Here are some excellent android open source projects for your reference and thanks to the selfless authors

1.recyclerview - 拖拽，滑动，head，footer简单实现
2.recyclerview - 卡片，滑动到中间时放大
3.自定义view - 绘制渐变色圆形
4.Appbarlayout 嵌套动态改变 toolbar