在Activity或Fragment中响应ListView内部按钮的点击事件

在做项目时，遇到点击ListView内部按钮的事件，感觉应在Adapter中写响应事件，但总感觉怪怪的，后来去网上搜索资料，大牛们给出合理的操作：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。除了接口回调之外，也可以使用抽象类回调。

1.接口回调。

Adapter中代码：

package com.net.adapter;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.TextView;

import com.net.R;
import com.net.beans.UserBean;

public class ContactAddAdapter extends BaseAdapter implements OnClickListener{
private List<UserBean> mList;
private Context mContext;
private LayoutInflater mInflater;
private MyClickListener mListener;//所有listview的item共用同一个

//自定义接口，用于回调按钮点击事件到Activity
public interface MyClickListener{
public void clickListener(View v);
}

public ContactAddAdapter(Context context,List<UserBean> userBeansList,MyClickListener listener) {
// TODO Auto-generated constructor stub
mList = userBeansList;
mContext = context;
mInflater = LayoutInflater.from(context);
mListener = listener;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return mList.size();
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return mList.get(position);
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
ViewHolder holder=null ;
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(convertView == null){
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.item_addfriend_listview, null);
holder.tvName = (TextView) convertView.findViewById(R.id.tv_addfriends);
holder.tbAddFriends = (ImageButton) convertView.findViewById(R.id.ib_addfriends);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.tvName.setText(mList.get(position).userName);

holder.tbAddFriends.setOnClickListener(this);
holder.tbAddFriends.setTag(position);//不设置setTag会导致空指针异常
return convertView;
}
class ViewHolder{
public TextView tvName;
public ImageButton tbAddFriends;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
mListener.clickListener(v);

}

}
Activity中代码：
public class ContactAddPage extends Fragment implements MyClickListener{
final static String SERVICE_NS = "http://test.org/";
final static String SERVICE_URL = "http://192.168.56.1:8080/WebService2.asmx?WSDL";
private View view;
private ListView mListView;
private String name,friendname;
List<UserBean> userBeansList = new ArrayList<UserBean>();
private Handler handler;

public View onCreateView(LayoutInflater inflater,
@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
view=inflater.inflate(R.layout.contact_addfriend, null);

new NewsAsyncTask().execute(SERVICE_URL);

initView();

handler = new Handler(){
public void handleMessage(Message msg){
if(msg.what == X0){
Toast.makeText(getActivity(), "添加失败", Toast.LENGTH_SHORT).show();
}
else if(msg.what == X1){
Toast.makeText(getActivity(), "添加好友成功", Toast.LENGTH_SHORT).show();
}

}
};
return view;
}

private void initView() {
// TODO Auto-generated method stub
mListView = (ListView) view.findViewById(R.id.list_friend);
}
/**
* 实现网络的异步访问
* @author Administrator
*
*/
class NewsAsyncTask extends AsyncTask<String, Void, List<UserBean>>{

@Override
protected List<UserBean> doInBackground(String... param) {
return getData(param[0]);
}
protected void onPostExecute(List<UserBean> result) {
super.onPostExecute(result);

ContactAddAdapter adapter = new ContactAddAdapter(getActivity(),userBeansList, ContactAddPage.this);//Fragment中，Activity中第一个可以用this
mListView.setAdapter(adapter);
}
}
/**
* 将URL对应的json格式数据转化为我们封装的Bean对象
* @param url
* @return
*/
private List<UserBean> getData(String url) {
String methodName = "Friend";
final HttpTransportSE ht = new HttpTransportSE(url);
final SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
//实例化
SoapObject soapObject = new SoapObject(SERVICE_NS, methodName);
//设置调用方法的参数值
soapObject.addPropertyIfValue("user", name);
envelope.bodyOut = soapObject;
// c#写的应用程序必须加上这句
envelope.dotNet = true;
try {
System.out.println("start soap");
ht.call(null, envelope);
System.out.println("start call");
if (envelope.getResponse()!=null) {
SoapObject result = (SoapObject)envelope.bodyIn;
SoapObject detail = (SoapObject) result.getProperty(0);
int count = detail.getPropertyCount();
System.out.println("count="+count);
UserBean mBeans=null;
for (int i = 0; i < count; i++) {
mBeans= new UserBean();
mBeans.userName=detail.getProperty(i).toString();

System.out.println(mBeans.userName);
userBeansList.add(mBeans);
}

}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return userBeansList;
}
/**
* 接口方法，响应ListView按钮点击事件
*/
@Override
public void clickListener(View v) {
// TODO Auto-generated method stub
Toast.makeText(
getActivity(),"listview的内部的按钮被点击了！，位置是：" + (Integer) v.getTag() + ",内容是-->"+ userBeansList.get((Integer) v.getTag()).userName,
Toast.LENGTH_SHORT).show();

}
}
2.使用抽象类回调
Adapter代码：


package com.ivan.adapter;

import java.util.List;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;

import com.ivan.listvieweventabstract.R;

public class ContentAdapter extends BaseAdapter {

private static final String TAG = "ContentAdapter";
private List<String> mContentList;
private LayoutInflater mInflater;
private MyClickListener mListener;

public ContentAdapter(Context context, List<String> contentList,
MyClickListener listener) {
mContentList = contentList;
mInflater = LayoutInflater.from(context);
mListener = listener;
}

@Override
public int getCount() {
Log.i(TAG, "getCount");
return mContentList.size();
}

@Override
public Object getItem(int position) {
Log.i(TAG, "getItem");
return mContentList.get(position);
}

@Override
public long getItemId(int position) {
Log.i(TAG, "getItemId");
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
Log.i(TAG, "getView");
ViewHolder holder = null;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item, null);
holder = new ViewHolder();
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);
return convertView;
}

public class ViewHolder {
public TextView textView;
public Button button;
}

/**
* 用于回调的抽象类
* @author Ivan Xu
* 2014-11-26
*/
public static abstract class MyClickListener implements OnClickListener {
/**
* 基类的onClick方法
*/
@Override
public void onClick(View v) {
myOnClick((Integer) v.getTag(), v);
}
public abstract void myOnClick(int position, View v);
}
}

Activity代码：
package com.ivan.listvieweventdemo;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

import com.ivan.adapter.ContentAdapter;
import com.ivan.adapter.ContentAdapter.MyClickListener;
import com.ivan.listvieweventabstract.R;

public class MainActivity extends Activity implements OnItemClickListener {

// 模拟listview中加载的数据
private static final String[] CONTENTS = { "北京", "上海", "广州", "深圳", "苏州",
"南京", "武汉", "长沙", "杭州" };
private List<String> contentList;
private ListView mListView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

init();
}

private void init() {
mListView = (ListView) findViewById(R.id.listview);
contentList = new ArrayList<String>();
for (int i = 0; i < CONTENTS.length; i++) {
contentList.add(CONTENTS[i]);
}
//实例化ContentAdapter类，并传入实现类
mListView.setAdapter(new ContentAdapter(this, contentList, mListener));

mListView.setOnItemClickListener(this);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

//响应item点击事件
@Override
public void onItemClick(AdapterView<?> arg0, View v, int position, long id) {
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
*/
private MyClickListener mListener = new MyClickListener() {
@Override
public void myOnClick(int position, View v) {
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();
}
};
}