Android中ExpandableListView的使用

ExpandableListView是android中可以实现下拉list的一个控件，具体的实现方法如下：

首先：在layout的xml文件中定义一个ExpandableListView

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< LinearLayout
android:id ="@+id/linearLayout"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
androidrientation ="vertical"
>
< ExpandableListView
android:id ="@+id/expandableListView"
android:layout_width ="fill_parent"
android:layout_height ="wrap_content"
/>
</ LinearLayout >

定义两个List，用来存放控件中Group/Child中的String

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private List<String>groupArray;
private List<List<String>>childArray;

对这两个List进行初始化，并插入一些数据

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groupArray=new ArrayList<String>();
childArray=new ArrayList<List<String>>();
groupArray.add("第一行" );
groupArray.add("第二行" );
List<String>tempArray=new ArrayList<String>();
tempArray.add("第一条" );
tempArray.add("第二条" );
tempArray.add("第三条" );
for (int index=0 ;index<groupArray.size();++index)
{
childArray.add(tempArray);
}

定义ExpandableListView的Adapter

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//ExpandableListView的Adapter
public class ExpandableAdapterextends BaseExpandableListAdapter
{
Activityactivity;
public ExpandableAdapter(Activitya)
{
activity=a;
}
public ObjectgetChild(int groupPosition,int childPosition)
{
return childArray.get(groupPosition).get(childPosition);
}
public long getChildId(int groupPosition,int childPosition)
{
return childPosition;
}
public int getChildrenCount(int groupPosition)
{
return childArray.get(groupPosition).size();
}
public ViewgetChildView(int groupPosition,int childPosition,
boolean isLastChild,ViewconvertView,ViewGroupparent)
{
Stringstring=childArray.get(groupPosition).get(childPosition);
return getGenericView(string);
}
//groupmethodstub
public ObjectgetGroup(int groupPosition)
{
return groupArray.get(groupPosition);
}
public int getGroupCount()
{
return groupArray.size();
}
public long getGroupId(int groupPosition)
{
return groupPosition;
}
public ViewgetGroupView(int groupPosition,boolean isExpanded,
ViewconvertView,ViewGroupparent)
{
Stringstring=groupArray.get(groupPosition);
return getGenericView(string);
}
//ViewstubtocreateGroup/Children'sView
public TextViewgetGenericView(Stringstring)
{
//LayoutparametersfortheExpandableListView
AbsListView.LayoutParamslayoutParams=new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,64 );
TextViewtext=new TextView(activity);
text.setLayoutParams(layoutParams);
//Centerthetextvertically
text.setGravity(Gravity.CENTER_VERTICAL|Gravity.LEFT);
//Setthetextstartingposition
text.setPadding(36 ,0 ,0 ,0 );
text.setText(string);
return text;
}
public boolean hasStableIds()
{
return false ;
}
public boolean isChildSelectable(int groupPosition,int childPosition)
{
return true ;
}
}

最后，给定义好的ExpandableListView添加上Adapter

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ExpandableListViewexpandableListView=(ExpandableListView)findViewById(R.id.expandableListView);
expandableListView.setAdapter(new ExpandableAdapter(Main.this ));

运行即可见效果~~~

----------------------------------------------------------------------------------------------------------------

Android版手风琴(ExpandableListView)

先看效果，过瘾一番。

源码下载：http://files.cnblogs.com/salam/WidgetDemo.rar

　　ExpandableListView是Android中的手风琴，本人感觉效果相当棒。

　　一、ExpandableListView介绍

　　　　一个垂直滚动的显示两个级别（Child,Group）列表项的视图，列表项来自ExpandableListAdapter 。组可以单独展开。

　　1.重要方法

　　　　　　expandGroup (int groupPos) :在分组列表视图中展开一组，

　　　　　　setSelectedGroup (int groupPosition) ：设置选择指定的组。

　　　　　　setSelectedChild (int groupPosition, int childPosition, boolean shouldExpandGroup) ：设置选择指定的子项。

　　　　　　getPackedPositionGroup (long packedPosition) ：返回所选择的组

　　　　　　getPackedPositionForChild (int groupPosition, int childPosition) ：返回所选择的子项

　　　　　　getPackedPositionType (long packedPosition) ：返回所选择项的类型（Child,Group）

　　　　　　isGroupExpanded (int groupPosition) :判断此组是否展开

　　2.代码：

ExpandableListContextMenuInfo menuInfo=(ExpandableListContextMenuInfo)item.getMenuInfo();
String title=((TextView)menuInfo.targetView).getText().toString();
int type=ExpandableListView.getPackedPositionType(menuInfo.packedPosition);

if (type==ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
intgroupPos =ExpandableListView.getPackedPositionGroup(menuInfo.packedPosition);
intchildPos =ExpandableListView.getPackedPositionChild(menuInfo.packedPosition);

二、ExpandableListAdapter

　　　　一个接口，将基础数据链接到一个ExpandableListView。此接口的实施将提供访问Child的数据（由组分类），并实例化的Child和Group。

　　1.重要方法

　　　　getChildId (int groupPosition, int childPosition) 获取与在给定组给予孩子相关的数据。

　　　　getChildrenCount (int groupPosition) 返回在指定Group的Child数目。

　　2.代码

public class MyExpandableListAdapter extends BaseExpandableListAdapter {
// Sample data set. children[i] contains the children (String[]) for groups[i].
public String[] groups = { "我的好友", "新疆同学", "亲戚", "同事" };
public String[][] children = {
{ "胡算林", "张俊峰", "王志军", "二人" },
{ "李秀婷", "蔡乔", "别高", "余音" },
{ "摊派新", "张爱明" },
{ "马超", "司道光" }
};

public Object getChild(int groupPosition, int childPosition) {
return children[groupPosition][childPosition];
}

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

public int getChildrenCount(int groupPosition) {
return children[groupPosition].length;
}

public TextView getGenericView() {
// Layout parameters for the ExpandableListView
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT, 64);

TextView textView = new TextView(ExpandableListDemo.this);
textView.setLayoutParams(lp);
// Center the text vertically
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
// Set the text starting position
textView.setPadding(36, 0, 0, 0);
return textView;
}

public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
View convertView, ViewGroup parent) {
TextView textView = getGenericView();
textView.setText(getChild(groupPosition, childPosition).toString());
return textView;
}

public Object getGroup(int groupPosition) {
return groups[groupPosition];
}

public int getGroupCount() {
return groups.length;
}

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

public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
ViewGroup parent) {
TextView textView = getGenericView();
textView.setText(getGroup(groupPosition).toString());
return textView;
}

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

public boolean hasStableIds() {
return true;
}

}

Android中ExpandableListView的使用

Android中ExpandableListView的使用

Android版手风琴(ExpandableListView)

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