android学习笔记13——ExpandableListView

ExpandableListView==>可展开的列表组件

==》

ExpandableListView是ListView的子类，对其进行了扩展，其将应用中的列表项分为几组，每组中又包含多个列表项；

ExpandableListView的用法和ListView非常像，只是其所显示的列表项应该由ExpandableListAdapter提供；

ExpandableListView支持的额外属性：

android:childDivider	指定各组内各子列表项之间的分隔条
android:childIndicator	显示在子列表项旁的Drawable对象
android:groupIndicator	显示在组列表项旁的Drawable对象

实例：

布局文件==》
<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>

实现代码==》
package com.example.myexpandablelistview;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
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
{
	// 设置组视图的图片
	private int[] logos = new int[]
	{ R.drawable.one, R.drawable.two, R.drawable.three };
	// 设置组视图的显示文字
	private String[] generalsTypes = new String[]
	{ "One", "Two", "Three" };
	// 子视图显示文字
	private String[][] generals = new String[][]
	{
	{ "西瓜", "樱桃", "草莓" },
	{ "葡萄", "梨子", "青苹果" },
	{ "香蕉", "橙子", "芒果" } };

	// 子视图图片
	public int[][] generallogos = new int[][]
	{
	{ R.drawable.one, R.drawable.one, R.drawable.one },
	{ R.drawable.two, R.drawable.two, R.drawable.two, },
	{ R.drawable.three, R.drawable.three, R.drawable.three } };

	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);
		final ExpandableListAdapter adapter = new BaseExpandableListAdapter()
		{
			// 自己定义一个获得文字信息的方法
			TextView getTextView()
			{
				@SuppressWarnings("deprecation")
				AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
						ViewGroup.LayoutParams.FILL_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;
			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu)
	{
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
}

实现效果：