为ListView每个Item上面的按钮添加事件在Adapter中响应

1.使用final变量扩展局部变量的生命周期范围主要代码

//注意原本getView方法中的int position变量是非final的，现在改为final
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {

holder=new ViewHolder();

//可以理解为从vlist获取view  之后把view返回给ListView
convertView = mInflater.inflate(R.layout.vlist, null);
holder.title = (TextView)convertView.findViewById(R.id.title);
holder.info = (TextView)convertView.findViewById(R.id.info);
holder.viewBtn = (Button)convertView.findViewById(R.id.view_btn);
convertView.setTag(holder);
}else {
holder = (ViewHolder)convertView.getTag();
}

holder.title.setText((String)mData.get(position).get("title"));
holder.info.setText((String)mData.get(position).get("info"));
holder.viewBtn.setTag(position);
//给Button添加单击事件  添加Button之后ListView将失去焦点  需要的直接把Button的焦点去掉
holder.viewBtn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
showInfo(position);
}
});

//holder.viewBtn.setOnClickListener(MyListener(position));

return convertView;
}
}

//提取出来方便点
public final class ViewHolder {
public TextView title;
public TextView info;
public Button viewBtn;
}
public void showInfo(int position){

ImageView img=new ImageView(ListViewActivity.this);
img.setImageResource(R.drawable.b);
new AlertDialog.Builder(this).setView(img)
.setTitle("详情"+position)
.setMessage("菜名："+title[position]+"   价格:"+info[position])
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.show();
}

2.使用类记录每个Button的位置，使每个BUTTON都有自己的Listener主要代码：

//****************************************第二种方法，高手一般都用此种方法,具体原因，我还不清楚,有待研究

public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
MyListener myListener=null;
if (convertView == null) {

holder=new ViewHolder();

//可以理解为从vlist获取view  之后把view返回给ListView
myListener=new MyListener(position);

convertView = mInflater.inflate(R.layout.vlist, null);
holder.title = (TextView)convertView.findViewById(R.id.title);
holder.info = (TextView)convertView.findViewById(R.id.info);
holder.viewBtn = (Button)convertView.findViewById(R.id.view_btn);
convertView.setTag(holder);
}else {
holder = (ViewHolder)convertView.getTag();
}

holder.title.setText((String)mData.get(position).get("title"));
holder.info.setText((String)mData.get(position).get("info"));
holder.viewBtn.setTag(position);
//给Button添加单击事件  添加Button之后ListView将失去焦点  需要的直接把Button的焦点去掉
holder.viewBtn.setOnClickListener( myListener);

//holder.viewBtn.setOnClickListener(MyListener(position));

return convertView;
}
}

private class MyListener implements OnClickListener{
int mPosition;
public MyListener(int inPosition){
mPosition= inPosition;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(ListViewActivity.this, title[mPosition], Toast.LENGTH_SHORT).show();
}

}

//提取出来方便点
public final class ViewHolder {
public TextView title;
public TextView info;
public Button viewBtn;
}