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I was working on a project, and then I got a prompt to update Android Studio. After I did that, I started getting this error when trying to run my app 
It says
The project may need to be synced with Gradle files
How do I solve this?
721
gradle file and then click on Open for Editing with Android Studio at the top right. This will open just the Android project in a new Android Studio window and you will be able to see all the Gradle commands then (for example, under File > Sync...).
Gradle files and your application code need to be synced if any Gradle file changes, for example when updating dependencies or adding new dependencies manually. Android Studio should automatically sync the project with Gradle when you robotify your app (ie make it compatible with Pepper's tablet).
It could be that you are using gradle in offline mode. To uncheck it go to File > Settings > Gradle , uncheck the Offline Work checkbox, and click Apply Make sure you have internet connection and sync the project again.
From 4 min to 1 min.
EDIT
Starting with Android Studio 3.1, you should go to:
File -> Sync Project with Gradle Files
OLD
Clicking the button 'Sync Project With Gradle Files' should do the trick:
Tools -> Android -> Sync Project with Gradle Files
If that fails, try running 'Rebuild project':
Build -> Rebuild Project
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Old Answer
When trying to run the application, instead of selecting the directory highlighted here in blue
I selected the subdirectory instead
and clicked "run".All the issues with Gradle are automatically resolved and the missing apk directory is automatically created.
New Solution
The Sync project with gradle files button disappeared from Android Studio for a while.Its back and you can find it here:
hit the button and wait for the task to complete
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