android expandablelistview简单应用,android ExpandableListView简单例子

android中常常要用到ListView，有时也要用到ExpandableListView，如在手机设置中，对于分类有很好的效果，会用ListView的人一定会用ExpandableListView，因为

ExpandableListView extends ListView的，下面来看个简单的例子

运行效果图：

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity" >

android:id="@+id/expendlist"

android:layout_width="match_parent"

android:layout_height="wrap_content" >

//扩展ListView的头List布局文件

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="horizontal" >

android:id="@+id/txt"

android:layout_width="wrap_content"

android:layout_height="wrap_content" />

android:id="@+id/img"

android:layout_width="wrap_content"

android:layout_height="wrap_content" />

//扩展ListView的子List布局文件

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal"

android:padding="10.0dp" >

android:id="@+id/img"

android:layout_width="20.0dp"

android:layout_height="20.0dp" />

android:id="@+id/txt"

android:layout_width="wrap_content"

android:layout_height="wrap_content" />

package com.example.test;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseExpandableListAdapter;

import android.widget.ExpandableListView;

import android.widget.ImageView;

import android.widget.TextView;

public class MainActivity extends Activity {

private ExpandableListView expandableListView;

private List group_list;

private List> item_list;

private List> item_list2;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//随便一堆测试数据

group_list = new ArrayList();

group_list.add("A");

group_list.add("B");

group_list.add("C");

item_list = new ArrayList>();

item_list.add(group_list);

item_list.add(group_list);

item_list.add(group_list);

List tmp_list = new ArrayList();

tmp_list.add(R.drawable.ic_launcher);

tmp_list.add(R.drawable.ic_launcher);

tmp_list.add(R.drawable.ic_launcher);

item_list2 = new ArrayList>();

item_list2.add(tmp_list);

item_list2.add(tmp_list);

item_list2.add(tmp_list);

expandableListView = (ExpandableListView) findViewById(R.id.expendlist);

expandableListView.setAdapter(new MyExpandableListViewAdapter(this));

}

//用过ListView的人一定很熟悉，只不过这里是BaseExpandableListAdapter

class MyExpandableListViewAdapter extends BaseExpandableListAdapter {

private Context context;

public MyExpandableListViewAdapter(Context context) {

this.context = context;

}

@Override

public int getGroupCount() {

return group_list.size();

}

@Override

public int getChildrenCount(int groupPosition) {

return item_list.get(groupPosition).size();

}

@Override

public Object getGroup(int groupPosition) {

return group_list.get(groupPosition);

}

@Override

public Object getChild(int groupPosition, int childPosition) {

return item_list.get(groupPosition).get(childPosition);

}

@Override

public long getGroupId(int groupPosition) {

return groupPosition;

}

@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) {

GroupHolder groupHolder = null;

if (convertView == null) {

convertView = (View) getLayoutInflater().from(context).inflate(

R.layout.expendlist_group, null);

groupHolder = new GroupHolder();

groupHolder.txt = (TextView) convertView.findViewById(R.id.txt);

// groupHolder.img = (ImageView) convertView

// .findViewById(R.id.img);

convertView.setTag(groupHolder);

} else {

groupHolder = (GroupHolder) convertView.getTag();

}

groupHolder.txt.setText(group_list.get(groupPosition));

return convertView;

}

@Override

public View getChildView(int groupPosition, int childPosition,

boolean isLastChild, View convertView, ViewGroup parent) {

ItemHolder itemHolder = null;

if (convertView == null) {

convertView = (View) getLayoutInflater().from(context).inflate(

R.layout.expendlist_item, null);

itemHolder = new ItemHolder();

itemHolder.txt = (TextView) convertView.findViewById(R.id.txt);

itemHolder.img = (ImageView) convertView.findViewById(R.id.img);

convertView.setTag(itemHolder);

} else {

itemHolder = (ItemHolder) convertView.getTag();

}

itemHolder.txt.setText(item_list.get(groupPosition).get(

childPosition));

itemHolder.img.setBackgroundResource(item_list2.get(groupPosition).get(

childPosition));

return convertView;

}

@Override

public boolean isChildSelectable(int groupPosition, int childPosition) {

return true;

}

}

class GroupHolder {

public TextView txt;

public ImageView img;

}

class ItemHolder {

public ImageView img;

public TextView txt;

}

}

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