First off, Android Studio is a great IDE; if you haven’t used it and you want to get into Android development, I highly, highly recommend it.

Failure to Install APK [INSTALL_FAILED_DEXOPT] Android Studio

Anyways, ever seen the error above? There are a lot of Stack overflow posts on this issue, but I’d like to share what worked for me.

Turns out that when this happened to me the sdk my project was using was different than the one Android Studio was using. Once I made them the same and rebuilt/cleaned the project it worked like a charm. So make sure these things match!

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