Android ListView万能适配器实例代码

概述ListView是开发中最常用的控件了，但是总是会写重复的代码，浪费时间又没有意义。

ListVIEw是开发中最常用的控件了，但是总是会写重复的代码，浪费时间又没有意义。

最近参考一些资料，发现一个万能ListVIEw适配器，代码量少，节省时间，总结一下分享给大家。

首先有一个自定义的Adapter继承于BaseAdapter，下面是自定义的Adapter，精华在getVIEw()方法中

package com.example.myListvIEw.util;import java.util.List;import androID.content.Context;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.BaseAdapter;public abstract class CommonAdapter<T> extends BaseAdapter { /**  * 上下文  */ private Context mContext; /**  * 实体类集合  */ private List<T> mDatas; private LayoutInflater mInflater; /**  * 控件ID  */ private int mlayoutID; public CommonAdapter(Context context,List<T> datas,int layoutID) {  this.mContext = context;  this.mDatas = datas;  this.mlayoutID = layoutID;  mInflater = LayoutInflater.from(context); } @OverrIDe public int getCount() {  // Todo auto-generated method stub  return mDatas.size(); } @OverrIDe public T getItem(int arg0) {  // Todo auto-generated method stub  return mDatas.get(arg0); } @OverrIDe public long getItemID(int arg0) {  // Todo auto-generated method stub  return arg0; } @OverrIDe public VIEw getVIEw(int arg0,VIEw arg1,VIEwGroup arg2) {  // Todo auto-generated method stub  VIEwHolder holder = VIEwHolder.get(mContext,arg1,arg2,mlayoutID,arg0);  convert(holder,getItem(arg0));  return holder.getConvertVIEw(); } public abstract voID convert(VIEwHolder holder,T t);}

以上的抽象方法convert(VIEwHolder holder,T t)；就相当于以前通用代码中的

vIEwHolder.mTextVIEw = (TextVIEw) convertVIEw .findVIEwByID(R.ID.ID_tv_Title);

vIEwHolder.mTextVIEw.setText(Bean.getname());

找到控件的ID再去设施setText等重复的代码方法中的参数VIEwHolder holder,T t    holder就相当于以前通用代码中的vIEwHolder，t就相当于一个自己定义的实体类Bean。

以上代码中getVIEw()方法中有一个VIEwHolder是需要自己声明的，以下是代码以及详细注释：

package com.example.myListvIEw.util;import androID.content.Context;import androID.graphics.Bitmap;import androID.renderscript.Type;import androID.util.SparseArray;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.ImageVIEw;import androID.Widget.TextVIEw;public class VIEwHolder { /**  * SparseArray类存放VIEw集合  */ private SparseArray<VIEw> mVIEws; /**  *   */ private int mposition; /**  * 布局文件  */ private VIEw mConvertVIEw; public VIEw getConvertVIEw() {  return mConvertVIEw; } public VIEwHolder(Context context,VIEwGroup parent,int layoutID,int position) {  this.mVIEws = new SparseArray<VIEw>();  this.mposition = position;  this.mConvertVIEw = LayoutInflater.from(context).inflate(layoutID,parent,false);  this.mConvertVIEw.setTag(this); } /**  * 拿到一个VIEwHolder对象  * @param context  * @param convertVIEw  * @param parent  * @param layoutID  * @param position  * @return  */ public static VIEwHolder get(Context context,VIEw convertVIEw,int position) {  if (null == convertVIEw) {   return new VIEwHolder(context,layoutID,position);  } else {   VIEwHolder holder = (VIEwHolder) convertVIEw.getTag();   holder.mposition = position;   return holder;  } } /**  * 通过控件的ID获取对应的控件，如果没有则加入vIEws  * @param vIEwID  * @return  */ public <T extends VIEw> T getVIEw(int vIEwID) {  VIEw vIEw = mVIEws.get(vIEwID);  if (null == vIEw) {   vIEw = mConvertVIEw.findVIEwByID(vIEwID);   mVIEws.put(vIEwID,vIEw);  }  return (T) vIEw; } /**  * 为TextVIEw设置字符串   * @param vIEwID  * @param text  * @return  */ public VIEwHolder setText(int vIEwID,String text) {  TextVIEw tv = getVIEw(vIEwID);  tv.setText(text);  return this; } /**   * 为ImageVIEw设置图片   *   * @param vIEwID   * @param drawableID   * @return   */  public VIEwHolder setimageResource(int vIEwID,int drawableID)  {   ImageVIEw vIEw = getVIEw(vIEwID);   vIEw.setimageResource(drawableID);   return this;  }    public int getposition()  {   return mposition;  } }

再写一个Adapter继承于万能适配器CommonAdapter，还是要写一个自己的Adapter,因为一个项目可能会有多个ListVIEw，但是每个的item元素，布局都会有所不同的，这个泪用来区分不同的ListVIEw与自己所对应的item.这个代码量较少完全可以写成内部类在Activity.java中.

package com.example.myListvIEw.adapter;import java.util.List;import androID.content.Context;import androID.vIEw.VIEw;import androID.vIEw.VIEw.OnClickListener;import androID.Widget.CheckBox;import com.example.myListvIEw.R;import com.example.myListvIEw.domain.Bean;import com.example.myListvIEw.util.CommonAdapter;import com.example.myListvIEw.util.VIEwHolder;public class MyAdapter extends CommonAdapter<Bean> { public MyAdapter(Context context,List<Bean> datas,int layoutID) {  super(context,datas,layoutID);  // Todo auto-generated constructor stub } @OverrIDe public voID convert(VIEwHolder holder,final Bean bean) {  // Todo auto-generated method stub  holder.setText(R.ID.tv_Title,bean.getTitle())    .setText(R.ID.tv_desc,bean.getDesc())    .setText(R.ID.tv_time,bean.getTime())    .setText(R.ID.tv_phone,bean.getPhone());  /**   * 防止CheckBox混乱   */  final CheckBox cBox = (CheckBox)(holder.getVIEw(R.ID.cb));  if (cBox != null)  {   cBox.setChecked(bean.isChecked());   cBox.setonClickListener(new OnClickListener()   {    @OverrIDe    public voID onClick(VIEw v)    {     bean.setChecked(cBox.isChecked());    }   });  } }}

优化之后用适配器的时候就简单多了下面是实体类,item和MainActivity.java中的代码：

实体类：

package com.example.myListvIEw.domain;public class Bean { private String Title; private String desc; private String time; private String phone; private boolean isChecked; public boolean isChecked() {  return isChecked; } public voID setChecked(boolean isChecked) {  this.isChecked = isChecked; } /**  * @param Title  * @param desc  * @param time  * @param phone  */ public Bean(String Title,String desc,String time,String phone) {  this.Title = Title;  this.desc = desc;  this.time = time;  this.phone = phone; } public String getTitle() {  return Title; } public voID setTitle(String Title) {  this.Title = Title; } public String getDesc() {  return desc; } public voID setDesc(String desc) {  this.desc = desc; } public String getTime() {  return time; } public voID setTime(String time) {  this.time = time; } public String getPhone() {  return phone; } public voID setPhone(String phone) {  this.phone = phone; }}

MainActivity.java：

重点代码：

参数有上下文，集合，和自己对应的item就可以了
 adapter = new MyAdapter(this,mDatas,R.layout.item);

package com.example.myListvIEw.ui;import java.util.ArrayList;import java.util.List;import androID.app.Activity;import androID.content.Intent;import androID.os.Bundle;import androID.vIEw.VIEw;import androID.Widget.AdapterVIEw;import androID.Widget.AdapterVIEw.OnItemClickListener;import androID.Widget.ListVIEw;import com.example.myListvIEw.R;import com.example.myListvIEw.adapter.MyAdapter;import com.example.myListvIEw.domain.Bean;public class MainActivity extends Activity { private ListVIEw ListVIEw; private List<Bean> mDatas; /**  * 适配器  */ private MyAdapter adapter; @OverrIDe protected voID onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentVIEw(R.layout.activity_main);  initVIEw();  initData();  Listener(); } private voID Listener() {  // Todo auto-generated method stub  ListVIEw.setonItemClickListener(new OnItemClickListener() {   @OverrIDe   public voID onItemClick(AdapterVIEw<?> arg0,int arg2,long arg3) {    // Todo auto-generated method stub    startActivity(new Intent(MainActivity.this,SecondActivity.class));   }  }); } private voID initData() {  // Todo auto-generated method stub  mDatas = new ArrayList<Bean>();  Bean bean = new Bean("AndroID新技能 Get","AndroID-打造万能的ListVIEw和GrIDVIEw适配器","2015-08-05","10086");  mDatas.add(bean);  bean = new Bean("捡到权志龙一个","在星巴克捡到权志龙一个","2015-08-06","10086");  mDatas.add(bean);  bean = new Bean("Gettop一个","在韩国首尔捡到top一个","2015-08-07","10086");  mDatas.add(bean);   adapter = new MyAdapter(this,R.layout.item);  ListVIEw.setAdapter(adapter);   } private voID initVIEw() {  // Todo auto-generated method stub  ListVIEw = (ListVIEw) findVIEwByID(R.ID.ListVIEw); }}

item布局：

<?xml version="1.0" enCoding="utf-8"?><relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:padding="10dp" > <CheckBox  androID:focusable="false"  androID:ID="@+ID/cb"  androID:layout_wIDth="wrap_content"  androID:layout_height="wrap_content"  androID:layout_alignParentRight="true"  androID:layout_centerInParent="true" /> <TextVIEw  androID:ID="@+ID/tv_Title"  androID:layout_wIDth="wrap_content"  androID:layout_height="wrap_content"  androID:layout_margintop="10dp"  androID:singleline="true"  androID:text="AndroID新技能 Get" /> <TextVIEw  androID:ID="@+ID/tv_desc"  androID:layout_wIDth="match_parent"  androID:layout_height="wrap_content"  androID:layout_below="@ID/tv_Title"  androID:layout_margintop="10dp"  androID:layout_toleftOf="@ID/cb"  androID:maxlines="2"  androID:text="AndroID-打造万能的ListVIEw和GrIDVIEw适配器"  androID:textcolor="#898989" /> <TextVIEw  androID:ID="@+ID/tv_time"  androID:layout_wIDth="wrap_content"  androID:layout_height="wrap_content"  androID:layout_below="@ID/tv_desc"  androID:layout_margintop="10dp"  androID:text="2015-08-05"  androID:textcolor="#898989"  androID:textSize="12sp" /> <TextVIEw  androID:ID="@+ID/tv_phone"  androID:layout_wIDth="wrap_content"  androID:layout_height="wrap_content"  androID:layout_alignParentRight="true"  androID:layout_below="@ID/tv_desc"  androID:layout_margintop="10dp"  androID:background="#20793D"  androID:maxlines="1"  androID:text="10086"  androID:padding="4dp"  androID:textcolor="#FFF" /></relativeLayout>

效果图：

用这个去适配另一个不同的布局：

新布局的Adapter一样继承自己的万能adapter:CommonAdapter

package com.example.myListvIEw.adapter;import java.util.List;import java.util.Map;import androID.content.Context;import com.example.myListvIEw.R;import com.example.myListvIEw.util.CommonAdapter;import com.example.myListvIEw.util.VIEwHolder;public class SecondAdapter extends CommonAdapter<Map<String,String>> { public SecondAdapter(Context context,List<Map<String,String>> datas,Map<String,String> t) {  // Todo auto-generated method stub  holder.setText(R.ID.tv_item2values,t.get("values")); }}

Activity.java代码：

package com.example.myListvIEw.ui;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import androID.app.Activity;import androID.os.Bundle;import androID.Widget.ListVIEw;import com.example.myListvIEw.R;import com.example.myListvIEw.adapter.MyAdapter;import com.example.myListvIEw.adapter.SecondAdapter;public class SecondActivity extends Activity { private ListVIEw ListVIEw_second; private SecondAdapter secondAdapter; private List<Map<String,String>> Lists = new ArrayList<Map<String,String>>(); @OverrIDe protected voID onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentVIEw(R.layout.activity_second);  initVIEw();  initData(); } private voID initData() {  // Todo auto-generated method stub  for (int i = 0; i < 4; i++) {   Map map = new HashMap<String,String>();   map.put("values","条目" + i);   Lists.add(map);  }  secondAdapter = new SecondAdapter(this,Lists,R.layout.item2);  ListVIEw_second.setAdapter(secondAdapter); } private voID initVIEw() {  // Todo auto-generated method stub  ListVIEw_second = (ListVIEw) findVIEwByID(R.ID.ListVIEw_second); }}

item：

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID" androID:layout_wIDth="match_parent" androID:layout_height="match_parent" androID:orIEntation="horizontal" >  <TextVIEw  androID:ID="@+ID/tv_item2values"  androID:layout_wIDth="wrap_content"  androID:layout_height="wrap_content"  androID:layout_gravity="center"  androID:text="ffffff"  androID:layout_margin="16dp"  androID:gravity="center" /></linearLayout>

效果图：

以上就是对AndroID ListVIEw 的资料整理，希望能给大家带来帮助！

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