Question

我在android studio中的java新手。我不知道现在该做什么，我有一个微调器“亩”，我把物品放在“mu”与AarrayAdapter（makanan_pokok）里面，我的问题是我如何为旋转器内的每个物品赋予一个值并将其放入mapo？感谢...

package stmikbumigoramataram.simulasipemodelan;

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;

public class MainActivity extends AppCompatActivity {
    String[] makanan_pokok = {"...","Nasi Putih 175 kal/200gr","Lontong 38 kal/200gr","Roti Tawar 145 kal/60gr","Bubur 44 kal/200gr"};

    public int mapo,lapak,samur;

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


        Button tmblhitung = (Button)findViewById(R.id.bhitung);
        Spinner mu = (Spinner)findViewById(R.id.makanan_utama);


        ArrayAdapter Arr_mu = new ArrayAdapter(this,android.R.layout.simple_spinner_item,makanan_pokok);
        Arr_mu.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        mu.setAdapter(Arr_mu);

    }

    public void hitung_kalori(){
        switch (...){
case 1:     
mapo = 0;
case 2:
mapo = 175;
case 3:
mapo = 38;
case 4:
mapo = 145;
        }
    }

}

Answer 1

声明自定义类

  public class Item
  {
   String name;
   int value;
   public item(){}

   public item(String name,int value){

   this.name=name;
   this.value=value;
   }

  @override
  public String toString(){

     return name;
  }
}

现在更新现有代码

     Item[] makanan_pokok =new  Item[5];
     makanan_pokok[0]=new Item("",0);
     makanan_pokok[0]=new Item("Nasi Putih 175 kal/200gr",175);
     // ...rest of items...

然后创建适配器

    ArrayAdapter<Item> Arr_mu  = 
        new ArrayAdapter<Item>(this, android.R.layout.simple_list_item_1, 
        items);

    Arr_mu.setDropDownViewR
    esource(android.R.layout.simple_spinner_dropdown_item);
    mu.setAdapter(Arr_mu);

获取所选项目实现.listener

   AdapterView.OnItemSelectedListener

    //Performing action onItemSelected and onNothing selected
    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int position, 
    long id) {
    Toast.makeText(getApplicationContext(), animalList[position], 
    Toast.LENGTH_LONG).show();
     }

如何通过开关盒将旋转器内的每个物品放入价值？

1 个答案: