Android用户界面UI组件--AdapterView及其子类(三) ExpandableListView

ExpandableListView: List中的每一项可以展开收缩. 一种伸缩式的ListView.

android:cacheColorHint="#00000000"

这个设置可以去除拖动view时背景变成黑色的效果
android:listSelector="#00000000" 

可以去除选中时的黄色底色

使用SimpleExpandableListAdapter显示ExpandableListView
public SimpleExpandableListAdapter (Context context, List<? extends Map<String, ?>> groupData, int groupLayout, String[] groupFrom, int[] groupTo, List<? extends List<? extends Map<String, ?>>> childData, int childLayout, String[] childFrom, int[] childTo) 
 * 参数1.上下文对象Context
 * 参数2.一级条目目录集合
 * 参数3.一级条目对应的布局文件
 * 参数4.fromto，就是map中的key，指定要显示的对象
 * 参数5.与参数4对应，指定要显示在groups中的id
 * 参数6.二级条目目录集合
 * 参数7.二级条目对应的布局文件
 * 参数8.fromto，就是map中的key，指定要显示的对象
 * 参数9.与参数8对应，指定要显示在childs中的id

例子:

<?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"
    android:orientation="vertical" >
	<ExpandableListView 
	    android:id="@+id/list"
	    android:layout_width="fill_parent"
	    android:layout_height="fill_parent"
	    android:background="#ffffff"
	    android:cacheColorHint="#00000000"
	    android:listSelector="#00000000" 
	    >
	    
	</ExpandableListView>

</LinearLayout>

package com.light.android.study;

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

public class MainActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);

		final ExpandableListAdapter adapter = new BaseExpandableListAdapter() {
			//设置组视图的图片
			private int[] logos = new int[] { R.drawable.wei, R.drawable.shu,R.drawable.wu};
			//设置组视图的显示文字
			private String[] generalsTypes = new String[] { "魏", "蜀", "吴" };
			//子视图显示文字
			private String[][] generals = new String[][] {
					{ "夏侯惇", "甄姬", "许褚", "郭嘉", "司马懿", "杨修" },
					{ "马超", "张飞", "刘备", "诸葛亮", "黄月英", "赵云" },
					{ "吕蒙", "陆逊", "孙权", "周瑜", "孙尚香" }

			};
			//子视图图片
			public int[][] generallogos = new int[][] {
					{ R.drawable.xiahoudun, R.drawable.zhenji,
							R.drawable.xuchu, R.drawable.guojia,
							R.drawable.simayi, R.drawable.yangxiu },
					{ R.drawable.machao, R.drawable.zhangfei,
							R.drawable.liubei, R.drawable.zhugeliang,
							R.drawable.huangyueying, R.drawable.zhaoyun },
					{ R.drawable.lvmeng, R.drawable.luxun, R.drawable.sunquan,
							R.drawable.zhouyu, R.drawable.sunshangxiang } };
			
			//自己定义一个获得文字信息的方法
			TextView getTextView() {
				AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
						ViewGroup.LayoutParams.MATCH_PARENT, 64);
				TextView textView = new TextView(
						MainActivity.this);
				textView.setLayoutParams(lp);
				textView.setGravity(Gravity.CENTER_VERTICAL);
				textView.setPadding(36, 0, 0, 0);
				textView.setTextSize(20);
				textView.setTextColor(Color.BLACK);
				return textView;
			}

			
			//重写ExpandableListAdapter中的各个方法
			@Override
			public int getGroupCount() {
				return generalsTypes.length;
			}

			@Override
			public Object getGroup(int groupPosition) {
				return generalsTypes[groupPosition];
			}

			@Override
			public long getGroupId(int groupPosition) {
				return groupPosition;
			}

			@Override
			public int getChildrenCount(int groupPosition) {
				return generals[groupPosition].length;
			}

			@Override
			public Object getChild(int groupPosition, int childPosition) {
				return generals[groupPosition][childPosition];
			}

			@Override
			public long getChildId(int groupPosition, int childPosition) {
				return childPosition;
			}

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

			@Override
			public View getGroupView(int groupPosition, boolean isExpanded,
					View convertView, ViewGroup parent) {
				LinearLayout ll = new LinearLayout(
						MainActivity.this);
				ll.setOrientation(0);
				ImageView logo = new ImageView(MainActivity.this);
				logo.setImageResource(logos[groupPosition]);
				logo.setPadding(50, 0, 0, 0);
				ll.addView(logo);
				TextView textView = getTextView();
				textView.setTextColor(Color.BLACK);
				textView.setText(getGroup(groupPosition).toString());
				ll.addView(textView);

				return ll;
			}

			@Override
			public View getChildView(int groupPosition, int childPosition,
					boolean isLastChild, View convertView, ViewGroup parent) {
				LinearLayout ll = new LinearLayout(
						MainActivity.this);
				ll.setOrientation(0);
				ImageView generallogo = new ImageView(
						MainActivity.this);
				generallogo
						.setImageResource(generallogos[groupPosition][childPosition]);
				ll.addView(generallogo);
				TextView textView = getTextView();
				textView.setText(getChild(groupPosition, childPosition)
						.toString());
				ll.addView(textView);
				return ll;
			}

			@Override
			public boolean isChildSelectable(int groupPosition,
					int childPosition) {
				return true;
			}

		};

		ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.list);
		expandableListView.setAdapter(adapter);
		
		
		//设置item点击的监听器
		expandableListView.setOnChildClickListener(new OnChildClickListener() {

			@Override
			public boolean onChildClick(ExpandableListView parent, View v,
					int groupPosition, int childPosition, long id) {

				Toast.makeText(
						MainActivity.this,
						"你点击了" + adapter.getChild(groupPosition, childPosition),
						Toast.LENGTH_SHORT).show();

				return false;
			}
		});
	}
}

效果：