package
cc.testlistview;
import
java.util.ArrayList;
import
java.util.HashMap;
import
android.os.Bundle;
import
android.view.View;
import
android.widget.AdapterView;
import
android.widget.AdapterView.OnItemClickListener;
import
android.widget.ListView;
import
android.app.Activity;
/**
* Demo描述:
* 为ListView的Item设置不同的布局.
* 例如在该例子中ListView的第一个Item显示一张
* 图片,其余的Item都显示文字.
*
* 为了达到此目的需要重写BaseAdapter中的
* 1 getViewTypeCount()和getItemViewType(int position)方法.
* 1.1在getViewTypeCount中指定一共有几种不同的item
* 在此返回2即可.
* 1.2在getItemViewType(int position)中需要依据position的不同
* 返回不同的Type.
* 2 在getView()方法中针对不同的Type为Item设置布局
* 2.1得到当前位置(position)时的Type即代码:
* currentType= getItemViewType(position);
* 2.2依据Type的不同为Item设置布局
*
* 参考资料:
* Thank you very much
*/
public
class
MainActivity
extends
Activity {
private
ListView mListView;
private
HashMap<String, Object> mHashMap;
private
ArrayList<HashMap<String, Object>> mArrayList;
@Override
protected
void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private
void
init(){
mArrayList=
new
ArrayList<HashMap<String,Object>>();
mListView=(ListView) findViewById(R.id.listview);
addDataForListView();
mListView.setAdapter
(
new
ListViewAdapter(MainActivity.
this
, mArrayList, R.layout.othersitem,
new
String []{
"content"
},
new
int
[]{R.id.textView}));
mListView.setOnItemClickListener(
new
ItemClickListenerImpl());
}
private
void
addDataForListView(){
for
(
int
i =
0
; i <
30
; i++) {
mHashMap=
new
HashMap<String, Object>();
mHashMap.put(
"content"
,
"This is ---> "
+i);
mArrayList.add(mHashMap);
}
}
private
class
ItemClickListenerImpl
implements
OnItemClickListener {
@Override
public
void
onItemClick(AdapterView<?> parent, View view,
int
position,
long
arg) {
System.out.println(
"OnItemClickListener position="
+position);
}
}
}
|
ListViewAdapter如下:
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111
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|
package
cc.testlistview;
import
java.util.List;
import
java.util.Map;
import
android.content.Context;
import
android.view.LayoutInflater;
import
android.view.View;
import
android.view.View.OnClickListener;
import
android.view.ViewGroup;
import
android.widget.BaseAdapter;
import
android.widget.ImageView;
import
android.widget.TextView;
public
class
ListViewAdapter
extends
BaseAdapter {
private
List<?
extends
Map<String, ?>> mArrayList;
private
int
resource;
private
LayoutInflater mLayoutInflater;
private
final
int
TYPE_COUNT=
2
;
private
final
int
FIRST_TYPE=
0
;
private
final
int
OTHERS_TYPE=
1
;
private
int
currentType;
public
ListViewAdapter(Context context,List<?
extends
Map<String, ?>> data,
int
resource, String[] from,
int
[] to) {
this
.mArrayList=data;
this
.resource=resource;
mLayoutInflater=(LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
}
@Override
public
int
getCount() {
if
(mArrayList==
null
) {
return
0
;
}
else
{
return
(mArrayList.size()+
1
);
}
}
@Override
public
Object getItem(
int
position) {
if
(mArrayList==
null
) {
return
null
;
}
else
{
if
(position>
0
) {
return
mArrayList.get(position-
1
);
}
else
{
return
mArrayList.get(position+
1
);
}
}
}
@Override
public
long
getItemId(
int
position) {
return
position;
}
///////////////////////////////////////////////////////
@Override
public
int
getViewTypeCount() {
return
TYPE_COUNT;
}
@Override
public
int
getItemViewType(
int
position) {
if
(position==
0
) {
return
FIRST_TYPE;
}
else
{
return
OTHERS_TYPE;
}
}
///////////////////////////////////////////////////////
@Override
public
View getView(
int
position, View convertView, ViewGroup parent) {
View firstItemView =
null
;
View othersItemView=
null
;
//获取到当前位置所对应的Type
currentType= getItemViewType(position);
System.out.println(
"type="
+currentType);
if
(currentType== FIRST_TYPE) {
firstItemView = convertView;
FirstItemViewHolder firstItemViewHolder=
null
;
if
(firstItemView==
null
) {
System.out.println(
"firstItemView==null "
);
firstItemView = mLayoutInflater.inflate(R.layout.firstitem,
null
);
firstItemView.setOnClickListener(
new
OnClickListener() {
@Override
public
void
onClick(View view) {
System.out.println(
"=====click first item======="
);
}
});
firstItemViewHolder=
new
FirstItemViewHolder();
firstItemViewHolder.imageView=(ImageView) firstItemView.findViewById(R.id.imageView);
firstItemView.setTag(firstItemViewHolder);
}
else
{
System.out.println(
"firstItemView!=null "
);
System.out.println(
"111 getClass="
+firstItemView.getTag().getClass().toString());
firstItemViewHolder=(FirstItemViewHolder) firstItemView.getTag();
}
if
(firstItemViewHolder.imageView!=
null
) {
firstItemViewHolder.imageView.setImageResource(R.drawable.ic_launcher);
}
convertView=firstItemView;
}
else
{
othersItemView = convertView;
OthersViewHolder othersViewHolder=
null
;
if
(othersItemView==
null
) {
System.out.println(
"othersItemView==null "
);
othersItemView = mLayoutInflater.inflate(R.layout.othersitem,
null
);
othersViewHolder=
new
OthersViewHolder();
othersViewHolder.textView=(TextView) othersItemView.findViewById(R.id.textView);
othersItemView.setTag(othersViewHolder);
}
else
{
System.out.println(
"othersItemView!=null "
);
System.out.println(
"222 getClass="
+othersItemView.getTag().getClass().toString());
othersViewHolder=(OthersViewHolder) othersItemView.getTag();
}
if
(mArrayList!=
null
) {
if
(othersViewHolder.textView!=
null
) {
othersViewHolder.textView.setText((String)(mArrayList.get(position-
1
).get(
"content"
)));
}
}
convertView=othersItemView;
}
return
convertView;
}
//第一个Item的ViewHolder
private
class
FirstItemViewHolder{
ImageView imageView;
}
//除第一个Item以外其余Item的ViewHolder
private
class
OthersViewHolder{
TextView textView;
}
}
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