Android ExpandableListView的使用
一、MainActivity要继承ExpandableListActivity。效果是当单机ListView的子项是显示另一个ListView。
public
class
MainActivity
extends
ExpandableListActivity {
private
static
final
String NAME =
"NAME"
;
private
static
final
String IS_EVEN =
"IS_EVEN"
;
private
ExpandableListAdapter eListAdapter;
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
List<Map<String,String>> groupData =
new
ArrayList<Map<String,String>>();
List<List<Map<String, String>>> childDataList =
new
ArrayList<List<Map<String,String>>>();
for
(
int
i =
0
; i <
10
; i++) {
Map<String, String> curGroupMap =
new
HashMap<String, String>();
groupData.add(curGroupMap);
curGroupMap.put(NAME,
"Group"
+i);
curGroupMap.put(IS_EVEN, (i%
2
==
0
)?
"This group is even"
:
"This group is odd"
);
List<Map<String, String>> children =
new
ArrayList<Map<String,String>>();
for
(
int
j =
0
; j <
8
; j++) {
Map<String, String> curChildMap =
new
HashMap<String, String>();
children.add(curChildMap);
curChildMap.put(NAME,
"Child"
+ j);
curChildMap.put(IS_EVEN, (j %
2
==
0
) ?
"This child is even"
:
"This child is odd"
);
}
childDataList.add(children);
}
eListAdapter =
new
SimpleExpandableListAdapter(
this
,
groupData,
android.R.layout.simple_expandable_list_item_2,
new
String[] {NAME, IS_EVEN },
new
int
[] { android.R.id.text1, android.R.id.text2},
childDataList,
android.R.layout.simple_expandable_list_item_2,
new
String[] {NAME, IS_EVEN},
new
int
[] { android.R.id.text1, android.R.id.text2});
setListAdapter(eListAdapter);
}
}
|
代码解释
1、groupData是父数据 ，childDataList是子数据。
2、android.R.layout.simple_expandable_list_item_2表示list的实现方式
3、new String[] { NAME,IS_EVEN}list需要显示的数据。
效果图：
也就是单机Group2时，显示Group2的数据。
二、数据源：SimpleCursorTreeAdapter的使用
显示通讯录中的姓名，单击用姓名，显示号码。前提还要分配读取通讯录的权限
<uses-permission android:name=
"android.permission.READ_CONTACTS"
/>
|
代码如下：
public
class
ExpandableList2
extends
ExpandableListActivity {
private
int
mGroupIdColumnIndex;
private
String mPhoneNumberProjection[] =
new
String[] {
People.Phones._ID, People.Phones.NUMBER
};
private
ExpandableListAdapter mAdapter;
@Override
public
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
// Query for people
Cursor groupCursor = managedQuery(People.CONTENT_URI,
new
String[] {People._ID, People.NAME},
null
,
null
,
null
);
// Cache the ID column index
mGroupIdColumnIndex = groupCursor.getColumnIndexOrThrow(People._ID);
// Set up our adapter
mAdapter =
new
MyExpandableListAdapter(groupCursor,
this
,
android.R.layout.simple_expandable_list_item_1,
android.R.layout.simple_expandable_list_item_1,
new
String[] {People.NAME},
// Name for group layouts
new
int
[] {android.R.id.text1},
new
String[] {People.NUMBER},
// Number for child layouts
new
int
[] {android.R.id.text1});
setListAdapter(mAdapter);
}
public
class
MyExpandableListAdapter
extends
SimpleCursorTreeAdapter {
public
MyExpandableListAdapter(Cursor cursor, Context context,
int
groupLayout,
int
childLayout, String[] groupFrom,
int
[] groupTo, String[] childrenFrom,
int
[] childrenTo) {
super
(context, cursor, groupLayout, groupFrom, groupTo, childLayout, childrenFrom,
childrenTo);
}
@Override
protected
Cursor getChildrenCursor(Cursor groupCursor) {
// Given the group, we return a cursor for all the children within that group
// Return a cursor that points to this contact's phone numbers
Uri.Builder builder = People.CONTENT_URI.buildUpon();
ContentUris.appendId(builder, groupCursor.getLong(mGroupIdColumnIndex));
builder.appendEncodedPath(People.Phones.CONTENT_DIRECTORY);
Uri phoneNumbersUri = builder.build();
// The returned Cursor MUST be managed by us, so we use Activity's helper
// functionality to manage it for us.
return
managedQuery(phoneNumbersUri, mPhoneNumberProjection,
null
,
null
,
null
);
}
}
|
三、通过BaseExpandableListAdapter绑定数据
1.BaseExpandableListAdapter
public
class
ExpandableList3
extends
Activity {
private
String[] groups = {
"group1"
,
"group2"
,
"group3"
,
"group4"
};
private
String[][] children = {
{
"g1 item1"
,
"g1 item2"
,
"g1 item3"
,
"g1 item4"
},
{
"g2 item1"
,
"g2 item2"
,
"g2 item3"
,
"g2 item4"
},
{
"g3 item1"
,
"g3 item2"
},
{
"g4 item1"
,
"g4 item2"
}
};
//ExpandableListAdapter mAdapter;
private
ExpandableListView expandableListView;
private
TextView tView =
null
;
@Override
public
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tView = (TextView)findViewById(R.id.textView1);
expandableListView = (ExpandableListView)findViewById(R.id.expandableListView1);
ExpandableListAdapter adapter =
new
BaseExpandableListAdapter() {
@Override
public
boolean
isChildSelectable(
int
groupPosition,
int
childPosition) {
// TODO Auto-generated method stub
String string = groups[groupPosition] + children[groupPosition][childPosition];
tView.setText(string);
return
true
;
}
@Override
public
boolean
hasStableIds() {
// TODO Auto-generated method stub
return
true
;
}
@Override
public
View getGroupView(
int
groupPosition,
boolean
isExpanded,
View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LinearLayout layout =
new
LinearLayout(ExpandableList3.
this
);
layout.setOrientation(
0
);
layout.setPadding(
50
,
0
,
0
,
0
);
ImageView imageView =
new
ImageView(ExpandableList3.
this
);
imageView.setImageResource(R.drawable.ic_launcher);
layout.addView(imageView);
TextView textView = getTextView();
textView.setText(getGroup(groupPosition).toString());
layout.addView(textView);
return
layout;
}
private
TextView getTextView() {
// TODO Auto-generated method stub
AbsListView.LayoutParams lParams =
new
AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
64
);
TextView textView =
new
TextView(ExpandableList3.
this
);
textView.setLayoutParams(lParams);
textView.setPadding(
20
,
0
,
0
,
0
);
textView.setGravity(Gravity.LEFT | Gravity.CENTER_VERTICAL);
return
textView;
}
@Override
public
long
getGroupId(
int
groupPosition) {
// TODO Auto-generated method stub
return
groupPosition;
}
@Override
public
int
getGroupCount() {
// TODO Auto-generated method stub
return
groups.length;
}
@Override
public
Object getGroup(
int
groupPosition) {
// TODO Auto-generated method stub
return
groups[groupPosition];
}
@Override
public
int
getChildrenCount(
int
groupPosition) {
// TODO Auto-generated method stub
return
children[groupPosition].length;
}
@Override
public
View getChildView(
int
groupPosition,
int
childPosition,
boolean
isLastChild, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
TextView textView = getTextView();
textView.setText(getChild(groupPosition, childPosition).toString());
return
textView;
}
@Override
public
long
getChildId(
int
groupPosition,
int
childPosition) {
// TODO Auto-generated method stub
return
childPosition;
}
@Override
public
Object getChild(
int
groupPosition,
int
childPosition) {
// TODO Auto-generated method stub
return
children[groupPosition][childPosition];
}
};
expandableListView.setAdapter(adapter);
}
}
|
效果图：点击子项时，显示子项的信息。
2.数据源写一个类MyExpandableListAdapter，该类继承自 BaseExpandableListAdapter。
public
class
ExpandableList1
extends
ExpandableListActivity {
ExpandableListAdapter mAdapter;
@Override
public
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
// Set up our adapter
mAdapter =
new
MyExpandableListAdapter();
setListAdapter(mAdapter);
// register context menu, when long click the item, it will show a dialog
registerForContextMenu(getExpandableListView());
}
@Override
public
boolean
onContextItemSelected(MenuItem item) {
ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();
String title = ((TextView) info.targetView).getText().toString();
int
type = ExpandableListView.getPackedPositionType(info.packedPosition);
if
(type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
int
groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
int
childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);
Toast.makeText(
this
, title +
": Child "
+ childPos +
" clicked in group "
+ groupPos,
Toast.LENGTH_SHORT).show();
return
true
;
}
else
if
(type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
int
groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
Toast.makeText(
this
, title +
": Group "
+ groupPos +
" clicked"
, Toast.LENGTH_SHORT).show();
return
true
;
}
return
false
;
}
/**
* A simple adapter which maintains an ArrayList of photo resource Ids.
* Each photo is displayed as an image. This adapter supports clearing the
* list of photos and adding a new photo.
*
*/
public
class
MyExpandableListAdapter
extends
BaseExpandableListAdapter {
// Sample data set. children[i] contains the children (String[]) for groups[i].
private
String[] groups = {
"People Names"
,
"Dog Names"
,
"Cat Names"
,
"Fish Names"
};
private
String[][] children = {
{
"Arnold"
,
"Barry"
,
"Chuck"
,
"David"
},
{
"Ace"
,
"Bandit"
,
"Cha-Cha"
,
"Deuce"
},
{
"Fluffy"
,
"Snuggles"
},
{
"Goldy"
,
"Bubbles"
}
};
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.FILL_PARENT,
64
);
TextView textView =
new
TextView(ExpandableList1.
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
;
}
}
}
|
效果图：
本文转自Work Hard Work Smart博客园博客，原文链接：http://www.cnblogs.com/linlf03/archive/2013/03/25/2980293.html，如需转载请自行联系原作者
