安卓学习（1）jdk安装和配置

https://www.cnblogs.com/iceb/p/7561752.html jdk安装和配置
https://blog.csdn.net/ZMS_JAMES/article/details/79937750 Android sdk安装和studio关联
sdk安装：https://www.cnblogs.com/summary-2017/p/8073225.html