In Android Studio try from top menu:
(在Android Studio中,从顶部菜单尝试:)
VCS->Local History -> Show Local History
(VCS->本地历史记录->显示本地历史记录)
First, you should select top folder of your project.
(首先,您应该选择项目的顶层文件夹。)
You can revert to old version, when everything was fine
(一切正常后,您可以恢复为旧版本)
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…