Question

 private DisplayImageOptions options;
@Override
public TaskViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.task, parent, false);


    options = new DisplayImageOptions.Builder()
            .cacheInMemory(true)
            .cacheOnDisk(true)
            .considerExifParams(true)
            .postProcessor(new BitmapProcessor() {
                @Override
                public Bitmap process(Bitmap bitmap) {
                    return Bitmap.createScaledBitmap(bitmap,200,200,false);
                }
            })
            .build();

    TaskViewHolder tvh = new TaskViewHolder(v);
    return tvh;
}

@Override
public void onBindViewHolder(TaskViewHolder holder, int position) {
    holder.task_title.setText(tasks.get(position).get_title());
    holder.task_date_to_end.setText(tasks.get(position).get_description());

       try {
        /*Picasso.with(context).load(tasks.get(position).get_url_to_icon()).resize(200, 200).into(holder.task_url_to_icon);*/
      ImageLoader.getInstance().displayImage(tasks.get(position).get_url_to_icon(),holder.task_url_to_icon,options);
    } catch (Exception e) {}


    if (tasks.get(position).isSelected()) {
        holder.task_layout.setBackgroundColor(Color.parseColor("#d5d5d5"));
    } else {
        holder.task_layout.setBackgroundColor(Color.TRANSPARENT);
    }
}

我使用毕加索库将网址更改为图片。当我在列表中选择smth时，其他项目上的图像会随机更改（始终使用其他项目中的现有网址进行更改）

编辑：我试图使用Universal-Image-Loader，但我一无所获。它可能是实施问题。

Answer 1

试试这个：

public class TaskAdapter extends RecyclerView.Adapter<TaskViewHolder> {

List<Task> tasks;
protected Context context;
private DisplayImageOptions options;
public TaskAdapter(List<Task> tasks, Context context) {

    //-----------This lines---------------//

    DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder()
            .cacheInMemory(true).cacheOnDisk(true)
            .imageScaleType(ImageScaleType.EXACTLY)
            .displayer(new FadeInBitmapDisplayer(300)).build();

    ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
            context)
            .defaultDisplayImageOptions(defaultOptions)
            .memoryCache(new WeakMemoryCache()).diskCacheSize(100 * 1024 * 1024).build();

    ImageLoader.getInstance().init(config);

    //-----------This lines---------------//
    options = new DisplayImageOptions.Builder()
            .showImageOnLoading(R.drawable.face)
            .showImageForEmptyUri(R.drawable.face)
            .showImageOnFail(R.drawable.face).cacheInMemory(true)
            .cacheOnDisk(true).considerExifParams(true).build();
    this.tasks = tasks;
    this.context = context;
}

@Override
public TaskViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.task, parent, false);



    TaskViewHolder tvh = new TaskViewHolder(v);
    return tvh;
}

@Override
public void onBindViewHolder(TaskViewHolder holder, int position) {
    holder.task_title.setText(tasks.get(position).get_title());
    holder.task_date_to_end.setText(tasks.get(position).get_description());
    holder.task_url_to_icon.setVisibility(View.VISIBLE);
       try {
            ImageLoader.getInstance().displayImage(tasks.get(position).get_url_to_icon(),holder.task_url_to_icon,options);

    } catch (Exception e) {
           Log.d("EXP",e.getMessage());
    }

    if (tasks.get(position).isSelected()) {
        holder.task_layout.setBackgroundColor(Color.parseColor("#d5d5d5"));
    } else {
        holder.task_layout.setBackgroundColor(Color.TRANSPARENT);
    }
}
public void setSelected(int pos) {
    try {
        tasks.get(pos).setSelected(!tasks.get(pos).isSelected());
        notifyDataSetChanged();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public void add(int position, Task task) {
    tasks.add(task);
    notifyItemInserted(position);
}

public void deleteSelectedItems() {
    for(int i=0;i<getItemCount();++i){
        if(tasks.get(i).isSelected()==true)
        {   tasks.remove(i);
             notifyItemRemoved(i);i=0;
           }
    }
}

@Override
public int getItemCount() {
    return tasks.size();
}
}

应用程序启动时，需要编写一次包含//-----------This lines---------------//注释的代码。如果您有任何ApplicationLoader类，那么请将其添加到其中。每次适配器初始化时都不需要写这些行。!!

或者将它们保留原样不会有任何区别。这只是一个澄清。

图像网址在更新时会改变，同时克服了RecyclerView项目

1 个答案: