I have built my android library package (aar) and the result of build is created in \"..\\app\\build\\outputs\\aar\" folder. The file within this folder is called \"app-deb
This issue of can already be handled with the answers like execute
./gradlew assembleRelease
or choose assembleRelease from Android Studio's Gradle menu. However, for completeness, with Android Studio 1.5.1 (and probably also older versions) building release version of a .aar can be accomplished by selecting Build->"Build APK" in Android Studio. It seems to execute assembleRelease. If your project only contains the library project, it does not ask for any signing information.