How do you read mp3 from sd card in mobile phone and play it?

[Anke]

All these paths points to the root directory of the external storage:

file:///storage/emulated/0/
/storage/emulated/0/
/mnt/sdcard/
/sdcard/

See also here:

Some basics on Android storage system

From an Android point of view there are an → Internal Storage and an → External Storage . 1. Internal Storage The Internal Storage can only be accessed with a rooted device. 1.1 The app package is saved in /data/data/<packageName>/ In order to be able to debug your app, AI2 saves the assets for → Companion on devices with Android ≥ 10 (API ≥ 29): /storage/emulated/0/Android/data/edu.mit.appinventor.aicompanion3/files/assets/ Android < 10 : /storage/emulated/0/Android/data/edu.mit…