Question

我想将zone_id设置为spinner中的item以及来自json的区域名称

[{"zone_id":1,"zone_name":"North"},{"zone_id":2,"zone_name":"West"},{"zone_id":3,"zone_name":"South"},{"zone_id":4,"zone_name":"East"}]

我创建了一个自定义类

public class StringWithTag{
        public Object itemId;
        public String itemName;

        public StringWithTag(Object itemId,String itemName){
            this.itemId = itemId;
            this.itemName = itemName;
        }
    }

将项目添加到列表中

instituteArrayList.add(new StringWithTag(itemId,itemName));

但问题是在下拉列表中我得到了对象的引用

我希望区域显示在微调器中，当我点击任何区域时，应该获取相应的ID。

Answer 1

听起来您需要覆盖自定义对象上的toString()。对象引用来自toString()

定义的默认Object方法

public class StringWithTag{
    public Object itemId;
    public String itemName;

    public StringWithTag(Object itemId,String itemName){
        this.itemId = itemId;
        this.itemName = itemName;
    }

    @Override
    public void toString() {
        return this.itemName;
    }
}

Answer 2

为您的班级创建Setter和Getters

 public class StringWithTag {
        public String itemId;
        public String itemName;

        public StringWithTag(String itemId,String itemName){
            this.itemId = itemId;
            this.itemName = itemName;
        }

        public String getItemId() {
            return itemId;
        }

        public void setItemId(String itemId) {
            this.itemId = itemId;
        }

        public String getItemName() {
            return itemName;
        }

        public void setItemName(String itemName) {
            this.itemName = itemName;
        }
    }

并在您的微调器上应用侦听器

spinner.setOnItemClickListener(new AdapterView.OnItemClickListener()      
      {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            int id = instituteArrayList.get(position)getItemId();
            }
        });

在Spinner中将ID设置为Item

2 个答案: