[转]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<Integer,View> lmap = new HashMap<Integer,View>();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。

[java] view plaincopy

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<Integer,View> lmap = new HashMap<Integer,View>();

private LayoutInflater mInflater=null;

private List<Map<String, String>> mData=null;

private ClassUserListImageDownloadTask imgtask=null;

private Context context;

public List<Map<String, String>> getmData() {

return mData;

}

public void setmData(List<Map<String, String>> 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;

}

}