SetBackGroundColor 在 CardView 中不起作用

Posted 2023-03-16

【中文标题】SetBackGroundColor 在 CardView 中不起作用

【英文标题】：SetBackGroundColor doesn't work in CardView

【发布时间】：2022-01-20 21:57:22

【问题描述】：

大家好，请帮帮我！！！

我想在 RecyclerView 中更改 CardView 颜色。

Here is the result, but I want to change different color for each CardView

这是我在 onBindViewHolder 中的代码

    public void onBindViewHolder(@NonNull CardViewHolder cardViewHolder, int i)
        Course course = getListCourses().get(i);
        cardViewHolder.tvCourseTitle.setText(course.getCourseTitle());
        cardViewHolder.tvCourseShortDescription.setText(course.getCourseShortDescription());
        cardViewHolder.imgCourse.setImageResource(course.getCourseImage());
        cardViewHolder.cardView.setCardBackgroundColor(Color.parseColor(course.getCourseColor()));
    

    @Override
    public int getItemCount()
        return getListCourses().size();
    
    public class CardViewHolder extends RecyclerView.ViewHolder
        private ImageView imgCourse;
        private TextView tvCourseTitle, tvCourseShortDescription;
        private CardView cardView, cardViewContainer;


        public CardViewHolder (@NonNull View itemView)
            super(itemView);
            imgCourse = itemView.findViewById(R.id.img_item_course);
            tvCourseTitle = itemView.findViewById(R.id.tv_item_title);
            tvCourseShortDescription = itemView.findViewById(R.id.tv_item_short_description);
            cardView = itemView.findViewById(R.id.cardView_background);
            cardViewContainer = itemView.findViewById(R.id.container);
        
    

这是Java.lang中的代码

    String courseTitle, courseShortDescription, courseColor;
    int courseImage;

    public Course(String title, String description, int image, String color)
        this.courseTitle = title;
        this.courseShortDescription = description;
        this.courseImage = image;
        this.courseColor = color;
    

    public String getCourseTitle() 
        return courseTitle;
    

    public void setCourseTitle(String courseTitle) 
        this.courseTitle = courseTitle;
    

    public String getCourseShortDescription() 
        return courseShortDescription;
    

    public void setCourseShortDescription(String courseShortDescription) 
        this.courseShortDescription = courseShortDescription;
    

    public String getCourseColor() 
        return courseColor;
    

    public void setCourseColor(String courseColor) 
        this.courseColor = courseColor;
    

    public int getCourseImage() 
        return courseImage;
    

    public void setCourseImage(int courseImage) 
        this.courseImage = courseImage;
    

注意当我使用方法 cardViewHolder.cardView.setCardBackgroundColor(Color.parseColor(course.getCourseColor())); , 应用被毁了

【参考方案1】：

每个卡片视图的颜色不同，您可以在您的onBindViewHolder() 中使用这样的条件设置

   if (course.getCourseTitle().equalsIgnoreCase("Hello android"))
        cardViewHolder.cardView.setBackgroundColor(R.color.teal_200);
     else if (course.getCourseTitle().equalsIgnoreCase("Hello Python"))
        cardViewHolder.cardView.setBackgroundColor(R.color.teal_700);
    else if (course.getCourseTitle().equalsIgnoreCase("Android Basic"))
        cardViewHolder.cardView.setBackgroundColor(R.color.design_default_color_error);