Android ListView最佳处理方式，ListView拖动防重复数据显示，单击响应子控件

Android ListView最佳处理方式，ListView拖动防重复数据显示，单击响应子控件。

1、为了防止拖动ListView时，在列表末尾重复数据显示。需要加入 HashMap lmap = new HashMap();其中Integer为列表位置，View为子项视图，加入数据前首先if (lmap.get(position)==null) ，满足条件时，加入lmap.put(position, convertView);如果条件不满足，convertView = lmap.get(position);

2、监听每个子控件时，一定要加入final int currentPosition=position;这样可以牢牢抓住每次点击的响应位置；最好把控件集成到类中。

package logic;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import logic.PlaceAdapter.ViewHolder;

import org.guiji.BigPictureActivity;
import org.guiji.ClassUserListActivity;
import org.guiji.CommentMoodActivity;
import org.guiji.R;
import org.guiji.UserHomeActivity;

import support.ClassUserListImageDownloadTask;
import support.ImageDownloadTask;
import support.SystemConstant;
import android.content.Context;
import android.content.Intent;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class ClassUserListAdapter extends BaseAdapter {
	HashMap lmap = new HashMap();
	private LayoutInflater mInflater=null;
	private List> mData=null;
	private ClassUserListImageDownloadTask imgtask=null;
	private Context context;
	public List> getmData() {
		return mData;
	}

	public void setmData(List> mData) {
		this.mData = mData;
	}
	public ClassUserListAdapter(Context context){
		this.mInflater = LayoutInflater.from(context);
		this.context=context;
	}
	@Override
	public int getCount() {
		return mData.size();
	}

	@Override
	public Object getItem(int position) {
		return mData.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ClassUserListViewHolder holder = null;
        if (lmap.get(position)==null) {
        	imgtask=new ClassUserListImageDownloadTask();
        	
        	convertView = mInflater.inflate(R.layout.classuserlist_item, null);
            holder=new ClassUserListViewHolder(); 
            
            holder.classuserlist_item_userlogo=(ImageView)convertView.findViewById(R.id.classuserlist_item_userlogo);
            holder.classuserlist_item_username=(TextView)convertView.findViewById(R.id.classuserlist_item_username);
            holder.classuserlist_item_statuscontent=(TextView)convertView.findViewById(R.id.classuserlist_item_statuscontent);
            holder.classuserlist_item_idfans1=(TextView)convertView.findViewById(R.id.classuserlist_item_idfans1);
            holder.classuserlist_item_idfans2=(TextView)convertView.findViewById(R.id.classuserlist_item_idfans2);
            holder.classuserlist_item_idmood=(TextView)convertView.findViewById(R.id.classuserlist_item_idmood);
            holder.classuserlist_item_idhuoyuevalue=(TextView)convertView.findViewById(R.id.classuserlist_item_idhuoyuevalue);
            holder.classuserlist_item_msgpic=(ImageView)convertView.findViewById(R.id.classuserlist_item_msgpic);
            holder.classuserlist_item_msgcontent=(TextView)convertView.findViewById(R.id.classuserlist_item_msgcontent);
            holder.classuserlist_item_idtimeplace=(TextView)convertView.findViewById(R.id.classuserlist_item_idtimeplace);
            holder.classuserlist_item_classbutton=(ImageView)convertView.findViewById(R.id.classuserlist_item_classbutton);
            
            lmap.put(position, convertView);
            convertView.setTag(holder);
            
            holder.classuserlist_item_username.setText((String)mData.get(position).get("username"));
            if(mData.get(position).get("idstatuscontent")!=null){
            	holder.classuserlist_item_statuscontent.setText((String)mData.get(position).get("idstatuscontent"));
            	holder.classuserlist_item_statuscontent.setVisibility(0);
            }
            if(mData.get(position).get("idfans1")!=null){
            	holder.classuserlist_item_idfans1.setText((String)mData.get(position).get("idfans1"));
            	holder.classuserlist_item_idfans1.setVisibility(0);
            }
            if(mData.get(position).get("idfans2")!=null){
            	holder.classuserlist_item_idfans2.setText((String)mData.get(position).get("idfans2"));
            	holder.classuserlist_item_idfans2.setVisibility(0);
            }
            
            holder.classuserlist_item_idmood.setText((String)mData.get(position).get("idmood"));
            if(mData.get(position).get("idhuoyuevalue").length()>=4)
            	holder.classuserlist_item_idhuoyuevalue.setText("活跃值"+"("+mData.get(position).get("idhuoyuevalue").substring(0, 4)+")");
            else
            	holder.classuserlist_item_idhuoyuevalue.setText("活跃值"+"("+mData.get(position).get("idhuoyuevalue")+"0"+")");
            
            if(mData.get(position).get("idmsgcontent")!=null){
            	holder.classuserlist_item_msgcontent.setText((String)mData.get(position).get("idmsgcontent"));
            	holder.classuserlist_item_msgcontent.setVisibility(0);
            }
            if(mData.get(position).get("idtime")!=null){
            	holder.classuserlist_item_idtimeplace.setText((String)mData.get(position).get("idtime")+"  "+(String)mData.get(position).get("idplace"));
            	holder.classuserlist_item_idtimeplace.setVisibility(0);
            }
            
            String temp=SystemConstant.baseURLNone+mData.get(position).get("userlogo")+","+
    		SystemConstant.baseURLNone+mData.get(position).get("idmsgpic");
            imgtask.execute(temp,holder);
            
        }else {
        	convertView = lmap.get(position);
            holder = (ClassUserListViewHolder)convertView.getTag();
        }
		
        final int currentPosition=position;
        holder.classuserlist_item_userlogo.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				MainService.guiji.setCurrentURL(SystemConstant.baseURL+mData.get(currentPosition).get("userLink"));
				Intent it=new Intent(context,UserHomeActivity.class);
				context.startActivity(it);
			}
		});
		
        holder.classuserlist_item_username.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				MainService.guiji.setCurrentURL(SystemConstant.baseURL+mData.get(currentPosition).get("userLink"));
				Intent it=new Intent(context,UserHomeActivity.class);
				context.startActivity(it);
			}
		});
        holder.classuserlist_item_msgpic.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				MainService.guiji.setCurrentURL(SystemConstant.baseURLNone+mData.get(currentPosition).get("idmsgpic"));
				Intent it=new Intent(context,BigPictureActivity.class);
				context.startActivity(it);
			}
		});
        holder.classuserlist_item_idfans1.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				MainService.guiji.deleteReply(SystemConstant.baseURL+mData.get(currentPosition).get("idfans1link"));
				((ClassUserListActivity) context).createTask();
			}
		});
        holder.classuserlist_item_idfans2.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				MainService.guiji.deleteReply(SystemConstant.baseURL+mData.get(currentPosition).get("idfans2link"));
				((ClassUserListActivity) context).createTask();
			}
		});
		
        holder.classuserlist_item_classbutton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				String temp=SystemConstant.baseURL+mData.get(currentPosition).get("idcommentlink");
//				MainService.guiji.setCurrentURL(temp);
				MainService.guiji.setPageType(4);
				MainService.guiji.setBackURL(temp);
				Intent it=new Intent(context,CommentMoodActivity.class);
				context.startActivity(it);
			}
		});
		
		return convertView;
	}
	public class ClassUserListViewHolder{
		public ImageView classuserlist_item_userlogo;
		public TextView classuserlist_item_username;
		public TextView classuserlist_item_statuscontent;
		public TextView classuserlist_item_idfans1;
		public TextView classuserlist_item_idfans2;
		public TextView classuserlist_item_idmood;
		public TextView classuserlist_item_idhuoyuevalue;
		public ImageView classuserlist_item_msgpic;
		public TextView classuserlist_item_msgcontent;
		public TextView classuserlist_item_idtimeplace;
		public ImageView classuserlist_item_classbutton;
	}

}