Which Audio Format would be best for me to store audio files on Android Smartphone?

Question

I am developing an Android based application which plays Audio Files from an Album. The audio files in the album are all in MP3 Format with Audio BitRate 320 KBPS. Since there are 18 songs in the album and the average song size is 6MB, my Android APK size is approx 110MB.

I wanted to ask which Audio Format would be best for me which reduces the APK Size without significantly reducing the Audio Quality ? Any help would be greatly appreciated.

Thanks.

Answer 1

Best used are aac and mp3 I prefer mp3 but Shahab is right aac would work