Android中ExpandableListView的使用
2011-06-02 14:20
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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
ExpandableAdapter extends
BaseExpandableListAdapter
{
Activity activity;
public
ExpandableAdapter(Activity a)
{
activity = a;
}
public
Object getChild(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
View getChildView(int
groupPosition, int
childPosition,
boolean
isLastChild, View convertView, ViewGroup parent)
{
String string = childArray.get(groupPosition).get(childPosition);
return
getGenericView(string);
}
// group method stub
public
Object getGroup(int
groupPosition)
{
return
groupArray.get(groupPosition);
}
public
int
getGroupCount()
{
return
groupArray.size();
}
public
long
getGroupId(int
groupPosition)
{
return
groupPosition;
}
public
View getGroupView(int
groupPosition, boolean
isExpanded,
View convertView, ViewGroup parent)
{
String string = groupArray.get(groupPosition);
return
getGenericView(string);
}
// View stub to create Group/Children 's View
public
TextView getGenericView(String string)
{
// Layout parameters for the ExpandableListView
AbsListView.LayoutParams layoutParams = new
AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, 64
);
TextView text = new
TextView(activity);
text.setLayoutParams(layoutParams);
// Center the text vertically
text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
// Set the text starting position
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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ExpandableListView expandableListView = (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) {
int groupPos =ExpandableListView.getPackedPositionGroup(menuInfo.packedPosition);
int childPos =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;
}
}
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