ListView下拉列表控件

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ListView列表控件
列表的显示需要三个元素：
view 用来显示数据的view
适配器用来把数据映射到view的中介
数据具体的将被映射的字符串，图片，或者基本组件

这里写图片描述

案例代码
布局文件代码

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"     >    <ListView         android:id="@+id/lv_list"     android:layout_width="match_parent"     android:layout_height="match_parent"        /></LinearLayout>

activity代码

package rr.yy;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.Toast;public class ListViewDemo extends Activity {   private ListView lv_list;    @Override     public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        lv_list=(ListView)findViewById(R.id.lv_list);        final ArrayAdapter<String> adapter=new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1,getData());        lv_list.setAdapter(adapter);        lv_list.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,                    long arg3) {                // TODO Auto-generated method stub                String txt =adapter.getItem(arg2);                Toast.makeText(ListViewDemo.this, txt, 0).show();            }        });    }       private String[] getData() {        // TODO Auto-generated method stub        return new String[]{"lin","kin","park","好好","先生","上学","但是","得分","武器","读书","克扣","奋斗"};    }}

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