RecyclerView形象不断刷新，当上下滚动，我们

  • Z时代
  • 2024-01-10
  • 分类：问答

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; 
    } 
}

}RecyclerView形象不断刷新，当上下滚动，我们

我知道这个问题已经被问过。但我无法解决我的问题。我以json的形式获取数据。图像通过异步任务加载。但是当我向上滚动或向下滚动时，互相替换，然后几秒钟后，图像显示在原始位置。我认为问题出在OnBind方法中。

回答：

不要让API调用onBind
在活动
2. onPostExecute {}设置适配器& 1.进行API调用

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

如果你想上的滚动API调用列表中，在onScroll方法中编写逻辑

recyclerView.addOnScrollListener

如果要更改图像wrt position of recyclerview使用Y图像加载库：例如：方
http://square.github.io/picasso/

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

以上是 RecyclerView形象不断刷新，当上下滚动，我们 的全部内容， 来源链接： utcz.com/qa/265082.html

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