滚动列表视图时，列表项中的更新视图不​​会保持更新[IMG + SOURCE]

Question

我的问题的简短版本：如果我有一个列表视图，其中每个项目都有一个按钮，并且该按钮导致该列表项目上的文本视图被更新，我该如何对其进行更改从getView permanent中的onClickListener列出行？

问题的详细说明：我有一个listview，listview有一个“bump”按钮（相当于Facebook上的“喜欢”按钮），当用户按下这个按钮时，就会发生3件事：

1. 向我的api发出异步请求，通过向我的某个db表添加记录来记录“bump”。如果请求成功，api会发出一个包含2个字段的响应（is_bumped（boolean）＆amp; bump_count（int））
2. 如果api请求成功，那么我们从响应中获取bumpCount并使用它来更新bumpTv以反映列表项被“碰撞”的新总次数....示例：“3 Bumps”< / LI>
3. 如果API请求成功并且isBumped = true，那么我们将图像资源更新为看起来已选中/按下的我的凹凸图标版本。

乍一看这一切都很好，但是如果你“碰撞”一个列表项然后一直滚动到列表的底部然后再回到顶部，你刚刚碰到的列表项将不再除非您刷新整个活动，否则看起来会被碰撞。我知道这必须与我绑定到未更新的适配器的数据有关，但如何在不刷新整个更新的情况下进行更新？



package com.quothor.helpers;

import java.util.ArrayList; 
import java.util.HashMap;

import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.FragmentManager;
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.ImageButton;
import android.widget.TextView;
import android.widget.Toast;





public class NewLazyAdapter extends BaseAdapter {

 private Activity activity;
 private ArrayList<HashMap<String, String>> data;
 private static LayoutInflater inflater=null;
 public ImageLoader imageLoader; 
 public FragmentManager frag_manager;



 static class ViewHolder {
  TextView name;
  TextView div3;
  TextView div2;
  TextView bumpTv;
  TextView message;
  TextView commentsTv;
  SmartImageView thumb_image;
  ImageButton bumpBtn;
  ImageButton requestBtn;
  ImageButton settingsBtn;
  TextView created ;

    int position;
  }

 public NewLazyAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
  activity = a;
  data=d;
  inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  imageLoader=new ImageLoader(activity.getApplicationContext());
 }

 public NewLazyAdapter(Activity a, ArrayList<HashMap<String, String>> d, FragmentManager manager) {
  activity = a;
  frag_manager=manager;
  data=d;
  inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  imageLoader=new ImageLoader(activity.getApplicationContext());
 }

 public int getCount() {
  return data.size();
 }

 public Object getItem(int position) {
  return position;
 }

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

 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder holder;
  HashMap<String, String> update = new HashMap<String, String>();
  update = data.get(position); 

  if(convertView==null){
   convertView = inflater.inflate(R.layout.list_row, null);
   holder = new ViewHolder();

  holder.name = (TextView)convertView.findViewById(R.id.name); // title
  holder.div3 = (TextView)convertView.findViewById(R.id.divider3); // title
  holder.div2 = (TextView)convertView.findViewById(R.id.divider2); // title

  holder.bumpTv = (TextView)convertView.findViewById(R.id.bump); // title
  holder.message = (TextView)convertView.findViewById(R.id.message); // artist name
  holder.commentsTv = (TextView)convertView.findViewById(R.id.comments); // artist name

  holder.thumb_image = (SmartImageView) convertView.findViewById(R.id.list_image);
  holder.bumpBtn= (ImageButton)convertView.findViewById(R.id.bump_btn);
  holder.requestBtn = (ImageButton)convertView.findViewById(R.id.hidden_btn);

  holder.settingsBtn = (ImageButton)convertView.findViewById(R.id.settings_btn);
  holder.created = (TextView)convertView.findViewById(R.id.created); // duration
  holder.bumpBtn.setTag(holder);
  holder.bumpBtn.setOnClickListener(new Bump(position, update));
  convertView.setTag(holder);

  } else {
         holder = (ViewHolder) convertView.getTag();
     }



  Log.i("LazyAdapter data", String.valueOf(position)+" "+update.toString());

  if(update.get("bump_count") != null){
   holder.bumpBtn.setVisibility(holder.bumpBtn.VISIBLE);
   //holder.bumpBtn.setOnClickListener(new Bump(position, update));
   String bump_count=update.get("bump_count");
   String is_bumped=update.get("is_bumped");


   //sets bump textview
   if(bump_count.equals("0")){ 

   }else if(bump_count.equals("1")){
    holder.div3.setVisibility(holder.div3.VISIBLE);
    holder.bumpTv.setVisibility(holder.bumpTv.VISIBLE);
    holder.bumpBtn.setVisibility(holder.bumpBtn.VISIBLE);
    holder.bumpTv.setText(bump_count+" bump"); 
   }else{
    holder.div3.setVisibility(holder.div3.VISIBLE);
    holder.bumpTv.setVisibility(holder.bumpTv.VISIBLE);
    holder.bumpBtn.setVisibility(holder.bumpBtn.VISIBLE);
    holder.bumpTv.setText(bump_count+" bumps"); 

   }
   if(is_bumped.equals("true")){
    holder.bumpBtn.setImageResource(R.drawable.quothor_thumb_blue);
    //bumpBtn.setBackgroundResource(R.drawable.quothor_bump_btn_bg_black);
   }else{
    holder.bumpBtn.setImageResource(R.drawable.quothor_bump_icon_black);
    //bumpBtn.setBackgroundResource(android.R.drawable.btn_default); 
   }

  }

  if(update.get("relationship_view")!=null){
   if(update.get("uid")!=TabHostFragmentActivity.loggedin_uid){
    if(update.get("relation_to_user")!=null){


     holder.requestBtn.setVisibility(holder.requestBtn.VISIBLE);

     String relation= update.get("relation_to_user");

     if(relation.equals("Friend")){
      holder.settingsBtn.setVisibility(holder.settingsBtn.VISIBLE); 
      holder.requestBtn.setImageResource(R.drawable.friend_btn);

     }else if(relation.equals("Familiar")){
      holder.settingsBtn.setVisibility(holder.settingsBtn.VISIBLE); 
      holder.requestBtn.setImageResource(R.drawable.familiar_btn);
     }


     holder.requestBtn.setOnClickListener(new myOnClickListener(position));
     holder.settingsBtn.setOnClickListener(new myOnClickListener(position));


    }

   }

  }



  if(update.get("created") != null){
   TextView created = (TextView)convertView.findViewById(R.id.created); // duration
   String str_created=update.get("created");
   long created_l = Long.parseLong(str_created);
   String time_ago=TimeAgo.fromPhpTime(created_l);
   created.setVisibility(convertView.VISIBLE);
   created.setText(time_ago);

  }
  if(update.get("comment_count")!=null){
   holder.div2.setVisibility(holder.div2.VISIBLE);
   holder.commentsTv.setVisibility(holder.commentsTv.VISIBLE);

   String comments = update.get("comment_count");
   if(comments.equals("0")){
    holder.commentsTv.setText("no comments");
   }else if(comments.equals("1")){
    holder.commentsTv.setText("1 comment");
   }else{
    holder.commentsTv.setText(comments+ " comments");
   }


  }else{
   holder.commentsTv.setVisibility(holder.commentsTv.INVISIBLE);

  }
  // Setting all values in listview
  holder.name.setText(update.get("name"));
  if(update.get("message") != null){
   holder.message.setText(update.get("message"));
  }else{

   holder.message.setVisibility(holder.message.INVISIBLE);
  }
  holder.thumb_image.setImageUrl(update.get("thumb_img"));
  /*
        name.setOnClickListener(new myOnClickListener(position));
        thumb_image.setOnClickListener(new myOnClickListener(position));
   */
  return convertView;
 }

 public class myOnClickListener implements OnClickListener{
  private int position;
  private String clicked_uid;
  public myOnClickListener(int position){
   this.position=position;
  }
  @Override
  public void onClick(View v) {

   HashMap<String, String> update = new HashMap<String, String>();
   update = data.get(position); 
   Log.i("Update Position:", update.toString());
   clicked_uid=update.get("uid");
   Log.d("Clicked UID:", clicked_uid+"");
   String relation= update.get("relation_to_user");
   String uid = update.get("uid");
   String name = update.get("name");
   String thumb_img = update.get("thumb_img");


   FragmentManager fm = frag_manager;
   EditRelationshipDialog editRelationshipDialog = new EditRelationshipDialog().newInstance(uid,relation,name,thumb_img);
   editRelationshipDialog.show(fm, "relationshipsdialog");



  }

 }


    public class Bump implements OnClickListener{
     private int position;
  private String clicked_uid;
  public Bump(int position,  HashMap<String, String> update){
      this.position=position;

     }
  @Override
  public void onClick(View v) {
   HashMap<String, String> update = new HashMap<String, String>();
   update = data.get(position); 
   final View theview=v;
   Log.i("Update Position:", update.toString());
   String msg_id=update.get("msg_id");
   //ViewHolder mH = (ViewHolder) theview.getTag();

        // mH.message.setText("clicked");

   RequestParams params = new RequestParams();
   params.put("msg_id", msg_id);
   params.put("loggedin_uid", TabHostFragmentActivity.loggedin_uid);




   RestClient.post(TabHostFragmentActivity.token,"http://api/bump", params, new JsonHttpResponseHandler() {
    @Override
    public void onFailure(Throwable arg0, JSONObject arg1) {
     // TODO Auto-generated method stub
     super.onFailure(arg0, arg1);

     Log.i("bump request failed in lazy adapter", arg1.toString());
     Toast.makeText(activity.getApplicationContext(), arg1.toString() , Toast.LENGTH_LONG).show();
    }

    @Override
    public void onSuccess(JSONObject json) {
     ViewHolder mH = (ViewHolder) theview.getTag();

     try {

      String is_bumped=json.getString("is_bumped");
      String bump_count=json.getString("bump_count");
      if(bump_count != null){ 
       if(bump_count.equals("0")){ 

       }else if(bump_count.equals("1")){
        mH.div3.setVisibility(mH.div3.VISIBLE);
        mH.bumpTv.setVisibility(mH.bumpTv.VISIBLE);
        mH.bumpBtn.setVisibility(mH.bumpBtn.VISIBLE);
        mH.bumpTv.setText(bump_count+" bump"); 
       }else{
        mH.div3.setVisibility(mH.div3.VISIBLE);
        mH.bumpTv.setVisibility(mH.bumpTv.VISIBLE);
        mH.bumpBtn.setVisibility(mH.bumpBtn.VISIBLE);
        mH.bumpTv.setText(bump_count+" bumps"); 

       }


      } 
     } catch (JSONException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
     try {
      String is_bumped=json.getString("is_bumped");

      if(is_bumped.equals("true")){
       mH.bumpBtn.setImageResource(R.drawable.quothor_thumb_blue);
       //bumpBtn.setBackgroundResource(R.drawable.quothor_bump_btn_bg_black);
      }else{
       mH.bumpBtn.setImageResource(R.drawable.quothor_bump_icon_black);
       //bumpBtn.setBackgroundResource(android.R.drawable.btn_default); 
      }
     } catch (JSONException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }


    }
   });


  }

    }
}

编辑：在评论中听取了建议后，我确​​信我的列表会按照我的预期方式开始运作，但它只会打开一个全新的地狱......现在由于某种原因，如果用户点击前6个项目中任何位置的“碰撞”按钮，它就可以正常工作，但除此之外，还会发生一些奇怪的事情。当用户点击前6个项目下面的一个列表项目上的按钮按钮时，它会发送错误的位置，并且它的位置介于0到6之间？！？！？

package com.quothor.helpers;

import java.util.ArrayList; 
import java.util.HashMap;

import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.FragmentManager;
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.ImageButton;
import android.widget.TextView;
import android.widget.Toast;




public class NewLazyAdapter extends BaseAdapter {

 private Activity activity;
 private ArrayList<HashMap<String, String>> data;
 private static LayoutInflater inflater=null;
 public ImageLoader imageLoader; 
 public FragmentManager frag_manager;



 static class ViewHolder {
  TextView name;
  TextView div3;
  TextView div2;
  TextView bumpTv;
  TextView message;
  TextView commentsTv;
  SmartImageView thumb_image;
  ImageButton bumpBtn;
  ImageButton requestBtn;
  ImageButton settingsBtn;
  TextView created ;

    int position;
  }

 public NewLazyAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
  activity = a;
  data=d;
  inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  imageLoader=new ImageLoader(activity.getApplicationContext());
 }

 public NewLazyAdapter(Activity a, ArrayList<HashMap<String, String>> d, FragmentManager manager) {
  activity = a;
  frag_manager=manager;
  data=d;
  inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  imageLoader=new ImageLoader(activity.getApplicationContext());
 }

 public int getCount() {
  return data.size();
 }

 public Object getItem(int position) {
  return position;
 }

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

 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder holder;
  HashMap<String, String> update = new HashMap<String, String>();
  update = data.get(position); 
  Log.i("position being scrolled over", String.valueOf(position));

  if(convertView==null){
   convertView = inflater.inflate(R.layout.list_row, null);
   holder = new ViewHolder();

  holder.name = (TextView)convertView.findViewById(R.id.name); // title
  holder.div3 = (TextView)convertView.findViewById(R.id.divider3); // title
  holder.div2 = (TextView)convertView.findViewById(R.id.divider2); // title

  holder.bumpTv = (TextView)convertView.findViewById(R.id.bump); // title
  holder.message = (TextView)convertView.findViewById(R.id.message); // artist name
  holder.commentsTv = (TextView)convertView.findViewById(R.id.comments); // artist name

  holder.thumb_image = (SmartImageView) convertView.findViewById(R.id.list_image);
  holder.bumpBtn= (ImageButton)convertView.findViewById(R.id.bump_btn);
  holder.requestBtn = (ImageButton)convertView.findViewById(R.id.hidden_btn);

  holder.settingsBtn = (ImageButton)convertView.findViewById(R.id.settings_btn);
  holder.created = (TextView)convertView.findViewById(R.id.created); // duration
  holder.bumpBtn.setTag(holder);
  holder.bumpBtn.setOnClickListener(new Bump(position, update));
  convertView.setTag(holder);

  } else {
         holder = (ViewHolder) convertView.getTag();
     }



  Log.i("LazyAdapter data", String.valueOf(position)+" "+update.toString());

  if(update.get("bump_count") != null){
   holder.bumpBtn.setVisibility(holder.bumpBtn.VISIBLE);
   //holder.bumpBtn.setOnClickListener(new Bump(position, update));
   String bump_count=update.get("bump_count");
   String is_bumped=update.get("is_bumped");


   //sets bump textview
   if(bump_count.equals("0")){ 

   }else if(bump_count.equals("1")){
    holder.div3.setVisibility(holder.div3.VISIBLE);
    holder.bumpTv.setVisibility(holder.bumpTv.VISIBLE);
    holder.bumpBtn.setVisibility(holder.bumpBtn.VISIBLE);
    holder.bumpTv.setText(bump_count+" bump"); 
   }else{
    holder.div3.setVisibility(holder.div3.VISIBLE);
    holder.bumpTv.setVisibility(holder.bumpTv.VISIBLE);
    holder.bumpBtn.setVisibility(holder.bumpBtn.VISIBLE);
    holder.bumpTv.setText(bump_count+" bumps"); 

   }
   if(is_bumped.equals("true")){
    holder.bumpBtn.setImageResource(R.drawable.quothor_thumb_blue);
    //bumpBtn.setBackgroundResource(R.drawable.quothor_bump_btn_bg_black);
   }else{
    holder.bumpBtn.setImageResource(R.drawable.quothor_bump_icon_black);
    //bumpBtn.setBackgroundResource(android.R.drawable.btn_default); 
   }

  }

  if(update.get("relationship_view")!=null){
   if(update.get("uid")!=TabHostFragmentActivity.loggedin_uid){
    if(update.get("relation_to_user")!=null){


     holder.requestBtn.setVisibility(holder.requestBtn.VISIBLE);

     String relation= update.get("relation_to_user");

     if(relation.equals("Friend")){
      holder.settingsBtn.setVisibility(holder.settingsBtn.VISIBLE); 
      holder.requestBtn.setImageResource(R.drawable.friend_btn);

     }else if(relation.equals("Familiar")){
      holder.settingsBtn.setVisibility(holder.settingsBtn.VISIBLE); 
      holder.requestBtn.setImageResource(R.drawable.familiar_btn);
     }


     holder.requestBtn.setOnClickListener(new myOnClickListener(position));
     holder.settingsBtn.setOnClickListener(new myOnClickListener(position));


    }

   }

  }



  if(update.get("created") != null){
   TextView created = (TextView)convertView.findViewById(R.id.created); // duration
   String str_created=update.get("created");
   long created_l = Long.parseLong(str_created);
   String time_ago=TimeAgo.fromPhpTime(created_l);
   created.setVisibility(convertView.VISIBLE);
   created.setText(time_ago);

  }
  if(update.get("comment_count")!=null){
   holder.div2.setVisibility(holder.div2.VISIBLE);
   holder.commentsTv.setVisibility(holder.commentsTv.VISIBLE);

   String comments = update.get("comment_count");
   if(comments.equals("0")){
    holder.commentsTv.setText("no comments");
   }else if(comments.equals("1")){
    holder.commentsTv.setText("1 comment");
   }else{
    holder.commentsTv.setText(comments+ " comments");
   }


  }else{
   holder.commentsTv.setVisibility(holder.commentsTv.INVISIBLE);

  }
  // Setting all values in listview
  holder.name.setText(update.get("msg_id"));
  if(update.get("message") != null){
   holder.message.setText(update.get("message"));
  }else{

   holder.message.setVisibility(holder.message.INVISIBLE);
  }
  holder.thumb_image.setImageUrl(update.get("thumb_img"));
  /*
        name.setOnClickListener(new myOnClickListener(position));
        thumb_image.setOnClickListener(new myOnClickListener(position));
   */

  return convertView;
 }

 public class myOnClickListener implements OnClickListener{
  private int position;
  private String clicked_uid;
  public myOnClickListener(int position){
   this.position=position;
  }
  @Override
  public void onClick(View v) {

   HashMap<String, String> update = new HashMap<String, String>();
   update = data.get(position); 
   Log.i("Update Position:", update.toString());
   clicked_uid=update.get("uid");
   Log.d("Clicked UID:", clicked_uid+"");
   String relation= update.get("relation_to_user");
   String uid = update.get("uid");
   String name = update.get("name");
   String thumb_img = update.get("thumb_img");


   FragmentManager fm = frag_manager;
   EditRelationshipDialog editRelationshipDialog = new EditRelationshipDialog().newInstance(uid,relation,name,thumb_img);
   editRelationshipDialog.show(fm, "relationshipsdialog");



  }

 }


    public class Bump implements OnClickListener{
     private int position;
  private String clicked_uid;
  public Bump(int position,  HashMap<String, String> update){
      this.position=position;


     }
  @Override
  public void onClick(View v) {
   HashMap<String, String> update = new HashMap<String, String>();
   update = data.get(position); 
   final View theview=v;
      Log.i("POSITION BEING CLICKED",String.valueOf(position));
   Log.i("Update Position:", update.toString());

   String msg_id=update.get("msg_id");
   Log.i("msg_id",msg_id);
   //ViewHolder mH = (ViewHolder) theview.getTag();

        // mH.message.setText("clicked");

   RequestParams params = new RequestParams();
   params.put("msg_id", msg_id);
   params.put("loggedin_uid", TabHostFragmentActivity.loggedin_uid);




   RestClient.post(TabHostFragmentActivity.token,"http://api/content/bump", params, new JsonHttpResponseHandler() {
    @Override
    public void onFailure(Throwable arg0, JSONObject arg1) {
     // TODO Auto-generated method stub
     super.onFailure(arg0, arg1);

     Log.i("bump request failed in lazy adapter", arg1.toString());
     Toast.makeText(activity.getApplicationContext(), arg1.toString() , Toast.LENGTH_LONG).show();
    }

    @Override
    public void onSuccess(JSONObject json) {
     ViewHolder mH = (ViewHolder) theview.getTag();

     HashMap<String, String> latestUpdate = new HashMap<String, String>();
     latestUpdate = data.get(position);
     Log.i("list item being edited", latestUpdate.toString());

     try {
      String bump_count=json.getString("bump_count");
      if(bump_count != null){
       latestUpdate.put("bump_count", bump_count);
      } 
     } catch (JSONException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }



     try {
      String is_bumped=json.getString("is_bumped");
      latestUpdate.put("is_bumped", is_bumped);
     } catch (JSONException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }

     data.remove(position);
     data.add(position, latestUpdate);
     notifyDataSetChanged();
    }
   });


  }

    }
}

Answer 1

在问题的评论中，确定即使UI正在更新（基于用户交互），适配器getView()使用的基础数据也不是。

解决方案：更新数据源并在适配器上调用notifyDataSetChanged()。让getView()处理UI更新。

阅读评论以获取更多信息。