I selected an id in XML, mouse right click, find Usage shows no occurrence of id even Id exist in java file. And if i do the same in Mac its finding it.
So is there any cache issue or something else ?
To fix the autocomplete go to:
File -> Invalidate Caches -> Restart -> Click at Invalidate and Restart
I was having the same problem and unfortunately @josedlujan's answer does not solve the problem.
Alternatively, you my try the Ctrl+Shift+F to certainly find what you want, also double clicking Shift will open a quick dialog to find certain keyword in the whole project.
In my case I was not finding anything since I had "File name Filter" checked and I was just looking in build.gradle.
There are two options to resolve the problem:
1. Uncheck option "File name Filter" or,
2. Just filter to *.java or whatever type of file you want
Another reason why that shortcut is not working is that, probably you GEFORCE EXPERIENCE is using that shortcut, which happened to my system: Remove that shortcut in your GEFORCE EXPERIENCE
I learned that from the following link:
https://intellij-support.jetbrains.com/hc/en-us/community/posts/206845105/comments/115000444830
来源：https://stackoverflow.com/questions/28859441/find-usage-of-id-not-working-in-android-studio-on-windows