Android ListView 点击，求大神帮助 ?

使用接口回调和使用抽象类回调。

正好可以复习一下接口和抽象类的区别，于是写了两个Demo：

1.使用接口回调：

Adapter类

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1packagecom.ivan.adapter;
2
3importjava.util.List;
4
5importandroid.content.Context;
6importandroid.util.Log;
7importandroid.view.LayoutInflater;
8importandroid.view.View;
9importandroid.view.View.OnClickListener;
10importandroid.view.ViewGroup;
11importandroid.widget.BaseAdapter;
12importandroid.widget.Button;
13importandroid.widget.TextView;
14
15importcom.ivan.listvieweventcallback.R;
16
17publicclassContentAdapterextendsBaseAdapterimplementsOnClickListener{
18
19privatestaticfinalStringTAG="ContentAdapter";
20privateListmContentList;
21privateLayoutInflatermInflater;
22privateCallbackmCallback;
23
24/**
25*自定义接口，用于回调按钮点击事件到Activity
26*@authorIvanXu
27*2014-11-26
28*/
29publicinterfaceCallback{
30publicvoidclick(Viewv);
31}
32
33publicContentAdapter(Contextcontext,ListcontentList,
34Callbackcallback){
35mContentList=contentList;
36mInflater=LayoutInflater.from(context);
37mCallback=callback;
38}
39
40@Override
41publicintgetCount(){
42Log.i(TAG,"getCount");
43returnmContentList.size();
44}
45
46@Override
47publicObjectgetItem(intposition){
48Log.i(TAG,"getItem");
49returnmContentList.get(position);
50}
51
52@Override
53publiclonggetItemId(intposition){
54Log.i(TAG,"getItemId");
55returnposition;
56}
57
58@Override
59publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
60Log.i(TAG,"getView");
61ViewHolderholder=null;
62if(convertView==null){
63convertView=mInflater.inflate(R.layout.list_item,null);
64holder=newViewHolder();
65holder.textView=(TextView)convertView
66.findViewById(R.id.textView1);
67holder.button=(Button)convertView.findViewById(R.id.button1);
68convertView.setTag(holder);
69}else{
70holder=(ViewHolder)convertView.getTag();
71}
72holder.textView.setText(mContentList.get(position));
73
74

75holder.button.setOnClickListener(this);
76holder.button.setTag(position);
77returnconvertView;
78}
79
80publicclassViewHolder{
81publicTextViewtextView;
82publicButtonbutton;
83}
84
85//响应按钮点击事件,调用子定义接口，并传入View
86@Override
87publicvoidonClick(Viewv){
88mCallback.click(v);
89}
90}
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Activity类：

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1packagecom.ivan.listvieweventdemo;
2
3importjava.util.ArrayList;
4importjava.util.List;
5
6importandroid.app.Activity;
7importandroid.os.Bundle;
8importandroid.view.Menu;
9importandroid.view.View;
10importandroid.widget.AdapterView;
11importandroid.widget.AdapterView.OnItemClickListener;
12importandroid.widget.ListView;
13importandroid.widget.Toast;
14
15importcom.ivan.adapter.ContentAdapter;
16importcom.ivan.adapter.ContentAdapter.Callback;
17importcom.ivan.listvieweventcallback.R;
18//MainActivity需要实现自定义接口
19publicclassMainActivityextendsActivityimplementsOnItemClickListener,
20Callback{
21
22//模拟listview中加载的数据
23privatestaticfinalString[]CONTENTS={"北京","上海","广州","深圳","苏州",
24"南京","武汉","长沙","杭州"};
25privateListcontentList;
26privateListViewmListView;
27
28@Override
29protectedvoidonCreate(BundlesavedInstanceState){
30super.onCreate(savedInstanceState);
31setContentView(R.layout.activity_main);
32
33init();
34}
35
36privatevoidinit(){
37mListView=(ListView)findViewById(R.id.listview);
38contentList=newArrayList();
39for(inti=0;i<CONTENTS.length;i++){
40contentList.add(CONTENTS[i]);
41}
42//
43mListView.setAdapter(newContentAdapter(this,contentList,this));
44mListView.setOnItemClickListener(this);
45}
46
47@Override
48publicbooleanonCreateOptionsMenu(Menumenu){
49getMenuInflater().inflate(R.menu.main,menu);
50returntrue;
51}
52
53/**
54*响应ListView中item的点击事件
55/
56@Override
57publicvoidonItemClick(AdapterView<?>arg0,Viewv,intposition,longid){
58Toast.makeText(this,"listview的item被点击了！，点击的位置是-->"+position,
59Toast.LENGTH_SHORT).show();
60}
61
62/*
63*接口方法，响应ListView按钮点击事件
64*/
65@Override
66publicvoidclick(Viewv){
67Toast.makeText(
68MainActivity.this,
69"listview的内部的按钮被点击了！，位置是-->"+(Integer)v.getTag()+",内容是-->"
70+contentList.get((Integer)v.getTag()),
71Toast.LENGTH_SHORT).show();
72}
73}
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2.使用抽象类回调

Adapter类：

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1packagecom.ivan.adapter;
2
3importjava.util.List;
4
5importandroid.content.Context;
6importandroid.util.Log;
7importandroid.view.LayoutInflater;
8importandroid.view.View;
9importandroid.view.View.OnClickListener;
10importandroid.view.ViewGroup;
11importandroid.widget.BaseAdapter;
12importandroid.widget.Button;
13importandroid.widget.TextView;
14
15importcom.ivan.listvieweventabstract.R;
16
17publicclassContentAdapterextendsBaseAdapter{
18
19privatestaticfinalStringTAG="ContentAdapter";
20privateListmContentList;
21privateLayoutInflatermInflater;
22privateMyClickListenermListener;
23
24publicContentAdapter(Contextcontext,ListcontentList,
25MyClickListenerlistener){
26mContentList=contentList;
27mInflater=LayoutInflater.from(context);
28mListener=listener;
29}
30
31@Override
32publicintgetCount(){
33Log.i(TAG,"getCount");
34returnmContentList.size();
35}
36
37@Override
38publicObjectgetItem(intposition){
39Log.i(TAG,"getItem");
40returnmContentList.get(position);
41}
42
43@Override
44publiclonggetItemId(intposition){
45Log.i(TAG,"getItemId");
46returnposition;
47}
48
49@Override
50publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
51Log.i(TAG,"getView");
52ViewHolderholder=null;
53if(convertView==null){
54convertView=mInflater.inflate(R.layout.list_item,null);
55holder=newViewHolder();
56holder.textView=(TextView)convertView
57.findViewById(R.id.textView1);
58holder.button=(Button)convertView.findViewById(R.id.button1);
59convertView.setTag(holder);
60}else{
61holder=(ViewHolder)convertView.getTag();
62}
63holder.textView.setText(mContentList.get(position));
64holder.button.setOnClickListener(mListener);
65holder.button.setTag(position);
66returnconvertView;
67}
68
69publicclassViewHolder{
70publicTextViewtextView;
71publicButtonbutton;
72}
73
74/**
75*用于回调的抽象类
76*@authorIvanXu
77*2014-11-26
78/
79publicstaticabstractclassMyClickListenerimplementsOnClickListener{
80/*
81*基类的onClick方法
82*/
83@Override
84publicvoidonClick(Viewv){
85myOnClick((Integer)v.getTag(),v);
86}
87publicabstractvoidmyOnClick(intposition,Viewv);
88}
89}
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Activity类：

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1packagecom.ivan.listvieweventdemo;
2
3importjava.util.ArrayList;
4importjava.util.List;
5
6importandroid.app.Activity;
7importandroid.os.Bundle;
8importandroid.view.Menu;
9importandroid.view.View;
10importandroid.widget.AdapterView;
11importandroid.widget.AdapterView.OnItemClickListener;
12importandroid.widget.ListView;
13importandroid.widget.Toast;
14
15importcom.ivan.adapter.ContentAdapter;
16importcom.ivan.adapter.ContentAdapter.MyClickListener;
17importcom.ivan.listvieweventabstract.R;
18
19publicclassMainActivityextendsActivityimplementsOnItemClickListener{
20
21//模拟listview中加载的数据
22privatestaticfinalString[]CONTENTS={"北京","上海","广州","深圳","苏州",
23"南京","武汉","长沙","杭州"};
24privateListcontentList;
25privateListViewmListView;
26
27@Override
28protectedvoidonCreate(BundlesavedInstanceState){
29super.onCreate(savedInstanceState);
30setContentView(R.layout.activity_main);
31
32init();
33}
34
35privatevoidinit(){
36mListView=(ListView)findViewById(R.id.listview);
37contentList=newArrayList();
38for(inti=0;i<CONTENTS.length;i++){
39contentList.add(CONTENTS[i]);
40}
41//实例化ContentAdapter类，并传入实现类
42mListView.setAdapter(newContentAdapter(this,contentList,mListener));
43

44mListView.setOnItemClickListener(this);
45}
46
47@Override
48publicbooleanonCreateOptionsMenu(Menumenu){
49getMenuInflater().inflate(R.menu.main,menu);
50returntrue;
51}
52
53//响应item点击事件
54@Override
55publicvoidonItemClick(AdapterView<?>arg0,Viewv,intposition,longid){
56Toast.makeText(this,"listview的item被点击了！，点击的位置是-->"+position,
57Toast.LENGTH_SHORT).show();
58}
59
60/**
61*实现类，响应按钮点击事件
62*/
63privateMyClickListenermListener=newMyClickListener(){
64@Override
65publicvoidmyOnClick(intposition,Viewv){
66Toast.makeText(
67MainActivity.this,
68"listview的内部的按钮被点击了！，位置是-->"+position+",内容是-->"
69+contentList.get(position),Toast.LENGTH_SHORT)
70.show();
71}
72};
73}
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以下是布局文件

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12xmlns:tools="http://schemas.android.com/tools"
3android:layout_width="match_parent"
4android:layout_height="match_parent"
5android:paddingBottom="@dimen/activity_vertical_margin"
6android:paddingLeft="@dimen/activity_horizontal_margin"
7android:paddingRight="@dimen/activity_horizontal_margin"
8android:paddingTop="@dimen/activity_vertical_margin"
9tools:context=".MainActivity">
10
1112android:id="@+id/listview"
13android:layout_width="match_parent"
14android:layout_height="match_parent">
15
16
17
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<?xmlversion="1.0"encoding="utf-8"?>
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:descendantFocusability="blocksDescendants"
android:orientation="vertical">

<TextViewandroid:id="@+id/textView1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="content"android:textColor="#ff0000"android:textSize="20sp"/><Buttonandroid:id="@+id/button1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:focusable="false"android:text="Button"android:textColor="#ff0000"android:textSize="20sp"/>

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两种方式的区别在于，抽象类在Activity中实现的时候，只能定义一个成员变量来实现，不能由Activity直接实现，因为Java不支持多继承。而接口既可以由Activity直接实现，也可以由其成员变量来实现。