Android之BaseExpandableListAdapter的用法

BaseExpandableListAdapter是ExpandableListAdapter的抽象基类，从一些数据中提供数据和视图给可折叠列表视图。

例子详解：

首先定义一个xml布局文件：

[html]
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<?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:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/ecpandable"
/>

</LinearLayout>

<?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:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/ecpandable"
/>

</LinearLayout>

activity文件：

[java]
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package cn.csdn.activity;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ExpandableListViewActivity extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub

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

/**BaseExpandableListAdapter实现了ExpandableListAdapter*/
ExpandableListAdapter adapter = new BaseExpandableListAdapter(){

/**----------定义数组-------------------------------------------------------------------*/
private int[] images = new int[]{
R.drawable.ic_launcher,
R.drawable.stop,
R.drawable.play
};
private String[] armTypes = new String[]{
"神族","虫族","人族"
};
private String[][] arms = new String[][]{
{"狂战士","龙骑士","黑暗圣堂"},
{"小狗","飞龙","自爆妃子"},
{"步兵","伞兵","护士mm"}
};

/*===========组元素表示可折叠的列表项，子元素表示列表项展开后看到的多个子元素项=============*/

/**----------得到armTypes和arms中每一个元素的ID-------------------------------------------*/

//获取组在给定的位置编号，即armTypes中元素的ID

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

//获取在给定的组的儿童的ID，就是arms中元素的ID

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

/**----------根据上面得到的ID的值，来得到armTypes和arms中元素的个数 ------------------------*/

//获取的群体数量，得到armTypes里元素的个数

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

//取得指定组中的儿童人数，就是armTypes中每一个种族它军种的个数

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

/**----------利用上面getGroupId得到ID，从而根据ID得到armTypes中的数据，并填到TextView中 -----*/

//获取与给定的组相关的数据，得到数组armTypes中元素的数据

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

//获取一个视图显示给定组，存放armTypes

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
TextView textView = getTextView();//调用定义的getTextView()方法

textView.setText(getGroup(groupPosition).toString());//添加数据

return textView;
}

/**----------利用上面getChildId得到ID，从而根据ID得到arms中的数据，并填到TextView中---------*/

//获取与孩子在给定的组相关的数据,得到数组arms中元素的数据

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

//获取一个视图显示在给定的组 的儿童的数据，就是存放arms

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
View convertView, ViewGroup parent) {
LinearLayout ll = new LinearLayout(ExpandableListViewActivity.this);
ll.setOrientation(0);//定义为纵向排列

ImageView logo = new ImageView(ExpandableListViewActivity.this);
logo.setImageResource(images[groupPosition]);//添加图片

ll.addView(logo);
TextView textView = getTextView();//调用定义的getTextView()方法

textView.setText(getChild(groupPosition,childPosition).toString());//添加数据

ll.addView(textView);
return ll;
}

/**------------------自定义一个设定TextView属性的方法----------------------------------------------*/

//定义一个TextView

private TextView getTextView(){
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,40);
TextView textView = new TextView(ExpandableListViewActivity.this);
textView.setLayoutParams(lp);
textView.setPadding(36, 0, 0, 0);
textView.setTextSize(20);
return textView;
}

/**-------------------其他设置-------------------------------------------------------------------*/

//孩子在指定的位置是可选的，即：arms中的元素是可点击的

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

//表示孩子是否和组ID是跨基础数据的更改稳定

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

/**使用适配器*/
ExpandableListView expandListView = (ExpandableListView) this.findViewById(R.id.ecpandable);
expandListView.setAdapter(adapter);
}

}

package cn.csdn.activity;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ExpandableListViewActivity extends Activity{

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.expandable_layout);

/**BaseExpandableListAdapter实现了ExpandableListAdapter*/
ExpandableListAdapter adapter = new BaseExpandableListAdapter(){

/**----------定义数组-------------------------------------------------------------------*/
private int[] images = new int[]{
R.drawable.ic_launcher,
R.drawable.stop,
R.drawable.play
};
private String[] armTypes = new String[]{
"神族","虫族","人族"
};
private String[][] arms = new String[][]{
{"狂战士","龙骑士","黑暗圣堂"},
{"小狗","飞龙","自爆妃子"},
{"步兵","伞兵","护士mm"}
};

/*===========组元素表示可折叠的列表项，子元素表示列表项展开后看到的多个子元素项=============*/

/**----------得到armTypes和arms中每一个元素的ID-------------------------------------------*/

//获取组在给定的位置编号，即armTypes中元素的ID
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}

//获取在给定的组的儿童的ID，就是arms中元素的ID
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}

/**----------根据上面得到的ID的值，来得到armTypes和arms中元素的个数 ------------------------*/

//获取的群体数量，得到armTypes里元素的个数
@Override
public int getGroupCount() {
return armTypes.length;
}

//取得指定组中的儿童人数，就是armTypes中每一个种族它军种的个数
@Override
public int getChildrenCount(int groupPosition) {
return arms[groupPosition].length;
}

/**----------利用上面getGroupId得到ID，从而根据ID得到armTypes中的数据，并填到TextView中 -----*/

//获取与给定的组相关的数据，得到数组armTypes中元素的数据
@Override
public Object getGroup(int groupPosition) {
return armTypes[groupPosition];
}

//获取一个视图显示给定组，存放armTypes
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
TextView textView = getTextView();//调用定义的getTextView()方法
textView.setText(getGroup(groupPosition).toString());//添加数据
return textView;
}

/**----------利用上面getChildId得到ID，从而根据ID得到arms中的数据，并填到TextView中---------*/

//获取与孩子在给定的组相关的数据,得到数组arms中元素的数据
@Override
public Object getChild(int groupPosition, int childPosition) {
return arms[groupPosition][childPosition];
}

//获取一个视图显示在给定的组 的儿童的数据，就是存放arms
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
View convertView, ViewGroup parent) {
LinearLayout ll = new LinearLayout(ExpandableListViewActivity.this);
ll.setOrientation(0);//定义为纵向排列
ImageView logo = new ImageView(ExpandableListViewActivity.this);
logo.setImageResource(images[groupPosition]);//添加图片
ll.addView(logo);
TextView textView = getTextView();//调用定义的getTextView()方法
textView.setText(getChild(groupPosition,childPosition).toString());//添加数据
ll.addView(textView);
return ll;
}

/**------------------自定义一个设定TextView属性的方法----------------------------------------------*/

//定义一个TextView
private TextView getTextView(){
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,40);
TextView textView = new TextView(ExpandableListViewActivity.this);
textView.setLayoutParams(lp);
textView.setPadding(36, 0, 0, 0);
textView.setTextSize(20);
return textView;
}

/**-------------------其他设置-------------------------------------------------------------------*/

//孩子在指定的位置是可选的，即：arms中的元素是可点击的
@Override
public boolean isChildSelectable(int groupPosition,
int childPosition) {
return true;
}

//表示孩子是否和组ID是跨基础数据的更改稳定
public boolean hasStableIds() {
return true;
}
};

/**使用适配器*/
ExpandableListView expandListView = (ExpandableListView) this.findViewById(R.id.ecpandable);
expandListView.setAdapter(adapter);
}

}

效果图：



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