Question

我使用毕加索在recyclerview中显示图像，但在加载图像完成时它不会自动刷新项目，我必须手动滚动才能显示图像。我有什么办法来修复它，使recyclerview项目在完成加载后自动更新显示？

这是我的适配器类：

 public class LocationListRecyclerViewAdapter extends RecyclerView
         .Adapter<LocationListRecyclerViewAdapter
         .DataObjectHolder> {
     private static String LOG_TAG = "LocationListRecyclerViewAdapter";
     private ArrayList<LocationObject> mDataset;
     private static MyClickListener myClickListener;
     private Context mContext;
     static String imageUrls;
     public static String[] thumbnailUrl;
     private LayoutInflater inflater;


     public LocationListRecyclerViewAdapter(Context context, ArrayList<LocationObject> mDataset) {
         this.mContext = context;
         this.mDataset = mDataset;

     }


     public static class DataObjectHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
         TextView locName;
         TextView locAddress;
         TextView locDistance;
         RoundedImageView roundedImageView;

         public DataObjectHolder(View itemView) {
             super(itemView);
             this.locName = (TextView) itemView.findViewById(R.id.location_name);
             this.locAddress = (TextView) itemView.findViewById(R.id.location_address);
             this.locDistance = (TextView) itemView.findViewById(R.id.location_distance);
             this.roundedImageView = (RoundedImageView) itemView.findViewById(R.id.thumbnail_location);

             Log.i(LOG_TAG, "Adding Listener");
             itemView.setOnClickListener(this);
         }

         @Override
         public void onClick(View v) {
             myClickListener.onItemClick(getAdapterPosition(), v);
         }
     }

     public void setOnItemClickListener(MyClickListener myClickListener) {
         this.myClickListener = myClickListener;
     }

     public LocationListRecyclerViewAdapter(ArrayList<LocationObject> myDataset) {
         mDataset = myDataset;
     }

     @Override
     public DataObjectHolder onCreateViewHolder(ViewGroup parent,
                                                int viewType) {
         View view = LayoutInflater.from(parent.getContext())
                 .inflate(R.layout.location_listcard_item, parent, false);

         this.mContext = parent.getContext();
         thumbnailUrl = new String[10];

         TextView locName = (TextView) view.findViewById(R.id.location_name);
         TextView locAddress = (TextView) view.findViewById(R.id.location_address);
         TextView locDistance = (TextView) view.findViewById(R.id.location_distance);
         Typeface helvetica = Typeface.createFromAsset(parent.getContext().getApplicationContext().getAssets(),"fonts/Helvetica.otf");
         locName.setTypeface(helvetica);
         locAddress.setTypeface(helvetica);
         locDistance.setTypeface(helvetica);

         DataObjectHolder dataObjectHolder = new DataObjectHolder(view);
         return dataObjectHolder;
     }

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

         LocationObject item = mDataset.get(position);

         holder.locName.setText(mDataset.get(position).getLocationName());
         holder.locAddress.setText(mDataset.get(position).getLocationAddress());
         holder.locDistance.setText(String.valueOf(mDataset.get(position).getLocationDistance())+"m");

         Log.i(position+" photos"," = "+mDataset.get(position).getLocationPhoto());

         //mContext
         Picasso.with(holder.roundedImageView.getContext()).cancelRequest(holder.roundedImageView);
         Picasso.with(holder.roundedImageView.getContext())
                 .load(mDataset.get(position).getLocationPhoto())
                 .error(R.drawable.placeholder)
                 .placeholder(R.drawable.placeholder)
                 .resize(200,200)
                 .into(holder.roundedImageView);

         holder.itemView.setTag(item);

     }

     public void addItem(LocationObject dataObj, int index) {
         mDataset.add(index, dataObj);
         notifyItemInserted(index);
     }

     public void deleteItem(int index) {
         mDataset.remove(index);
         notifyItemRemoved(index);
     }


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

     public interface MyClickListener {
         public void onItemClick(int position, View v);
     }


 }

Answer 1

让Picasso完成它的工作，你不需要干涉下载过程，图书馆本身知道何时取消请求。

在使用图书馆之前一定要有所帮助，仔细探索它的所有优点。 http://square.github.io/picasso/

@Override
public void onBindViewHolder(DataObjectHolder holder, int position) {
    LocationObject item = mDataset.get(position);

    holder.locName.setText(item.getLocationName());
    holder.locAddress.setText(item.getLocationAddress());
    holder.locDistance.setText(String.valueOf(item.getLocationDistance())+" m");

    Picasso.with(mContext)
           .load(item.getLocationPhoto())
           .placeholder(R.drawable.placeholder)
           .resize(200,200)
           .centerCrop()
           .into(holder.roundedImageView);
}

在完成加载后，recyclerview中的毕加索无法自动刷新显示？

1 个答案: