Android studio design editor is unavailable until after a successful project sync

问题

what is the actual root cause of this issue? I already sync with gradle files but eventually failed.

回答1:

Just sync your project with gradles. File --> Sync Project with Gradle Files

回答2:

1. Build -> Clean Project
2. Build -> Rebuild Project

3. File -> Sync project with gradle files . If not worked then try

   File -> Invalidate Caches / Restart .

It's work for me !!!

回答3:

That could be fixed in one or two steps, depending on how nice is Android Studio today:

1. Try to sync your project with gradle files:

2. If that doesn't work, invalidate Android Studio caches and restart. That should fix the problem:

The reason behind the first solution not working could be related on gradle cached dependencies problems, but who knows 🤷

回答4:

Issue happened to me when I changed the res>values>styles.xml

What I change was
"Theme.AppCompat.Light.DarkActionBar" --->>> "Base.Theme.AppCompat.Light.DarkActionBar"

Solutions I tried.

1. Build -> Rebuild Project (Not worked)
2. Close all files and Open again. Then Build -> Clean Project (Not worked) File -> Sync project with gradle files (Not worked)
3. Close the Android Studio while project still opened. Opened it again. - It Worked.

回答5:

Just you have to do >> open File --> Sync Project with Gradle Files and then after >> open File --> invalidate Android Studio caches / restart so done this problem.:)

回答6:

If nothing of the above steps work, Then simply undo the changes that you have recently made, and then build gradle. In my case, I have added one dependencies and this problem raised, so I removed that dependencies build the gradle and then again add it. Problem Solved..!!

来源：https://stackoverflow.com/questions/53195701/android-studio-design-editor-is-unavailable-until-after-a-successful-project-syn