android - 反复设置recyclerview项目背景色

Question

我试图在 cardview 中设置不同的背景颜色，但它不起作用我有包含颜色的颜色数组

public class DashboardAdapter extends RecyclerView.Adapter<DashboardAdapter.MyViewHolder> {
    private Context mContext;
    private List<String> leavetypeList;
    private List<String> leavebalanceList;

    public String[] mColors = {
            "3F51B5","FF9800","009688","673AB7"
    };


    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView leavecount,leavename;
        public ImageView thumbnail;
        public RelativeLayout rlauthor;
        CardView cardView;
        View viewline;

        public MyViewHolder(View view) {
            super(view);
            leavecount = (TextView)view.findViewById(R.id.tvleavenumber);
            leavename = (TextView)view.findViewById(R.id.tvleavetype);
            cardView=(CardView) view.findViewById(R.id.cdvdashboard);
        }
    }

    public DashboardAdapter(Context context, List<String> leavetypeList,List<String> leavebalanceList) {
        this.mContext = context;
        this.leavetypeList = leavetypeList;
        this.leavebalanceList = leavebalanceList;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.raw_dashboard, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {
        Typeface tf;
        tf = Typeface.createFromAsset(mContext.getAssets(), "fonts/HKNova-Medium.ttf");
        holder.leavecount.setTypeface(tf);
        holder.leavename.setTypeface(tf);

        holder.leavecount.setText(leavebalanceList.get(position));
        holder.leavename.setText(leavetypeList.get(position));

        String color="#"+mColors[position];

        for(int c=1;c<mColors.length;c++)
        {

            holder.cardView.setCardBackgroundColor(Color.parseColor(color));

            if(c==mColors.length)
            {
                 c=1;
            }
        }


    }

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

我想要这种类型的输出，但只得到最后一种颜色，如果颜色完成而不是显示其他项目背景颜色从颜色 [0] 位置开始

非常感谢任何帮助

Answer 1

它不会那样工作。您需要将此逻辑放在 onBindViewHolder 中，您可以在其中借助 position 更改颜色。像这样使用

public String[] mColors = {"#3F51B5","#FF9800","#009688","#673AB7"};

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    holder.itemView.setBackgroundColor(Color.parseColor(mColors[position % 4])); // 4 can be replaced by mColors.length
}

看看我是如何用 # 前缀重新定义 mColors 数组的。所以需要在计算颜色的时候加上#。