Android Question Best way to download files

[Avansys]

Hello folks,

I've implemented Erel's code http://www.b4x.com/android/forum/threads/download-huge-files-with-httputils2.30220/ in my program to download different kind of files.

However, the program downloads files one by one to ensure that all files have been downloaded but I think it slows the proccess.

Is there an update to improve performace?

Thank's in advance.

The algorythm is the following:
1) Save DownloadData objects to a List
2) Verify if list contains objects. If true then download first file and every _Complete event program verifies if more objects exists in list. If true then download next file and so on,

 

[Erel]

Why don't you download them all at once?

 

[Avansys]

Do you have an example?

How can I ensure that all files are downloaded and ready to use?

 

[Erel]

Just create a HttpJob for each one of them and download it. If Job.Success is true then the download was successful. You can use a counter to track the progress.

 

[Avansys]

Dim dialogoAudio As DownloadData
            dialogoAudio.fileName = tempDialogoObject.identificador & ".mp3"
            dialogoAudio.url = Comun.ObtenerUrlParaAudios & tempDialogoObject.Audio
            dialogoAudio.EventName = "dialogoAudio"
            dialogoAudio.Target = Me
            mediaParaDescargarList.Add(dialogoAudio)
            'CallSubDelayed2(DownloadService, "StartDownload", dialogoAudio)

Then...

Sub dialogoAudio_Complete(job As HttpJob)
    Dim jobTagTemp As JobTag
    jobTagTemp.Initialize
    jobTagTemp = job.Tag
    Dim out As OutputStream
    Dim banderaObject As banderaObjeto
    banderaObject = BaseDatos.ObtenerBandera("almacenamiento")
    If banderaObject.valor = 1 Then
        out = File.OpenOutput(File.DirRootExternal & "/mybackpackguide/audios/dialogos", jobTagTemp.Data.fileName, False)
    Else
        out = File.OpenOutput(File.DirDefaultExternal & "/audios/dialogos", jobTagTemp.Data.fileName, False)
    End If
    File.Copy2(job.GetInputStream, out)
    job.Release
   
    ' Descargamos los archivos media
        contadorDeMediaParaDescargar = contadorDeMediaParaDescargar + 1
       
        If contadorDeMediaParaDescargar <= mediaParaDescargarList.Size Then
            ' Actualzamos el dialogo de progreso
                ProgressDialogHide
                ProgressDialogShow2("FILE " & contadorDeMediaParaDescargar & " of " & mediaParaDescargarList.Size, False)
               
            ' Obtenemos el objeto
                Dim tempDownloadData As DownloadData
                tempDownloadData = mediaParaDescargarList.Get(contadorDeMediaParaDescargar - 1)
               
            ' Descagamos
                CallSubDelayed2(DownloadService, "StartDownload", tempDownloadData)
        Else
            ' Actualizamos la bandera
                BaseDatos.ActualizarBandera("sync", Comun.ObtenerFechaActual, 1)
               
            ' Mostramos mensaje de confirmación
                StartActivity(Main)
                Msgbox("Updated finished.", "")
        End If
End Sub

Sub dialogoAudio_Progress(Progress As Long, Total As Long)
   
End Sub

That's what I have.. Is that correct? Just include a counter?

 

[Erel]

What is DownloadService?

 

[Avansys]

Your download service posted here: http://www.b4x.com/android/forum/threads/download-huge-files-with-httputils2.30220/

I Also have this error:
java.io.FileNotFoundException: /data/data/com.desarrollandoideas.backpackmexico/cache/12 (No such file or directory)

But not always.. any ideas?

 

[Erel]

Are you downloading very large files? If not then it is recommended to use the standard HttpUtils2 library.

This error usually happens when you don't check that Job.Success is true.