Android[初级教程]第八章 ExpandableListView控件

这一章我们来学习ExpandableListView控件,ExpandableListView就是可扩展列表控件,还是拿西游记来说,里面唐僧师徙都各有各的本领,每个人的本领都不一样,放一起显示肯定不适合,这里我们就用ExpandableListView控件将他们显示出来.

看main.xml

<?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">
    <TextView android:text="西游记各主人公能力" android:id="@+id/textView1"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
    <ExpandableListView android:layout_height="wrap_content"
        android:id="@+id/expandableListView" android:layout_width="match_parent"></ExpandableListView>
    <TextView android:layout_height="wrap_content"
        android:layout_width="fill_parent" android:text="@string/hello"
        android:id="@+id/text"></TextView>
</LinearLayout>

还是跟前几次一样,定义了一个ExpandableListView控件,下面是java源代码:

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ButtonDemoActivity extends Activity
{
    private TextView text = null;
    private int[] image = { R.drawable.tangseng, R.drawable.wukong,
            R.drawable.bajie, R.drawable.shaseng };
    private String[] item = { "唐僧", "孙悟空 ", "猪八戒", "沙和尚" };
    private String[][] ability = { { "会念紧箍咒", "会说阿弥陀佛" },
            { "会七十二变", "会打妖精", "会腾云驾雾" }, { "会偷懒", "会睡觉" }, { "会挑担子" } };
    private ExpandableListView explandListView;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // 通过ID查找到main.xml中的TextView控件
        text = (TextView) findViewById(R.id.text);

        // 通过ID查找到main.xml中的ExpandableListView控件
        explandListView = (ExpandableListView) findViewById(R.id.expandableListView);

        //设置ExpandableListView适配器
        ExpandableListAdapter adapter = new BaseExpandableListAdapter()
        {

            //处理子项目的单击事件
            @Override
            public boolean isChildSelectable(int groupPosition,
                    int childPosition)
            {
                String str = item[groupPosition]
                        + ability[groupPosition][childPosition];
                updateText(str);
                return true;
            }

            @Override
            public boolean hasStableIds()
            {
                return true;
            }

            //返回父项目的视图控件
            @Override
            public View getGroupView(int groupPosition, boolean isExpanded,
                    View convertView, ViewGroup parent)
            {
                //新建一个线性布局
                LinearLayout ll = new LinearLayout(ButtonDemoActivity.this);
                // 设置布局样式为Horizontal
                ll.setOrientation(0);
                //设置布局左边距为50像素
                ll.setPadding(50, 0, 0, 0);
                //新建一个ImageView对象
                ImageView imageView = new ImageView(ButtonDemoActivity.this);
      &nb

补充：移动开发 , Android ,