Question

浏览网站其他教程找到了一个很好的选择，将材料设计应用到Android应用程序，这是根据卡片中查看的图片选择cardView动作区域颜色。

在this toturial中，他们将图像从drawable导入到ciew中，我从网站上检索它，通过创建图像地址的arrayList，然后使用picasso将其提供给cardView几乎与教程类似，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中的图片下的动作区域）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？

我很感激有关如何实现这一目标并理解该方法的任何指示？

在Activity_details教程中

   @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);
            }
        });
    }

不同之处在于我的资源是;

          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，有点潜入stackoverflow丰富的内容，发现这个post类似于我想要实现的目标。和我能够生成的代码;

     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？我不确定为什么和结果，几乎是我所期待的。会不会对代码的任何评论表示感谢，以纠正可能出现的问题？

如何使用Palette API动态生成颜色？

1 个答案: