Question

  public class Adapter1 extends RecyclerView.Adapter<Adapter1.ViewHolder>  {
ArrayList<CategoryModels> categoryList;
Context context;

public Adapter1(ArrayList<CategoryModels> categoryList, Context context){
    this.categoryList =categoryList;
    this.context = context;

}


@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
     View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_scategory_single_layout,null);
    final ViewHolder viewHolder=new ViewHolder(view);

    return viewHolder;
}



@Override
public void onBindViewHolder(ViewHolder holder, int position) {

        CategoryModels categoryModels = categoryList.get(position);

    holder.name.setText(categoryModels.getName());

    int pos = getItemViewType(position);
    if(categoryList.get(pos).getImage() == null) {

        holder.image.setVisibility(View.GONE);
    } else
        new DownloadImageTask(holder.image).execute(baseurl+categoryModels.getImage());
        //Picasso.with(categoryList.ge).load("http://www.zawallpaper.com/includes/images/"+categoryModels.getImage()).resize(120, 60).into(holder.image);
}

@Override
public int getItemViewType(int position) {
    return super.getItemViewType(position);
}

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

public class ViewHolder extends RecyclerView.ViewHolder{
    TextView name;
    ImageView image;
    public ViewHolder(View itemView) {
        super(itemView);
        name = (TextView) itemView.findViewById(R.id.name);
        image = (ImageView) itemView.findViewById(R.id.imgcategory);
    }
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
    ImageView bmImage;

    public DownloadImageTask(ImageView bmImage) {
        this.bmImage = bmImage;
    }


    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap mIcon = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            mIcon = BitmapFactory.decodeStream(in);
        } catch (Exception e) {
            Log.e("Error", e.getMessage());
            e.printStackTrace();
        }
        return mIcon;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
        //ProgressDialogue.hideProgressDialogue();
    }


}
public Bitmap StringToBitMap(String encodedString) {
    try {
        byte[] encodeByte = Base64.decode(encodedString, Base64.DEFAULT);
        Bitmap bitmap = BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length);
        return bitmap;
    } catch (Exception e) {
        e.getMessage();
        return null;
    }
}

}

我知道之前已经问过这个问题。但我无法解决我的问题。我正在以json的形式获取数据。图像通过异步任务加载。但是，当我向上或向下滚动时，互相替换，然后在几秒钟后，图像以原始位置显示。我认为问题出在OnBind Method上。

Answer 1

不要在onBind上打电话给api 1.在活动中打电话api 2.＆amp;在onPostExecute {}设置适配器

recyclerview.setAdapter(new YourAdapter(dataList))<br>

如果要在滚动列表时进行Api调用，请在onScroll方法中编写逻辑

recyclerView.addOnScrollListener

如果要更改图像，请使用recyclelerview的位置使用任何图像加载库：例如：方形
http://square.github.io/picasso/

Picasso.with(context).load(url).into(view);

当我们向上和向下滚动时，RecyclerView图像会保持清爽

1 个答案: