ListView之自定义适配器的使用
2015-05-05 08:52
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1通过.实例来描述:
二..实现此功能有以下步骤:
1.ListView及ListView_Item
2.实体类的编写
3.自定义适配器的书写
4.ListView的绑定数据源与控件
<编码实现>
自定义适配器MyAdapter
package cn.edu.bzu.list_view1;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class MyAdapter extends BaseAdapter {
private List<People> list;
private Context mContext;
private LayoutInflater mInflater;
//定义构造方法
public MyAdapter(List<People> list, Context mContext) {
super();
this.list = list;
this.mContext = mContext;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder hr=null;
if(convertView==null){
convertView=mInflater.from(mContext).inflate(R.layout.fruit_item,null);
hr=new ViewHolder();
hr.Image=(ImageView)convertView.findViewById(R.id.Ivimage);
hr.Name=(TextView)convertView.findViewById(R.id.tvName);
hr.Contents=(TextView)convertView.findViewById(R.id.tvNews);
convertView.setTag(hr); //设置setTag使得程序得以优化
}else{
hr=(ViewHolder) convertView.getTag();
}
//给控件赋值
hr.Image.setBackgroundResource(list.get(position).getImageId());
hr.Name.setText(list.get(position).getName());
hr.Contents.setText(list.get(position).getNews());
return convertView;
}
class ViewHolder{
ImageView Image;
TextView Name;
TextView Contents;
}
}
实体类People:
package cn.edu.bzu.list_view1;
public class People{
private String name;
private int imageId;
private String News;
public People(String name,int imageId,String News){
super();
this.name=name;
this.imageId=imageId;
this.News=News;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getImageId() {
return imageId;
}
public void setImageId(int imageId) {
this.imageId = imageId;
}
public String getNews() {
return News;
}
public void setNews(String news) {
News = news;
}
}
MainActivity的编码:
package cn.edu.bzu.list_view1;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends Activity {
private ListView LvFruits;
private List<People> list;
private MyAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setData();
initView();
}
private void initView(){
LvFruits=(ListView)findViewById(R.id.LvFruits);
LvFruits.setAdapter(adapter);
}
private void setData(){
list=new ArrayList<Fruit>();
list.add(new People("kdjfj",R.drawable.p1,"变幻的云朵,悠悠的从我的头上飘过。我重又看见,在童年的幻觉中出现过的神话:骏马拖着的彩车,飘飘欲仙的美女,富丽堂皇的宫殿……我在心突然变得甜蜜"));
list.add(new People("丫丫",R.drawable.p2," 美好的一天。 "));
list.add(new People("dongdong",R.drawable.p3,"变幻的云朵,悠悠的从我的头上飘过。我重又看见,在童年的幻觉中出现过的神话:骏马拖着的彩车,飘飘欲仙的美女,富丽堂皇的宫殿……我在心突然变得甜蜜"));
list.add(new People("xiao",R.drawable.p4,"峡谷上空的阳光是明亮的,甚至是强烈的,但因为峡谷太深,阳光仿佛要走过漫长的时间。"));
list.add(new People("dsd",R.drawable.p5,"春在田畴,松软的泥土散发着清新湿润的气息,冬憩后醒来的麦苗儿精神焕发,展现出一派蓬勃盎然的生机""));
adapter=new MyAdapter(list,MainActivity.this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
二..实现此功能有以下步骤:
1.ListView及ListView_Item
2.实体类的编写
3.自定义适配器的书写
4.ListView的绑定数据源与控件
<编码实现>
自定义适配器MyAdapter
package cn.edu.bzu.list_view1;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class MyAdapter extends BaseAdapter {
private List<People> list;
private Context mContext;
private LayoutInflater mInflater;
//定义构造方法
public MyAdapter(List<People> list, Context mContext) {
super();
this.list = list;
this.mContext = mContext;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder hr=null;
if(convertView==null){
convertView=mInflater.from(mContext).inflate(R.layout.fruit_item,null);
hr=new ViewHolder();
hr.Image=(ImageView)convertView.findViewById(R.id.Ivimage);
hr.Name=(TextView)convertView.findViewById(R.id.tvName);
hr.Contents=(TextView)convertView.findViewById(R.id.tvNews);
convertView.setTag(hr); //设置setTag使得程序得以优化
}else{
hr=(ViewHolder) convertView.getTag();
}
//给控件赋值
hr.Image.setBackgroundResource(list.get(position).getImageId());
hr.Name.setText(list.get(position).getName());
hr.Contents.setText(list.get(position).getNews());
return convertView;
}
class ViewHolder{
ImageView Image;
TextView Name;
TextView Contents;
}
}
实体类People:
package cn.edu.bzu.list_view1;
public class People{
private String name;
private int imageId;
private String News;
public People(String name,int imageId,String News){
super();
this.name=name;
this.imageId=imageId;
this.News=News;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getImageId() {
return imageId;
}
public void setImageId(int imageId) {
this.imageId = imageId;
}
public String getNews() {
return News;
}
public void setNews(String news) {
News = news;
}
}
MainActivity的编码:
package cn.edu.bzu.list_view1;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends Activity {
private ListView LvFruits;
private List<People> list;
private MyAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setData();
initView();
}
private void initView(){
LvFruits=(ListView)findViewById(R.id.LvFruits);
LvFruits.setAdapter(adapter);
}
private void setData(){
list=new ArrayList<Fruit>();
list.add(new People("kdjfj",R.drawable.p1,"变幻的云朵,悠悠的从我的头上飘过。我重又看见,在童年的幻觉中出现过的神话:骏马拖着的彩车,飘飘欲仙的美女,富丽堂皇的宫殿……我在心突然变得甜蜜"));
list.add(new People("丫丫",R.drawable.p2," 美好的一天。 "));
list.add(new People("dongdong",R.drawable.p3,"变幻的云朵,悠悠的从我的头上飘过。我重又看见,在童年的幻觉中出现过的神话:骏马拖着的彩车,飘飘欲仙的美女,富丽堂皇的宫殿……我在心突然变得甜蜜"));
list.add(new People("xiao",R.drawable.p4,"峡谷上空的阳光是明亮的,甚至是强烈的,但因为峡谷太深,阳光仿佛要走过漫长的时间。"));
list.add(new People("dsd",R.drawable.p5,"春在田畴,松软的泥土散发着清新湿润的气息,冬憩后醒来的麦苗儿精神焕发,展现出一派蓬勃盎然的生机""));
adapter=new MyAdapter(list,MainActivity.this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
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