To go back and forward the song with the back and forward arrows on mp3 player

[Melody_Lozano_Ruiz]

Mainly I did my work through screens (I put a song on the player and another player with another song on the other screen), anyway, now it's complicated because the songs are selected from the SD, and I don't know how to apply that in my program

sorry for my bad English

[Taifun]

@Melody_Lozano_Ruiz

Mainly I did my work through screens (I put a song on the player and another player with another song on the other screen)

let me suggest you to use only one screen... just set the source of the player accordingly, see also Building Apps with Many Screens

see the Jukebox example how to play serveral files in random order here App Inventor Extensions: File | Pura Vida Apps
the example provides all available songs in a list called listMusic... you could adjust the example by using an index variable and just increment the index variable to pick the next file form the list

A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook http://www.appinventor.org/book2 ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here http://www.appinventor.org/content/CourseInABox/Intro and the aia files for the projects in the book are here: http://www.appinventor.org/bookFiles
How to do a lot of basic things with App Inventor are described here: http://www.appinventor.org/content/howDoYou/eventHandling .

Also do the tutorials Our Tutorials! to learn the basics of App Inventor, then try something and follow the Top 5 Tips: How to learn App Inventor

Taifun

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Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.

[Melody_Lozano_Ruiz]

@Taifun Su información fue muy útil, logré hacer que mis canciones fueran como en el reproductor, y avanzar...