ExpandableListView的使用

1、用法类似ListView，同样是在布局文件中先定义出此控件，ExpandableListVIew

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
	<ExpandableListView 
	    android:id="@+id/expandable"
	    android:layout_width="fill_parent"
	    android:layout_height="fill_parent"
	    android:background="#ffffff"
	    android:cacheColorHint="#FFFFFF"
	    android:listSelector="#FFFFFF">
	</ExpandableListView>
</LinearLayout>

简单说下的是 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

2、自定义ExapandableListView的适配器，继承BaseExpandableListViewAdapter类，并重写相关方法。

主要是我们在getChildView和getGroupView中进行设计我们现实Group和它子项的模式。然后绑定适配器，同时可以监听控件的事件。

<span style="font-size:12px;">package com.drision.test;

import android.app.Activity;
import android.content.Context;
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.ExpandableListView;
import android.widget.Toast;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ExpandableListViewActivity extends Activity {

	private ExpandableListView expandable;
	private ExpandableAdapter adapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		this.requestWindowFeature(Window.FEATURE_NO_TITLE);
		this.setContentView(R.layout.expandable_activity);
		expandable = (ExpandableListView) this.findViewById(R.id.expandable);
		adapter = new ExpandableAdapter();
		expandable.setAdapter(adapter);
		expandable.setOnChildClickListener(new OnChildClickListener(){

			@Override
			public boolean onChildClick(ExpandableListView parent, View v,
					int groupPosition, int childPosition, long id) {
				Toast.makeText(ExpandableListViewActivity.this, "你点击了" + adapter.getChild(groupPosition, childPosition),
                        Toast.LENGTH_SHORT).show();
				return false;
			}
			
		});
	}

	class ExpandableAdapter extends BaseExpandableListAdapter{
		//设置组的图片
		private int [] groupImage = new int []{R.drawable.lock_icon,R.drawable.lock_icon_2};
		//设置组视图的文字
		private String [] groupName = new String[]{"我的好友","陌生人"};
		
		//设置子视图的图片
		private int [][] childImage = new int [][]{{R.drawable.woyao_add},{R.drawable.xietongapp}};
		//设置子视图的标题
		private String [][]  childName = new String [][]{{"张三"},{"李斯"}};
		
		private Context _this = ExpandableListViewActivity.this;
		
	    TextView getTextView() {
            AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                    ViewGroup.LayoutParams.FILL_PARENT, 64);
            TextView textView = new TextView(
            		_this);
            textView.setLayoutParams(lp);
            textView.setGravity(Gravity.CENTER_VERTICAL);
            textView.setPadding(36, 0, 0, 0);
            textView.setTextSize(20);
            textView.setTextColor(Color.BLACK);
            return textView;
        }
	    
		@Override
		public Object getChild(int groupPosition, int childPosition) {
			return childName[groupPosition][childPosition];
		}

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

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

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

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

		@Override
		public int getGroupCount() {
			return groupName.length;
		}

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

		@Override
		public View getGroupView(int groupPosition, boolean isExpanded,
				View convertView, ViewGroup parent) {
			// 创建一个布局，然后进行图片和文字的显示
			LinearLayout linear = new LinearLayout(_this);
			linear.setOrientation(0);
			ImageView iv = new ImageView(_this);
			iv.setImageResource(groupImage[groupPosition]);
			iv.setPadding(50, 0, 0, 0);
			linear.addView(iv);
			TextView textView = getTextView();
	        textView.setTextColor(Color.BLACK);
	        textView.setText(getGroup(groupPosition).toString());
	        linear.addView(textView);
			return linear;
		}

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

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