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

定义ExpandableListView的Adapter

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//ExpandableListView的Adapter
publicclassExpandableAdapterextendsBaseExpandableListAdapter
{
Activityactivity;
publicExpandableAdapter(Activitya)
{
activity=a;
}
publicObjectgetChild(intgroupPosition,intchildPosition)
{
returnchildArray.get(groupPosition).get(childPosition);
}
publiclonggetChildId(intgroupPosition,intchildPosition)
{
returnchildPosition;
}
publicintgetChildrenCount(intgroupPosition)
{
returnchildArray.get(groupPosition).size();
}
publicViewgetChildView(intgroupPosition,intchildPosition,
booleanisLastChild,ViewconvertView,ViewGroupparent)
{
Stringstring=childArray.get(groupPosition).get(childPosition);
returngetGenericView(string);
}
//groupmethodstub
publicObjectgetGroup(intgroupPosition)
{
returngroupArray.get(groupPosition);
}
publicintgetGroupCount()
{
returngroupArray.size();
}
publiclonggetGroupId(intgroupPosition)
{
returngroupPosition;
}
publicViewgetGroupView(intgroupPosition,booleanisExpanded,
ViewconvertView,ViewGroupparent)
{
Stringstring=groupArray.get(groupPosition);
returngetGenericView(string);
}
//ViewstubtocreateGroup/Children'sView
publicTextViewgetGenericView(Stringstring)
{
//LayoutparametersfortheExpandableListView
AbsListView.LayoutParamslayoutParams=newAbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,64);
TextViewtext=newTextView(activity);
text.setLayoutParams(layoutParams);
//Centerthetextvertically
text.setGravity(Gravity.CENTER_VERTICAL|Gravity.LEFT);
//Setthetextstartingposition
text.setPadding(36,0,0,0);
text.setText(string);
returntext;
}
publicbooleanhasStableIds()
{
returnfalse;
}
publicbooleanisChildSelectable(intgroupPosition,intchildPosition)
{
returntrue;
}
}

最后，给定义好的ExpandableListView添加上Adapter

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ExpandableListViewexpandableListView=(ExpandableListView)findViewById(R.id.expandableListView);
expandableListView.setAdapter(newExpandableAdapter(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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