Firebase图像存储-从Firebase实时数据库+存储中加载原始图像之前的缩略图

Question

我的Android应用程序中有毕加索，因此我可以从Firebase数据库+存储中检索图像URL到我的recyclerview并显示它。现在，我已将所有Firebase存储映像制作为缩略图。所以我想在原始图像之前加载缩略图。图像名称以-502.jpg开头，缩略图以thumb_502.jpg开头。

ImageAdapter类

 public class ImageAdapter extends 
    RecyclerView.Adapter<ImageAdapter.ImageViewHolder> {
    private Context mContext;
    private List<Upload> mUploads;

    private OnItemClickListener mListener;

    public ImageAdapter(Context context, List<Upload> uploads) {
        mContext = context;
        mUploads = uploads;
    }

    @Override
    public ImageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(mContext).inflate(R.layout.image_item, parent, false);
        return new ImageViewHolder(v);
    }    
    @Override
    public void onBindViewHolder(final ImageViewHolder holder, int position) {
        final Upload uploadCurrent = mUploads.get(position);

        String imgUrl = uploadCurrent.getImageUrl();
        holder.imageView.setVisibility(View.VISIBLE);
        if( imgUrl != null && !"".equals(imgUrl) ){

        Picasso.with(mContext)
                .load(uploadCurrent.getImageUrl())
                .into(holder.imageView);}
                else{
            Picasso.with(mContext).cancelRequest(holder.imageView);
        }

    }

上传课程

public class Upload {
    private String mName;
    private String mImageUrl;
    private String mKey;

    public Upload() {
        //empty constructor needed
    }

    public Upload(String name, String imageUrl) {
        /*if (name.trim().equals("")) {
            name = "No Name";
        }*/

        mName = name;
        mImageUrl = imageUrl;
    }

    public String getName() {
        return mName;
    }

    public void setName(String name) {
        mName = name;
    }

    public String getImageUrl() {
        return mImageUrl;
    }

    public void setImageUrl(String imageUrl) {
        mImageUrl = imageUrl;
    }

    @Exclude
    public String getKey(){
        return mKey;
    }
    @Exclude
    public void setKey(String key){
        mKey = key;
    }
}

食品课

@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) {
    final View view = inflater.inflate(R.layout.activity_image1, container, false);

    mRecyclerView = view.findViewById(R.id.recycler_view);
    //mRecyclerView.setHasFixedSize(true);
    //mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
    GridLayoutManager gridLayoutManager = new GridLayoutManager(getContext(),3);
    mRecyclerView.setLayoutManager(gridLayoutManager);

    mProgressCircle = view.findViewById(R.id.progress_circle);

    mUploads = new ArrayList<>();
    //FirebaseDatabase.getInstance().setPersistenceEnabled(true);
    mDatabaseRef = FirebaseDatabase.getInstance().getReference("uploads");

    mDatabaseRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                Upload upload = postSnapshot.getValue(Upload.class);
                mUploads.add(upload);
                Collections.reverse(mUploads);

            }

            mAdapter = new ImageAdapter(getContext(), mUploads);

            mRecyclerView.setAdapter(mAdapter);