RangeDownloader uses http range feature to download the file in chunks. It will resume the download from the previous point, even if the app was previously killed.
It first sends a HEAD request to test whether this feature is supported.
Note that you need to delete the target file if you want to restart the download.
Supported by: B4A, B4i and B4J.
Usage example:
B4X:
Sub Class_Globals
Private Root As B4XView
Private xui As XUI
Private Downloader As RangeDownloader
Private AnotherProgressBar1 As AnotherProgressBar 'XUI Views
Private url As String = "https://sabnzbd.org/tests/internetspeed/20MB.bin"
Private Label1 As B4XView
End Sub
Public Sub Initialize
End Sub
'This event will be called once, before the page becomes visible.
Private Sub B4XPage_Created (Root1 As B4XView)
Root = Root1
Root.LoadLayout("MainPage")
xui.SetDataFolder("Download large file")
Downloader.Initialize
Dim tracker As RangeDownloadTracker = Downloader.CreateTracker
Track(tracker)
Wait For (Downloader.Download(xui.DefaultFolder, "test2.zip", url, tracker)) Complete (Success As Boolean)
Log("Complete, success = " & Success)
AnotherProgressBar1.Visible = False
End Sub
Private Sub Track (Tracker As RangeDownloadTracker)
Do While Tracker.Completed = False
Sleep(100)
Label1.Text = $"$1.2{Tracker.CurrentLength / 1024 / 1024}MB / $1.2{Tracker.TotalLength / 1024 / 1024}MB"$
AnotherProgressBar1.Value = Tracker.CurrentLength / Tracker.TotalLength * 100
Loop
End Sub
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