Android中Spinner控件之键值对用法实例分析

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; }}

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) {   }  }); }}

<?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>