如何使用 Palette API 动态生成颜色？

Question

浏览网站上的其他教程发现了一个将 Material Design 应用到 Android 应用程序的不错选择，它根据卡片中查看的图片选择 cardView 操作区域颜色。

在this toturial 中，他们将图像从 drawable 导入到 ciew 中，我通过创建图像地址的 arrayList 来从网站检索它，然后使用 picasso 将其输入到 cardView 中，几乎就像与教程类似，不同之处在于我没有使用不同的类来解包信息并将其转换为 ArrayList。

因此，当尝试应用教程中演示的相同方法为 placeNameHolder（cardView 中图片下方的操作区域）选择颜色时，我对如何以与我的资源兼容的方式这样做感到困惑？

如果有任何关于如何实现这一点和理解该方法的说明，我将不胜感激？

教程中的Activity_details

   @Override
 public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_places, parent, false);
return new ViewHolder(view);
 }

  @Override
  public void onBindViewHolder(final ViewHolder holder, final int position) {
final Place place = new PlaceData().placeList().get(position);

holder.placeName.setText(place.name);
Picasso.with(mContext).load(place.getImageResourceId(mContext)).into(holder.placeImage);

Bitmap photo = BitmapFactory.decodeResource(mContext.getResources(), place.getImageResourceId(mContext));

Palette.generateAsync(photo, new Palette.PaletteAsyncListener() {
  public void onGenerated(Palette palette) {
    int mutedLight = palette.getMutedColor(mContext.getResources().getColor(android.R.color.black));
    holder.placeNameHolder.setBackgroundColor(mutedLight);
  }
});
 }

 @Override
  public int getItemCount() {
return new PlaceData().placeList().size();
}

 public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public LinearLayout placeHolder;
public LinearLayout placeNameHolder;
public TextView placeName;
public ImageView placeImage;

public ViewHolder(View itemView) {
  super(itemView);
  placeHolder = (LinearLayout) itemView.findViewById(R.id.mainHolder);
  placeName = (TextView) itemView.findViewById(R.id.placeName);
  placeNameHolder = (LinearLayout) itemView.findViewById(R.id.placeNameHolder);
  placeImage = (ImageView) itemView.findViewById(R.id.placeImage);
  placeHolder.setOnClickListener(this);
} 

在我的应用中；

 public static class ViewHolder extends RecyclerView.ViewHolder {

    public TextView name;
    public ImageView picture;
    public LinearLayout placeNameHolder;

    public ViewHolder(LayoutInflater inflater, ViewGroup parent) {
        super(inflater.inflate(R.layout.item_card, parent, false));

        picture = (ImageView) itemView.findViewById(R.id.placeImage);
        name = (TextView) itemView.findViewById(R.id.card_title);
        placeNameHolder = (LinearLayout) itemView.findViewById(R.id.placeNameHolder);
    }
}
/**
 * Adapter to display recycler view.
 */
public static class ContentAdapter extends RecyclerView.Adapter<ViewHolder> {

    private Context mContext;

    public ContentAdapter(Context context) {

        this.mContext = context;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new ViewHolder(LayoutInflater.from(parent.getContext()), parent);
    }

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

        Picasso.with(mContext).load(mImages[position]).into(holder.picture);

        holder.name.setText(author[position]);

        Bitmap photo = BitmapFactory.decodeResource(mImages[position]);

        Palette.generateAsync(photo, new Palette.PaletteAsyncListener() {
            public void onGenerated(Palette palette) {
                int bgColor = palette.getMutedColor(mContext.getResources().getColor(android.R.color.black));
                holder.placeNameHolder.setBackgroundColor(bgColor);
            }
        });
    }

不同的是我的资源是;

          Firebase ref = new Firebase("https://wi4x4.firebaseio.com/data/images");
    ref.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot snapshot) {

            if(snapshot !=null) {
                for (DataSnapshot child : snapshot.getChildren()) {
                    Log.i("MyTag", child.getValue().toString());
                    imagesfeedsList.add(child.child("address").getValue(String.class));
                    authorfeedsList.add(child.child("author").getValue(String.class));
                }
                Log.i("MyTag_imagesDirFinal", imagesfeedsList.toString());

                mImages = imagesfeedsList.toArray(new String[imagesfeedsList.size()]);
                author = authorfeedsList.toArray(new String[authorfeedsList.size()]);

Answer 1

好吧，稍微深入研究一下 stackoverflow 丰富的内容，发现这个post 与我想要实现的目标相似。以及我能够生成的代码；

     try{
            String url1 = mImages[position];
            URL ulrn = new URL(url1);
            HttpURLConnection con = (HttpURLConnection)ulrn.openConnection();
            InputStream is = con.getInputStream();
            Bitmap bmp = BitmapFactory.decodeStream(is);
            if (null != bmp)

                Palette.generateAsync(bmp, new Palette.PaletteAsyncListener() {
                    public void onGenerated(Palette palette) {
                        int bgColor = palette.getVibrantColor(mContext.getResources().getColor(android.R.color.black));
                        holder.placeNameHolder.setBackgroundColor(bgColor);
                    }
                });
            else
                Log.e("MyTag_BMP","The Bitmap is NULL");

        }catch (Exception e){

        }

虽然在我的代码中，.getColor 已被弃用？我不知道为什么和结果，几乎是我所期望的。希望对代码进行任何评论以纠正可能出现的问题？