Missing attributes in layout editor in Android Studio

This worked for me.

• Exit android studio then make the below changes.

• Go to C:\Users\UserName.android and rename the build-cache folder to build-cache.bak

• Go to C:\Users\UserName.AndroidStudio3.2\system and rename these folders

  caches to caches.bak

  compiler to compiler.bak

  compile-server to compile-server.bak

  conversion to conversion.bak

  external_build_system to external_build_system.bak

  frameworks to frameworks.bak

  gradle to gradle.bak

  resource_folder_cache to resource_folder_cache.bak

• Open the Android Studio and open your project again.

No IDEA annotations attached to the JDK 1.8 (C:\...), some issues will not be found

This happened to me today. It was very frustrating, my entire gradle got messed up for unknown reason. in build.gradle (Module: app), I had issues with

implementation 'com.android.support:appcompat-v7:28.0.0' .

I chose to suppress the warning at first, and they put

//noinspection GradleCompatible 
implementation 'com.android.support:appcompat-v7:28.0.0'

for me... Anyways, I replaced above line with

implementation 'com.android.support:appcompat-v7:26.1.0'

and changed my compileSdkVersion to 26 and the attributes in layout editor came back alive. so I guess that appcompat thing has to do with the layout editor.

Down of the activity_main.xml window there is "Design" tab and "Text" tab. Click on design tab, select an item and voila: attributes window is on the right

I had to delete all android studio files (not just uninstall and except your projects). I didn't try Raynold's solution, so if you have any problem you can try it before deleting all the files.

Starting with Android Studio 3.0.1, all the fields from the Properties panel can now be found under the Attributes by selecting:

View all attributes