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。