Android 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：

Android Spinner控件之键值对用法

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