Resolving Problems With Android Studio Freezing Constantly

Android studio freezes whenever it tries to suggest method and class

It turned out that some class was causing problem, this class is java with generics. T in generic requires to extend Enum and implement my other class, this seems to cause Android Studio freeze. I'm trying to find a way to reproduce, but solved it by creating static java method which handles my codes. Only Kotlin is causing freezings.

Android Studio freezes when opening project on Ubuntu

In case of misconfiguration, closing Android Studio and deleting .AndroidStudio3.1 configuration folder may help.

Find your configuration files | Android Developers

In some similar scenarios of misconfiguration deleting .idea folder might help.

Android Studio freezes on indexing

I had today this exact problem. None of the above helped me until I found simple solution here
Just run File -> Invalidate Cache and Restart
That simple and it works!!!

Android Studio 3.0 Beta freezing constantly on macOS Sierra

Do this:

Remove all Android Studio's.
Install JUST Android Studio 2.3.3 stable.

Note: check your oracle jdk version, Im using 1.8.0_131 but it looks like with 1.8.0_144 works too.

Android Studio 3.1 : updating gradle file cause android studio to freeze

jcenter is having issues so when you get your project to build correctly the once enable offline-mode so AS don't have to connect to jcenter every gradle refresh.

see this question for more info.