mp3DirectCut, the popular desktop MP3/AAC audio editor, is now available on Android. Direct editing without re-encoding allows to cut, crop, extract, join, and on MP3 also to fade (Ad-free) : r/Android
MP3 Cutter and Ringtone Maker - Apps on Google Play
Mp3 Cutter and Ringtone Maker:Amazon.com:Appstore for Android
Music Audio Editor, MP3 Cutter - Apps on Google Play