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

2401_85729556

于 2024-06-24 01:45:21 发布

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文章标签： android

本文链接：https://blog.youkuaiyun.com/2401_85729556/article/details/139909867

版权

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 plain copy

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(“idmo
od”));
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) {