Android Studio – Auto complete and other features not working

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#1 From Build menu (of your Android Studio), click Rebuild Project option.

#2 Then once rebuild completes, go to File > Invalidate Caches / Restart... and Click on Invalidate an Restart button.

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This really works for me.

Source: https://code.google.com/p/android/issues/detail?id=61844#c4

#1 Rebuild is required, because Android-Studio does simply rely solely on Gradle’s build-result (without static-analysis support, at least at time of writing, 2022).

#2 Clearing cache is required, because the previous build-result (before above rebuild) may be indexed, which makes Android Studio ignore latest Gradle build-result
(this is a very good speed optimization, but a very bad Developer-experience as well).

There can sometimes be other reasons too, which is why there are many other answers posted here.

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