android中的多级列表的应用

1.看看布局文件main.xml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"
    android:background="@drawable/bg" 
    >
    <TextView 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="那些上过与即将被上的大学课程:"
        android:textColor="#FF6100"
        android:textSize="20dp"
        
        
        />
<ExpandableListView 
    android:id="@+id/elistview"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginLeft="5dp"
   
    
    />
</LinearLayout>

2.接着看看主活动mainActivity.java

package com.wang;

import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.Toast;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;

public class MaintActivity extends Activity {
	// 创建一个上下文菜单的方法
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {

		super.onCreateContextMenu(menu, v, menuInfo);

		// 一个垂直滚动的两级列表。取得菜单项
		ExpandableListView.ExpandableListContextMenuInfo info = (ExpandableListView.ExpandableListContextMenuInfo) menuInfo;
		// 获得这个类型 的位置
		int type = ExpandableListView
				.getPackedPositionType(info.packedPosition);
		// 取得所在组的索引
		int group = ExpandableListView
				.getPackedPositionGroup(info.packedPosition);
		// 取得子菜单的索引
		int child = ExpandableListView
				.getPackedPositionGroup(info.packedPosition);

		Toast.makeText(MaintActivity.this,
				"类型 =" + type + "  分组：" + group + "  子选项：" + child,
				Toast.LENGTH_LONG).show();

	}

	private ExpandableListView eListView = null;
	private ExpandableListAdapter adapter = null;

	@Override
	public void onCreate(Bundle savedInstanceState) {

		// 去除标题,
		this.requestWindowFeature(Window.FEATURE_NO_TITLE);
		// 取消状态栏，充满全屏
		this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
				WindowManager.LayoutParams.FLAG_FULLSCREEN);

		super.onCreate(savedInstanceState);
		super.setContentView(R.layout.main);

		// 实例化组件
		this.eListView = (ExpandableListView) findViewById(R.id.elistview);

		// 声明一个adapter对象
		adapter = new myExpendableadapler(this);
		// 设置适配器提供了数据
		this.eListView.setAdapter(this.adapter);

		// 　注册一个上下文菜单显示给定的视图(多个视图可以显示上下文菜单)。
		super.registerForContextMenu(this.eListView);

		// 设置点击时候触发的事件 1，子选项点击事件 2。父选项单击事件 3.分组打开事件 4.分组关闭事件
		this.eListView.setOnChildClickListener(new ChildClickListener());
		this.eListView.setOnGroupClickListener(new GroupClickListener());
		this.eListView.setOnGroupExpandListener(new GroupExpandListener());
		this.eListView.setOnGroupCollapseListener(new GroupCollapseListener());

	}

	// /1，子选项点击事件
	private class ChildClickListener implements OnChildClickListener {

		public boolean onChildClick(ExpandableListView parent, View v,
				int groupPosition, int childPosition, long id) {
			Toast
					.makeText(
							MaintActivity.this,
							"子选项被选中,所的组：" + groupPosition + "  子选项的位置："
									+ childPosition, Toast.LENGTH_LONG).show();
			return false;
		}

	}

	// 2。父选项单击事件
	private class GroupClickListener implements OnGroupClickListener {

		public boolean onGroupClick(ExpandableListView parent, View v,
				int groupPosition, long id) {
			Toast.makeText(MaintActivity.this, "分组选项被选中,所在组： " + groupPosition,
					Toast.LENGTH_LONG).show();
			return false;
		}

	}

	// 3.分组打开事件
	private class GroupExpandListener implements OnGroupExpandListener {

		public void onGroupExpand(int groupPosition) {
			// TODO Auto-generated method stub
			Toast.makeText(MaintActivity.this, "打开分组,所在组：" + groupPosition,
					Toast.LENGTH_LONG).show();
		}

	}

	// 4.分组关闭事件
	private class GroupCollapseListener implements OnGroupCollapseListener {

		public void onGroupCollapse(int groupPosition) {
			Toast.makeText(MaintActivity.this, "关闭分组,所在组：" + groupPosition,
					Toast.LENGTH_LONG).show();
		}

	}

}

3.主活动的实现需要一个适配器，myExpendableadapler.java

package com.wang;

import android.content.Context;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class myExpendableadapler extends BaseExpandableListAdapter {
	// 组名称
	private String[] group = new String[] { "专业课", "公共课", "选修课", "选逃课" };
	// 子选项的名字
	private String[][] child = new String[][] {
			{ "C语言", "java程序设计基础教程", "数据库原理与应用", "数据结构", "linux下的嵌入式C语言编程",
					"linux桌面应用程序设计", "计算机操作系统", "计算机组成原理" },
			{ "大学英语", "马克思哲学原理", "形势与政策", "ARM体系结构", "嵌入式软件开发", "软件工程" },
			{ "音乐鉴赏", "市场营销", "android开发与应用", "Visual C++实用教程", "算法分析与程序设计" },
			{ "马克思哲学原理", "形势与政策" } };
	private Context context = null;

	// 构造函数
	public myExpendableadapler(Context context) {

		this.context = context;
	}

	public Object getChild(int groupPosition, int childPosition) {

		return this.child[groupPosition][childPosition];
	}

	public long getChildId(int groupPosition, int childPosition) {

		return childPosition;
	}

	private TextView buildTextView() {
		//LayoutParams AbsListView扩展提供一个位置来保存视图类型。
		AbsListView.LayoutParams params = new AbsListView.LayoutParams(
				ViewGroup.LayoutParams.FILL_PARENT, 40);
		
		TextView textView = new TextView(this.context);
		textView.setLayoutParams(params);
		//大小
		textView.setTextSize(15.0f);
		textView.setGravity(Gravity.LEFT+3);
		textView.setPadding(40, 8, 3, 3);
		return textView;
	}

	public View getChildView(int groupPosition, int childPosition,
			boolean isLastChild, View convertView, ViewGroup parent) {
		TextView textView = new TextView(this.context);
		//得到每组的子选项并转换成字符串
		textView.setText(this.getChild(groupPosition, childPosition).toString());

		return textView;
	}
//统计子选项的个数
	public int getChildrenCount(int groupPosition) {
		// TODO Auto-generated method stub
		return this.child[groupPosition].length;
	}
//得到复选项的位置
	public Object getGroup(int groupPosition) {
		// TODO Auto-generated method stub
		return this.group[groupPosition];
	}
	//得到复选项的个数
	public int getGroupCount() {
		// TODO Auto-generated method stub
		return this.group.length;
	}
	//得到复选项的id
	public long getGroupId(int groupPosition) {
		// TODO Auto-generated method stub
		return groupPosition;
	}

	public View getGroupView(int groupPosition, boolean isExpanded,
			View convertView, ViewGroup parent) {
		// TODO Auto-generated method stub
		TextView textView = this.buildTextView();
		textView.setText(this.getGroup(groupPosition).toString());
		return textView;
	}
//是否子选项和父选项id是稳定在改变底层数据。
	public boolean hasStableIds() {
		// TODO Auto-generated method stub
		return true;
	}
//p判断子选项是否可以选择
	public boolean isChildSelectable(int groupPosition, int childPosition) {
		// TODO Auto-generated method stub
		return true;
	}

}