat", 1));
        gelangList2.add(new Gelang2("Merah", 2));
        gelangList2.add(new Gelang2("Jingga", 3));
        gelangList2.add(new Gelang2("Kuning", 4));
        gelangList2.add(new Gelang2("Hijau", 5));
        gelangList2.add(new Gelang2("Biru", 6));
        gelangList2.add(new Gelang2("Ungu", 7));
        gelangList2.add(new Gelang2("Abu", 8));
        gelangList2.add(new Gelang2("Putih", 9));

        gelangList3.add(new Gelang3("Hitam", 1));
        gelangList3.add(new Gelang3("Coklat", 10));
        gelangList3.add(new Gelang3("Merah", 100));
        gelangList3.add(new Gelang3("Jingga", 1000));
        gelangList3.add(new Gelang3("Kuning", 10000));
        gelangList3.add(new Gelang3("Hijau", 100000));
        gelangList3.add(new Gelang3("Biru", 1000000));
        gelangList3.add(new Gelang3("Ungu", 10000000));
        gelangList3.add(new Gelang3("Abu", 100000000));
        gelangList3.add(new Gelang3("Putih", 1000000000));

        ArrayAdapter<Gelang1> adapter = new ArrayAdapter<Gelang1>(this,
                android.R.layout.simple_spinner_dropdown_item, gelangList1);
        spinner1.setAdapter(adapter);

        ArrayAdapter<Gelang2> adapter2 = new ArrayAdapter<Gelang2>(this,
                android.R.layout.simple_spinner_dropdown_item, gelangList2);
        spinner2.setAdapter(adapter2);

        ArrayAdapter<Gelang3> adapter3 = new ArrayAdapter<Gelang3>(this,
                android.R.layout.simple_spinner_dropdown_item, gelangList3);
        spinner3.setAdapter(adapter3);
    }
}