Android Question error while playing video

[Makumbi]

the error comes here

Error: com.google.android.exoplayer2.upstream.HttpDataSource$HttpDataSourceException: Unable to connect to http://kccug.com/KabojjaApp/lessons/good.mp4

but when i past it into my browser it plays without any problems.

i have a number of mp4 files that i want the user to ready direct from the server. but i would want it a way that the user selects a particular subject say english and then it show files available then he choices the file to be played. because in erel's example it is fixed a bit i wanted to just select a file then it is play please help how can i do this using b4x

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
        player1.Initialize("player")
        Dim sources As List
        sources.Initialize
        'sources.Add(player1.CreateUriSource("https://html5demos.com/assets/dizzy.mp4"))
        sources.Add(player1.CreateUriSource("http://kccug.com/KabojjaApp/lessons/good.mp4"))
        player1.Prepare(player1.CreateListSource(sources))
      
    End If
    Activity.LoadLayout("1")
    SimpleExoPlayerView1.Player = player1
    player1.Play
End Sub

 

[Erel]

Enable clear text communication: android.jar / targetSdkVersion / minSdkVersion