Android : APK generated in Gradle not replacing APK generated from native android

Question

I just moved my native android application to gradle. Now if i generate the signed APK using same signature that i used for native.I get a different application in my phone. (it's not replacing the old one - native APK) So i see 2 applications with same name. I checked and the package name hasn't changed. What could be causing this ?

Any suggestions ? Or is it something i need to deal with since i migrated to gradle. Any input will be very helpful.

edit 1 : Thanks for all your replies. I am adding my old Intellij IDEA build manifest and new Android Studio Gradle Build file . Please check and let me know what changes i need to do.

The old intellij idea manifest is :

Answer 1

Check your build.gradle, defaultConfig, productFlavors and buildTypes.

http://tools.android.com/tech-docs/new-build-system/applicationid-vs-packagename