毕加索在 ListFragment 中有很多大位图

Posted 2023-05-07

【中文标题】毕加索在 ListFragment 中有很多大位图

【英文标题】：Picasso with a lot of big bitmaps in ListFragment

【发布时间】：2015-10-04 13:44:11

【问题描述】：

我有一个关于毕加索图书馆的问题。我在 ListFragment 中有 ListView 从服务器下载图像。我正在使用 BaseAdapter 填充该 ListView。问题是当我遇到大量图像（10+）时，当毕加索尝试加载它们时，我遇到了加载问题。基本上我必须在它们加载之前稍等片刻，突然它们都同时加载了。仅当我使用此片段转到另一个活动并返回 MainActivity 时才会发生这种情况这是我的 baseAdapter 源代码：

public class MySimpleArrayAdapter extends BaseAdapter 
private final Context context;
private final ArrayList<String> values;
private final double[] lat2;
private final double[] lon2;
private final double lat;
private final double lon;
private final int[] id;
private final int[] timestamp;
private final int[] likes;
private final String[] tags;
private final String[] statusText;
private final String[] imgLink;
private final String[] author;


public MySimpleArrayAdapter(Context context, ArrayList<String> values, double[] lat2,double[] lon2,double lat, double lon, int[] id,int[] timestamp,int[] likes, String[] tags,String[] statusText,String[] imgLink, String[] author) 
    this.context = context;
    this.values = values;
    this.lat2 = lat2;
    this.lon2 = lon2;
    this.lat = lat;
    this.lon = lon;
    this.id = id;
    this.timestamp = timestamp;
    this.likes = likes;
    this.tags = tags;
    this.statusText = statusText;
    this.imgLink = imgLink;
    this.author = author;


@Override
public int getCount() 
    if(lat2!=null)
    return lat2.length;
    else
        return 0;
    


@Override
public Object getItem(int position) 
    return null;


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


@Override
public View getView(final int position, View convertView, ViewGroup parent) 
    View v = convertView;
    if (convertView == null) 
        LayoutInflater li = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = li.inflate(R.layout.simple_list_item, parent, false);
    
    try 

    int distance = 0;
    if (lat2 != null && lon2 != null) 
        distance = (int) computeDistanceBetween(new LatLng(lat, lon), new LatLng(lat2[getCount()-position-1], lon2[getCount()-position-1]));
    
    ImageButton like = (ImageButton)v.findViewById(R.id.likeButton);
    like.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 
            likeStatus(id[getCount()-position-1],author[getCount()-position-1]);
        
    );
    TextView firsteLine = (TextView) v.findViewById(R.id.StatusText);
    ImageView imageView = (ImageView) v.findViewById(R.id.StatusImage);
    imageView.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View v) 
            String author1 = null;
            String link = null;
            String text3 = null;
            String tags1 = null;
            int distance = 0;
            int ts = 0;
            int id1 = 0;
            int likes1 = 0;
            LatLng ll = new LatLng(lat, lon);
            id1 = id[getCount()-position-1];
            likes1 = likes[getCount()-position-1];
            author1 = author[getCount()-position-1];
            link = imgLink[getCount()-position-1];
            text3 = statusText[getCount()-position-1];
            if (lat2 != null&&lon2 != null) 
                distance = (int) computeDistanceBetween(ll, new LatLng(lat2[getCount()-position-1], lon2[getCount()-position-1]));
            
            else 
                distance=0;
            
            ts = timestamp[getCount()-position-1];
            tags1 = tags[getCount()-position-1];
            Intent intent = new Intent(context, ShowMarkerContent.class);
            intent.putExtra("id", id1);
            intent.putExtra("likes", likes1);
            intent.putExtra("tags", tags1);
            intent.putExtra("link", link);
            intent.putExtra("author", author1);
            intent.putExtra("text", text3);
            intent.putExtra("distance", distance);
            intent.putExtra("time", ts);
            intent.putExtra("number", getCount()-position-1);
            context.startActivity(intent);
        
    );
        Picasso.with(context).cancelRequest(imageView);
    Picasso.with(context).load("http://files.guri.sk/" + imgLink[getCount()-position-1]).fit().centerCrop().error(R.mipmap.ic_launcher).placeholder(R.drawable.progress_animation).into(imageView);

        Log.d("Tag","http://files.guri.sk/"+imgLink[getCount()-position-1]);
    if (distance > 1000) 
        distance = distance / 1000;
        firsteLine.setText(values.get(getCount()-position-1) + " (" + MySearchAdapter.caluculateTimeAgo(timestamp[getCount()-position-1]) + ", " + String.valueOf(distance) + "km) ");
     else 
        firsteLine.setText(values.get(getCount()-position-1) + " (" + MySearchAdapter.caluculateTimeAgo(timestamp[getCount()-position-1]) + ", " + String.valueOf(distance) + "m) ");
    
    
    catch (IndexOutOfBoundsException e)

    

    return v;


public void likeStatus(int id, String user)
    try 
        JSONObject toSend = new JSONObject();
        toSend.put("user", user);
        toSend.put("id", id);
        JSONTransmitterLike transmitter = new JSONTransmitterLike();
        String resp = null;
        try 
            resp = transmitter.execute(new JSONObject[]toSend).get();
            resp = resp.replace("\n", "").replace("\r", "");
            Log.d("Tag", resp);
         catch (InterruptedException e) 
            e.printStackTrace();
         catch (ExecutionException e) 
            e.printStackTrace();
        
        JSONObject jObj = new JSONObject(resp);
        int numberOfLikes = jObj.getInt("like_total");
        int result = jObj.getInt("result");
        int liked = jObj.getInt("liked");
        if (result == 2) 
            unLike(id, user);
         else 
            Toast.makeText(context,"You like this",Toast.LENGTH_SHORT).show();
        
     catch (JSONException e) 
        e.printStackTrace();
    


public void unLike(int id, String user) 
    try 
        JSONObject toSend = new JSONObject();
        toSend.put("user", user);
        toSend.put("id", id);
        JSONTransmitterUnlike transmitter = new JSONTransmitterUnlike();
        String resp = null;
        try 
            resp = transmitter.execute(new JSONObject[]toSend).get();
            resp = resp.replace("\n", "").replace("\r", "");
            Log.d("Tag", resp);
         catch (InterruptedException e) 
            e.printStackTrace();
         catch (ExecutionException e) 
            e.printStackTrace();
        
        JSONObject jObj = new JSONObject(resp);
        int numberOfLikes = jObj.getInt("like_total");
        int result = jObj.getInt("result");
        int liked = jObj.getInt("liked");
        Toast.makeText(context,"You don't like this",Toast.LENGTH_SHORT).show();
     catch (JSONException e) 
        e.printStackTrace();
    

【参考方案1】：

只有当这是一个回收视图时，您才应该取消请求，而不是针对每个视图。

干杯！

【讨论】：

您好，谢谢您的回复。嗯，我用这条线的时候和不用的时候效果是一样的

你把“Picasso.with(context).cancelRequest(imageView);”放了吗进入其他？ （当 convertView 不为空时）？

我的意思是不管我用不用这条线，结果都是一样的。