Section Adapter
我使用最初由CommonsWare编码的自定义实现了多个标题场景,您可以在 listivew 中创建部分,如书籍、游戏等。查看下面的代码。
部分适配器:
package com.medplan.db;
import java.util.ArrayList;
import java.util.List;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.BaseAdapter;
abstract public class SectionedAdapter extends BaseAdapter {
String TAG = "========SectionedAdapter============";
abstract protected View getHeaderView(String caption,
int index,
View convertView,
ViewGroup parent);
private List<Section> sections=new ArrayList<Section>();
private static int TYPE_SECTION_HEADER=0;
public SectionedAdapter() {
super();
sections.clear();
}
public void addSection(String caption, Adapter adapter) {
sections.add(new Section(caption, adapter));
}
public void clear() {
sections.clear();
notifyDataSetChanged();
}
public Object getItem(int position) {
for (Section section : this.sections) {
if (position==0) {
return(section);
}
int size=section.adapter.getCount()+1;
if (position<size) {
return(section.adapter.getItem(position-1));
}
position-=size;
}
return(null);
}
public int getCount() {
int total=0;
for (Section section : this.sections) {
total+=section.adapter.getCount()+1; // add one for header
}
return(total);
}
public int getViewTypeCount() {
int total=1; // one for the header, plus those from sections
for (Section section : this.sections) {
total+=section.adapter.getViewTypeCount();
}
return(total);
}
public int getItemViewType(int position) {
int typeOffset=TYPE_SECTION_HEADER+1; // start counting from here
for (Section section : this.sections) {
if (position==0) {
return(TYPE_SECTION_HEADER);
}
int size=section.adapter.getCount()+1;
if (position<size) {
return(typeOffset+section.adapter.getItemViewType(position-1));
}
position-=size;
typeOffset+=section.adapter.getViewTypeCount();
}
return(-1);
}
public boolean areAllItemsSelectable() {
return(false);
}
public boolean isEnabled(int position) {
return(getItemViewType(position)!=TYPE_SECTION_HEADER);
}
public View getView(int position, View convertView,
ViewGroup parent) {
int sectionIndex=0;
for (Section section : this.sections) {
if (position==0) {
return(getHeaderView(section.caption, sectionIndex,
convertView, parent));
}
int size=section.adapter.getCount()+1;
if (position<size) {
return(section.adapter.getView(position-1,convertView,parent));
}
position-=size;
sectionIndex++;
}
return(null);
}
public long getItemId(int position) {
return(position);
}
class Section {
String caption = null;
Adapter adapter = null;
Section(String caption, Adapter adapter) {
this.caption=caption;
this.adapter=adapter;
}
}
}
在 Activity make Section 适配器对象中,查看以下代码:
final SectionedAdapter adapter =new SectionedAdapter()
{
protected View getHeaderView(String caption, int index, View convertView,ViewGroup parent)
{
result=(TextView)convertView;
if (convertView==null)
{
result=(TextView)getLayoutInflater().inflate(R.layout.section_header,null);
}
result.setText(caption);
// temp=caption;
// ind=index;
return(result);
}
};
section_header.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@color/black"
android:textColor="#FFFFFF"
android:ellipsize="end"
android:textSize="11sp"
style="?android:attr/listSeparatorTextViewStyle" />
<!-- android:background="#515050"-->
在活动中添加任意数量的部分,如下所示:
注意:userPic 和 medPic 是数组列表的名称。
adapter.addSection("section first", new EfficientAdapter(getApplicationContext(),usersPic));
adapter.addSection("section second", new EfficientAdapter(getApplicationContext(),medPic));
listview.setAdapter(adapter);