android中在Activity中响应ListView内部按钮的点击事件的两种方法
最近交流群里面有人问到一个问题：如何在Activity中响应ListView内部按钮的点击事件，不要在Adapter中响应？
对于这个问题，我最初给他的解答是，在Adapter中定义一个回调接口，在Activity中实现该接口，从而实现对点击事件的响应。
下班后思考了一下，觉得有两种方式都能比较好的实现：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
packagecom.ivan.adapter;
importjava.util.List;
importandroid.content.Context;
importandroid.util.Log;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.view.ViewGroup;
importandroid.widget.BaseAdapter;
importandroid.widget.Button;
importandroid.widget.TextView;
importcom.ivan.listvieweventcallback.R;
publicclassContentAdapterextendsBaseAdapterimplementsOnClickListener{
privatestaticfinalStringTAG="ContentAdapter";
privateList<String>mContentList;
privateLayoutInflatermInflater;
privateCallbackmCallback;
/**
*自定义接口，用于回调按钮点击事件到Activity
*@authorIvanXu
*2014-11-26
*/
publicinterfaceCallback{
publicvoidclick(Viewv);
}
publicContentAdapter(Contextcontext,List<String>contentList,
Callbackcallback){
mContentList=contentList;
mInflater=LayoutInflater.from(context);
mCallback=callback;
}
@Override
publicintgetCount(){
Log.i(TAG,"getCount");
returnmContentList.size();
}
@Override
publicObjectgetItem(intposition){
Log.i(TAG,"getItem");
returnmContentList.get(position);
}
@Override
publiclonggetItemId(intposition){
Log.i(TAG,"getItemId");
returnposition;
}
@Override
publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
Log.i(TAG,"getView");
ViewHolderholder=null;
if(convertView==null){
convertView=mInflater.inflate(R.layout.list_item,null);
holder=newViewHolder();
holder.textView=(TextView)convertView
.findViewById(R.id.textView1);
holder.button=(Button)convertView.findViewById(R.id.button1);
convertView.setTag(holder);
}else{
holder=(ViewHolder)convertView.getTag();
}
holder.textView.setText(mContentList.get(position));
holder.button.setOnClickListener(this);
holder.button.setTag(position);
returnconvertView;
}
publicclassViewHolder{
publicTextViewtextView;
publicButtonbutton;
}
//响应按钮点击事件,调用子定义接口，并传入View
@Override
publicvoidonClick(Viewv){
mCallback.click(v);
}
}
Activity类：
packagecom.ivan.listvieweventdemo;
importjava.util.ArrayList;
importjava.util.List;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.view.Menu;
importandroid.view.View;
importandroid.widget.AdapterView;
importandroid.widget.AdapterView.OnItemClickListener;
importandroid.widget.ListView;
importandroid.widget.Toast;
importcom.ivan.adapter.ContentAdapter;
importcom.ivan.adapter.ContentAdapter.Callback;
importcom.ivan.listvieweventcallback.R;
//MainActivity需要实现自定义接口
publicclassMainActivityextendsActivityimplementsOnItemClickListener,
Callback{
//模拟listview中加载的数据
privatestaticfinalString[]CONTENTS={"北京","上海","广州","深圳","苏州",
"南京","武汉","长沙","杭州"};
privateList<String>contentList;
privateListViewmListView;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
privatevoidinit(){
mListView=(ListView)findViewById(R.id.listview);
contentList=newArrayList<String>();
for(inti=0;i<CONTENTS.length;i++){
contentList.add(CONTENTS[i]);
}
//
mListView.setAdapter(newContentAdapter(this,contentList,this));
mListView.setOnItemClickListener(this);
}
@Override
publicbooleanonCreateOptionsMenu(Menumenu){
getMenuInflater().inflate(R.menu.main,menu);
returntrue;
}
/**
*响应ListView中item的点击事件
*/
@Override
publicvoidonItemClick(AdapterView<?>arg0,Viewv,intposition,longid){
Toast.makeText(this,"listview的item被点击了！，点击的位置是-->"+position,
Toast.LENGTH_SHORT).show();
}
/**
*接口方法，响应ListView按钮点击事件
*/
@Override
publicvoidclick(Viewv){
Toast.makeText(
MainActivity.this,
"listview的内部的按钮被点击了！，位置是-->"+(Integer)v.getTag()+",内容是-->"
+contentList.get((Integer)v.getTag()),
Toast.LENGTH_SHORT).show();
}
}
2.使用抽象类回调
Adapter类：
packagecom.ivan.adapter;
importjava.util.List;
importandroid.content.Context;
importandroid.util.Log;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.view.ViewGroup;
importandroid.widget.BaseAdapter;
importandroid.widget.Button;
importandroid.widget.TextView;
importcom.ivan.listvieweventabstract.R;
publicclassContentAdapterextendsBaseAdapter{
privatestaticfinalStringTAG="ContentAdapter";
privateList<String>mContentList;
privateLayoutInflatermInflater;
privateMyClickListenermListener;
publicContentAdapter(Contextcontext,List<String>contentList,
MyClickListenerlistener){
mContentList=contentList;
mInflater=LayoutInflater.from(context);
mListener=listener;
}
@Override
publicintgetCount(){
Log.i(TAG,"getCount");
returnmContentList.size();
}
@Override
publicObjectgetItem(intposition){
Log.i(TAG,"getItem");
returnmContentList.get(position);
}
@Override
publiclonggetItemId(intposition){
Log.i(TAG,"getItemId");
returnposition;
}
@Override
publicViewgetView(intposition,ViewconvertView,ViewGroupparent){
Log.i(TAG,"getView");
ViewHolderholder=null;
if(convertView==null){
convertView=mInflater.inflate(R.layout.list_item,null);
holder=newViewHolder();
holder.textView=(TextView)convertView
.findViewById(R.id.textView1);
holder.button=(Button)convertView.findViewById(R.id.button1);
convertView.setTag(holder);
}else{
holder=(ViewHolder)convertView.getTag();
}
holder.textView.setText(mContentList.get(position));
holder.button.setOnClickListener(mListener);
holder.button.setTag(position);
returnconvertView;
}
publicclassViewHolder{
publicTextViewtextView;
publicButtonbutton;
}
/**
*用于回调的抽象类
*@authorIvanXu
*2014-11-26
*/
publicstaticabstractclassMyClickListenerimplementsOnClickListener{
/**
*基类的onClick方法
*/
@Override
publicvoidonClick(Viewv){
myOnClick((Integer)v.getTag(),v);
}
publicabstractvoidmyOnClick(intposition,Viewv);
}
}
Activity类：
packagecom.ivan.listvieweventdemo;
importjava.util.ArrayList;
importjava.util.List;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.view.Menu;
importandroid.view.View;
importandroid.widget.AdapterView;
importandroid.widget.AdapterView.OnItemClickListener;
importandroid.widget.ListView;
importandroid.widget.Toast;
importcom.ivan.adapter.ContentAdapter;
importcom.ivan.adapter.ContentAdapter.MyClickListener;
importcom.ivan.listvieweventabstract.R;
publicclassMainActivityextendsActivityimplementsOnItemClickListener{
//模拟listview中加载的数据
privatestaticfinalString[]CONTENTS={"北京","上海","广州","深圳","苏州",
"南京","武汉","长沙","杭州"};
privateList<String>contentList;
privateListViewmListView;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
privatevoidinit(){
mListView=(ListView)findViewById(R.id.listview);
contentList=newArrayList<String>();
for(inti=0;i<CONTENTS.length;i++){
contentList.add(CONTENTS[i]);
}
//实例化ContentAdapter类，并传入实现类
mListView.setAdapter(newContentAdapter(this,contentList,mListener));
mListView.setOnItemClickListener(this);
}
@Override
publicbooleanonCreateOptionsMenu(Menumenu){
getMenuInflater().inflate(R.menu.main,menu);
returntrue;
}
//响应item点击事件
@Override
publicvoidonItemClick(AdapterView<?>arg0,Viewv,intposition,longid){
Toast.makeText(this,"listview的item被点击了！，点击的位置是-->"+position,
Toast.LENGTH_SHORT).show();
}
/**
*实现类，响应按钮点击事件
*/
privateMyClickListenermListener=newMyClickListener(){
@Override
publicvoidmyOnClick(intposition,Viewv){
Toast.makeText(
MainActivity.this,
"listview的内部的按钮被点击了！，位置是-->"+position+",内容是-->"
+contentList.get(position),Toast.LENGTH_SHORT)
.show();
}
};
}
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。
原文链接：http://blog.csdn.net/u011895534/article/details/50439547
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。