圆形，商用复杂布局，图片缩放等各种控件或示例（GitHub 等）目录

1 CircleImageView 圆形 

https://github.com/hdodenhof/CircleImageView

https://blog.csdn.net/weixin_43499030/article/details/92799689

2商用复杂布局 （商用的）

https://blog.csdn.net/qq_34501274/article/details/71194958

https://blog.csdn.net/liaoinstan/article/details/52671101

3.图片缩放

PhotoView  https://github.com/chrisbanes/PhotoView

4.监听软键盘关闭 

https://blog.csdn.net/johnny901114/article/details/51471729

5.谷歌官方的示例

https://developer.android.google.cn/samples/

6.java中检查字符串是否是有效的json

https://stackoverflow.com/questions/10174898/how-to-check-whether-a-given-string-is-valid-json-in-java

7.BRVAH是一个强大的RecyclerAdapter框架 BRVAH官方使用指南

https://www.jianshu.com/p/b343fcff51b0/

支持下拉刷新的RecyclerView

https://github.com/Trinea/android-open-project

8.Android标题栏（TitleBar）绝佳解决方案

https://www.jianshu.com/p/617be02dc265?tdsourcetag=s_pctim_aiomsg

9.10款Android界面设计

https://blog.csdn.net/jongde1/article/details/79170621

10.MPAndroidChart 折线图

https://github.com/PhilJay/MPAndroidChart