java - 如何在运行时了解布局背景和更改文本颜色 android studio

Question

大家好，我正在开发一个在运行时设置每个项目背景颜色的应用程序，我的默认文本颜色是黑色，但如果背景也是黑色，我看不到我的文本，请问我怎么知道的背景颜色运行时回收器视图中的一个项目，如果太暗，相应地更改文本颜色使文本颜色反之亦然

这是我编写的实用程序类 `public class Utils {

//    ColorDrawable colorDrawable = new ColorDrawable()
private static ColorDrawable colorDrawable[] = {

        new ColorDrawable(Color.parseColor("#2e86c1")),
        new ColorDrawable(Color.parseColor("#6c3483")),
        new ColorDrawable(Color.parseColor("#239b56")),
        new ColorDrawable(Color.parseColor("#641e16")),
        new ColorDrawable(Color.parseColor("#58d68d")),
        new ColorDrawable(Color.parseColor("#7e5109")),
        new ColorDrawable(Color.parseColor("#17202a")),
        new ColorDrawable(Color.parseColor("#7d3c98")),
        new ColorDrawable(Color.parseColor("#d2b4de")),
        new ColorDrawable(Color.parseColor("#f39c12")),
        new ColorDrawable(Color.parseColor("#154360")),
        new ColorDrawable(Color.parseColor("#641e16")),
        new ColorDrawable(Color.parseColor("#145a32")),


};

public static ColorDrawable getRandomColor() {
    int r = new Random().nextInt(12);

    return colorDrawable[r];
}

} the adapter class 公共类 NoteAdapter 扩展 ListAdapter<Note, NoteViewHolder> {

Context context;
public static final int TYPE_ADS = 0;
public static final int TYPE_NORMAL = 1;

int clickCount = 0;

public NoteAdapter(Context context) {
    super(itemCallback);
    this.context = context;
}

static DiffUtil.ItemCallback<Note> itemCallback = new DiffUtil.ItemCallback<Note>() {
    @Override
    public boolean areItemsTheSame(@NonNull Note oldItem, @NonNull Note newItem) {
        return oldItem.getClass().equals(newItem.getClass());
    }

    @Override
    public boolean areContentsTheSame(@NonNull Note oldItem, @NonNull Note newItem) {
        return oldItem.equals(newItem);
    }
};

@NonNull
@Override
public NoteViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    LayoutInflater inflater = LayoutInflater.from(viewGroup.getContext());

    holder.binding.re.setBackground(Utils.getRandomColor());

    final Note note = (Note) getItem(position);

    if (note != null) {
        holder.binding.setNote(note);
    }


    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if (clickCount == 3) {
                // show ads
                showAds.booleanMutableLiveData.setValue(true);
                clickCount = 0;
            } else {

                clickCount += 1;

                Intent intent = new Intent(context, NoteDetailActivity.class);
                intent.putExtra("subject", note.getSubject());
                intent.putExtra("body", note.getBody());
                intent.putExtra("date", note.getDate());
                intent.putExtra("priority", note.getPriority());
                intent.putExtra("id", note.getId());
                context.startActivity(intent);
            }
        }
    });
}   

public Note note(int position) {
    return (Note) getItem(position);
}

class ViewHolder extends RecyclerView.ViewHolder {

    NoteItem2Binding binding;

    public ViewHolder(@NonNull NoteItem2Binding binding) {
        super(binding.getRoot());

        this.binding = binding;

    }
}

} `

标签： javaandroidandroid-studioandroid-recyclerview