调色板 API 不工作（仅在调试时工作）

Question

我在其中创建了一个简单的 RecyclerView 和一个 CardView。在CardView中有ImageView和TextView。所以我得到图像的 url 并使用 Picasso 加载它。使用 Palette API 之前一切正常。所以我想从图像中获取颜色并将其设置为 CardView 和 TextView.

这是我的 RecyclerView.Adapter

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder> {

    private List<String> imagesUrl;
    private List<String> imageDescription;

    RecyclerAdapter(List<String> imagesUrl, List<String> imageDescription) {
        this.imagesUrl = imagesUrl;
        this.imageDescription = imageDescription;
    }

    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int position) {
        View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false);
        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, int position) {
        myViewHolder.textView.setText(imageDescription.get(position));
        Picasso.get()
                .load(imagesUrl.get(position))
                .into(new Target() {
                    @Override
                    public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
                        myViewHolder.imageView.setImageBitmap(bitmap);
                        myViewHolder.getPalette();
                    }

                    @Override
                    public void onBitmapFailed(Exception e, Drawable errorDrawable) {
                        myViewHolder.imageView.setImageResource(R.drawable.error);
                    }

                    @Override
                    public void onPrepareLoad(Drawable placeHolderDrawable) {
                        myViewHolder.imageView.setImageResource(R.drawable.placeholder);
                    }
                });
    }

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

    class MyViewHolder extends RecyclerView.ViewHolder {

        private ImageView imageView;
        private TextView textView;
        private CardView cardView;

        MyViewHolder(@NonNull View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.imageView);
            textView = itemView.findViewById(R.id.textView);
            cardView = itemView.findViewById(R.id.cardView);
        }

        private void getPalette() {
            Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
            Palette.from(bitmap).generate(new Palette.PaletteAsyncListener() {
                @Override
                public void onGenerated(@Nullable Palette palette) {
                    //assert palette != null;
                    Palette.Swatch swatch = palette.getVibrantSwatch();
                    //assert swatch != null;
                    textView.setTextColor(swatch.getBodyTextColor());
                    cardView.setCardBackgroundColor(swatch.getRgb());
                }
            });
        }
    }
}

每次显示占位符图像。当我进行调试时，它可以工作。所以有什么问题？

Answer 1

所以问题不在 Palette API。问题是目标是垃圾 collected.So 解决方案是在对象上实现它或将其存储在字段中并将其设置为我们 ImageView.

的标签

这里。现在可以使用了。

@Override
public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, int position) {
    myViewHolder.textView.setText(imageDescription.get(position));
    Target target = new Target() {
        @Override
        public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
            myViewHolder.imageView.setImageBitmap(bitmap);
            myViewHolder.getPalette();
        }

        @Override
        public void onBitmapFailed(Drawable errorDrawable) {
            myViewHolder.imageView.setImageResource(R.drawable.error);
        }

        @Override
        public void onPrepareLoad(Drawable placeHolderDrawable) {
            myViewHolder.imageView.setImageResource(R.drawable.placeholder);
        }
    };

    Picasso.with(context)
            .load(imagesUrl.get(position))
            .into(target);

    myViewHolder.imageView.setTag(target);
}

我想有一天这会对任何人有所帮助）））谢谢

调色板 API 不工作（仅在调试时工作）

Palette API not working (Works only when I'm debugging)

android

android-recyclerview

android-palette