Disable the Instant Run option in Android Studio. Instructions are in the Android Studio Instant Run documentation. Instant Run tries to do hot swapping of your code; this causes the application class to be moved. To disable Instant Run Go to File –> Settings–> Build,Execution,Deployment –>Instant Run —> uncheck “Enable instant run”
Upgrade Android studio version to 3 or more. this bug is resolved. This was a bug on version 2.0 instant run and issues were reported check these links https://code.google.com/p/android/issues/detail?id=199884 https://code.google.com/p/android/issues/detail?id=195062 https://code.google.com/p/android/issues/detail?id=206698 https://code.google.com/p/android/issues/detail?id=209413 https://code.google.com/p/android/issues/detail?id=206627 thing to do would be to disable Instant Run entirely by Settings > Build, Execution, Deployment > Instant Run > Enable Instant … Read more
UPDATE In Android Studio Version 3.5 and Above Now Instant Run is removed, It has “Apply Changes“. See official blog for more about the change. we removed Instant Run and re-architectured and implemented from the ground-up a more practical approach in Android Studio 3.5 called Apply Changes.Apply Changes uses platform-specific APIs from Android Oreo and … Read more