1
package
com.android.osb;
2
3
import
android.app.ExpandableListActivity;
4
import
android.os.Bundle;
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import
android.view.ContextMenu;
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import
android.view.ContextMenu.ContextMenuInfo;
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import
android.view.Gravity;
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import
android.view.MenuItem;
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import
android.view.View;
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import
android.view.ViewGroup;
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import
android.view.ViewGroup.LayoutParams;
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import
android.widget.AbsListView;
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import
android.widget.BaseExpandableListAdapter;
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import
android.widget.ExpandableListAdapter;
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import
android.widget.ExpandableListView;
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import
android.widget.Toast;
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import
android.widget.ExpandableListView.ExpandableListContextMenuInfo;
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import
android.widget.TextView;
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public
class
ExpandableList
extends
ExpandableListActivity {
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private
ExpandableListAdapter expandableListAdapter;
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@Override
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protected
void
onCreate(Bundle savedInstanceState) {
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//
TODO Auto-generated method stub
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super
.onCreate(savedInstanceState);
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expandableListAdapter
=
new
MyExpandable();
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//
设置ListAdapter的Adapter为继承自BaseExpandableListAdapter的一个Adapter
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setListAdapter(expandableListAdapter);
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//
注册长按菜单
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registerForContextMenu(
this
.getExpandableListView());
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}
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@Override
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public
void
onCreateContextMenu(ContextMenu menu, View v,
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ContextMenuInfo menuInfo) {
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//
TODO Auto-generated method stub
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//
弹出的长按菜单的标题
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menu.setHeaderTitle(
"
ContextMenu
"
);
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//
弹出的长按菜单的选项
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menu.add(
0
,
0
,
0
,
"
ContextMenu
"
);
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}
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//
点击长按菜单选项的处理事件
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@Override
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public
boolean
onContextItemSelected(MenuItem item) {
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//
TODO Auto-generated method stub
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//
从MenuItem中拿到ContextMenuInfo，并强制转换成ExpandableListContextMenuInfo.
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ExpandableListContextMenuInfo info
=
(ExpandableListContextMenuInfo) item.getMenuInfo();
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//
将info中的contextMenu正在显示的View的标题拿到，并强制转换成TextView.
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String title
=
((TextView)info.targetView).getText().toString();
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//
从info中拿到packedPosition，并根据packedPosition判断ExpandableListView的类型，是child还是group。
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int
type
=
ExpandableListView.getPackedPositionType(info.packedPosition);
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if
(type
==
ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
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int
groupPos
=
ExpandableListView.getPackedPositionGroup(info.packedPosition);
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int
childPos
=
ExpandableListView.getPackedPositionChild(info.packedPosition);
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//
如果是child，从ExpandableListView中拿到groupPos和childPos.并显示出来。
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Toast.makeText(
this
,
"
title :
"
+
title
+
"
, groupPos :
"
+
groupPos
+
"
, childPos :
"
+
childPos, Toast.LENGTH_LONG).show();
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return
true
;
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}
else
if
(type
==
ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
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int
groupPos
=
ExpandableListView.getPackedPositionGroup(info.packedPosition);
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//
如果是group，从ExpandableListView中拿到groupPos并显示出来。
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Toast.makeText(
this
,
"
title :
"
+
title
+
"
, groupPos :
"
+
groupPos, Toast.LENGTH_LONG).show();
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return
true
;
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}
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return
false
;
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}
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//
这个Adapter是继承BaseExpandableListAdapter的。
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private
class
MyExpandable
extends
BaseExpandableListAdapter {
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//
父列表数据
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private
String[] groups
=
{
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"
group1
"
,
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"
group2
"
,
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"
group3
"
,
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"
group4
"
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};
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//
子列表数据
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private
String[][] children
=
{
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{
"
child1
"
},
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{
"
child1
"
,
"
child2
"
},
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{
"
child1
"
,
"
child2
"
,
"
child3
"
},
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{
"
child1
"
,
"
child2
"
,
"
child3
"
,
"
child4
"
}
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};
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//
根据groupPosition和childPosition拿到child的对象
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@Override
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public
Object getChild(
int
groupPosition,
int
childPosition) {
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//
TODO Auto-generated method stub
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return
children[groupPosition][childPosition];
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}
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//
根据childPosition拿到child的ID
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@Override
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public
long
getChildId(
int
groupPosition,
int
childPosition) {
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//
TODO Auto-generated method stub
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return
childPosition;
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}
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@Override
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public
View getChildView(
int
groupPosition,
int
childPosition,
boolean
isLastchild, View convertView,
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ViewGroup parent) {
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//
TODO Auto-generated method stub
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//
创建一个TextView，并将child对象转换成字符串显示在TextView上面。
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TextView tv
=
getGenericView();
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tv.setText(getChild(groupPosition, childPosition).toString());
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return
tv;
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}
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//
根据groupPosition拿到children的长度。
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@Override
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public
int
getChildrenCount(
int
groupPosition) {
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//
TODO Auto-generated method stub
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return
children[groupPosition].length;
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}
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//
根据groupPosition拿到group的对象
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@Override
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public
Object getGroup(
int
groupPosition) {
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//
TODO Auto-generated method stub
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return
groups[groupPosition];
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}
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@Override
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public
int
getGroupCount() {
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//
TODO Auto-generated method stub
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return
groups.length;
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}
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@Override
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public
long
getGroupId(
int
groupPosition) {
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//
TODO Auto-generated method stub
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return
groupPosition;
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}
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@Override
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public
View getGroupView(
int
groupPosition,
boolean
isExpanded, View convertView,
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ViewGroup parent) {
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//
TODO Auto-generated method stub
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//
创建一个TextView，并将group对象转换成字符串显示在TextView上面。
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TextView tv
=
getGenericView();
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tv.setText(getGroup(groupPosition).toString());
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return
tv;
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}
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@Override
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public
boolean
hasStableIds() {
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//
TODO Auto-generated method stub
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return
true
;
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}
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@Override
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public
boolean
isChildSelectable(
int
groupPosition,
int
childPosition) {
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//
TODO Auto-generated method stub
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return
true
;
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}
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//
创建一个新的TextView对象。
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private
TextView getGenericView () {
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TextView tv
=
new
TextView(ExpandableList.
this
);
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tv.setLayoutParams(
new
AbsListView.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
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tv.setGravity(Gravity.CENTER_VERTICAL
|
Gravity.LEFT);
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tv.setPadding(
32
,
0
,
0
,
0
);
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return
tv;
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}
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}
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}
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代码
