New location in Android Studio 3.6+
View > Tool Windows > Gradle from the menu bar.
Then, near the top of the Gradle window, click Toggle Offline Mode Gradle offline button in the Gradle panel.
Old answer
On Windows:-
Go to File -> Settings.
And open the 'Build,Execution,Deployment'
. Then open the
Build Tools -> Gradle
Then uncheck -> Offline work on the right.
Click the OK button.
Then Rebuild the Project.
On Mac OS:-
go to Android Studio -> Preferences, and the rest is the same.
OR follow steps given in the image
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