三十四、Android(安卓)Spinner控件之键值对用法

一、字典表，用来存放键值对信息

package com.ljq.activity;

import java.io.Serializable;

@SuppressWarnings("serial")
public class Dict implements Serializable {
    private Integer id;
    private String text;

    public Dict() {
    }

    public Dict(Integer id, String text) {
        super();
        this.id = id;
        this.text = text;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    /**
     * 为什么要重写toString()呢？
     * 
     * 因为适配器在显示数据的时候，如果传入适配器的对象不是字符串的情况下，直接就使用对象.toString()
     */
    @Override
    public String toString() {
        return text;
    }

}

二、activity类，绑定数据、获取选中的键值对

package com.ljq.activity;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;

public class MainActivity extends Activity {
    private Spinner mySpinner;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mySpinner = (Spinner) findViewById(R.id.mySpinner);
        List<Dict> dicts = new ArrayList<Dict>();
        dicts.add(new Dict(1, "测试1"));
        dicts.add(new Dict(2, "测试2"));
        dicts.add(new Dict(3, "测试3"));
        dicts.add(new Dict(4, "测试4"));
        ArrayAdapter<Dict> adapter = new ArrayAdapter<Dict>(this,
                android.R.layout.simple_spinner_item, dicts);
        mySpinner.setAdapter(adapter);
        mySpinner.setOnItemSelectedListener(new OnItemSelectedListener(){
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                // 获取键的方法：mySpinner.getSelectedItem().toString()或((Dict)mySpinner.getSelectedItem()).getId()
                // 获取值的方法：((Dict)mySpinner.getSelectedItem()).getText();
                Toast.makeText(MainActivity.this,
                        "键:" + mySpinner.getSelectedItem().toString() + "、" + ((Dict) mySpinner.getSelectedItem()).getId() + 
                        "，值:" + ((Dict) mySpinner.getSelectedItem()).getText(),
                        Toast.LENGTH_LONG).show();
            }

            public void onNothingSelected(AdapterView<?> parent) {
                
            }
        });
    }
}

三、修改main.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <Spinner android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/mySpinner"/>
</LinearLayout>

四、运行结果如下：

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