Android Studio没有检测到我最新版本的JDK，而是使用我的旧版本> :(

Ok so anyone answering please be aware that I am a complete beginner to all of this. But I have installed jdk1.8.0 because that is what the newest version of android studio needs, but when I open Android studio up, it says I still need to change it. So after a lot of research I made a new Java_Home variable and set the directory to where my jdk file was. I then went into android studio file, project structure, then changed that jdk directory as well. However, when I click ok, It still doesn't work, and when I go back to the project structure, it changes from jdk version 8, to my old jdk version 7 directory. For some reason it isn't saving :(. I would really appreciate some help here.Ok so anyone answering please be aware that I a