Android obtains the project static resource files, and dynamically sets the background and other operations for the layout controls of the activty page

My application scenario is to get the LinearLayout of the entire page to set the background. When the page has no data, add a background image to the page, setBackground() to set the background image of the page:
look at the code! ! !

 //获取项目中的静态资源文件
        Resources resources = getContext().getResources();
//获取项目静态文件下的图片
 Drawable drawable = resources.getDrawable(R.drawable.ic_clean_history);
 
//历史图片存量小于0设置图片，大于0设置颜色(判断是否有数据给activty页面的进行动态设置背景)
//llHistory 为xml页面的一块布局
        if (mSPHistoryImgList != null) {
    
    
            if (mSPHistoryImgList.size() > 0) {
    
    
                llHistory.setBackgroundColor(Color.parseColor("#f4f4f4"));
            } else {
    
    
                //获取资源目录,没有历史图片的时候加背景图片说明
                llHistory.setBackground(drawable);
            }
        } else {
    
    
            llHistory.setBackgroundColor(Color.parseColor("#f4f4f4"));
        }

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