Android Question Media Player is not working

[evan_2026]

‌I wrote some code, and it looks very good. But nothing happend, no sound,no error report.
Please help me take a look.
My phone is Samsung
Android 8.1

 

[Erel]

Use File - Export as zip to create the zip (with non-B4XPages projects).

The media file isn't included. Maybe it isn't supported by Android.

 

[evan_2026]

I'm terribly sorry. I made a silly mistake. My phone is linked to headset.
There is no sound from the phone's external speaker. Now,It's ok.