本文实例讲述了Android中Spinner控件之键值对用法。分享给大家供大家参考。具体如下：
一、字典表，用来存放键值对信息
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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
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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
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<?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：
希望本文所述对大家的Android程序设计有所帮助。
