What are the differences of apk from Eclipse and Android Studio[IntelliJ IDEA] is there more security in Android Studio build?
3 Answers
Android Studio utilizes the fast growing Gradle build system. It builds on top of the concepts of Apache Ant and Apache Maven but it also introduces a Groovy DSL (Domain-Specific Language)
that allows for scripted builds which opens up many automation possibilities like uploading your beta .apk to TestFlight for testing.
Eclipse on the other hand uses Apache Ant as its main build system which a very robust XML based build system .
Please check this SO Answer
ADT (Eclipse) vs. Android Studio: How much APK file size difference is normal?
Conclusion
Both are identical.But i prefer Android Studio.

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https://infinum.co/the-capsized-eight/articles/eclipse-is-dead-for-android-development-and-i-helped-kill-it – IntelliJ Amiya Sep 05 '15 at 05:53
They both use the Android SDK to generate the APKs, they should be identical.

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Code protection (security by obfuscation) is done with ProGuard both on Android Studio and on ADT (Eclipse). So if you use ProGuard, there should be no difference.

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