Android Question Need to save created QRcode to image file

microbox · Jan 20, 2021

Hi everyone, I have a snippet code that will create a qr code. But now I need to save it as image file. Can anyone kindly point the way how to do it?
The following is what I'm using so far.

B4X:

Sub qrCreator(vfname As String)
    Dim qr As QRGenerator
    qr.Initialize(ImageView1.Width)
    ImageView1.SetBitmap(qr.Create(vfname))
    Log("created!")
    
    ' I can not make the code below run properly
    
    'Dim imgPreview As ImageView
    'imgPreview.Initialize("")
    'Dim b As Bitmap
    'b.Initialize(File.DirRootExternal , vfname & ".jpg")
    'b = imgPreview.Bitmap
    'Dim out As OutputStream
    'out = File.OpenOutput(File.DirRootExternal & "/" & AppName, vfname & ".jpg", False)
    'b.WriteToStream(out, 100, "JPEG")
    'out.Close
End sub

Mahares · Jan 20, 2021

You shouldn't comment the code that gave you trouble. You should run it and log the error and show it. You are using File.DirRootExternal. Try
File.DirInternal. This thread looks like runtime permission problems plastered all over it.

microbox · Jan 20, 2021

Thank you for the reply @Mahares. I change the code and now works fine.

B4X:

Dim img As Bitmap
    Dim qr As QRGenerator
    qr.Initialize(ImageView1.Width)
    Log("created!")
    
    ImageView1.BringToFront
    ImageView1.Visible = True
    img = qr.Create(vfname)

    ImageView1.SetBitmap(img)
    '-----------------------------
    Dim out As OutputStream
    out = File.OpenOutput(File.DirRootExternal & "/" & AppName, vfname & ".jpg", False)
    Log("it pass this line")
    img.WriteToStream(out, 100, "JPEG")
    out.Close

Erel · Jan 21, 2021

Avoid using File.DirRootExternal unless you must. It is becoming more and more difficult to access it.

microbox · Jan 25, 2021

Erel said:
Avoid using File.DirRootExternal unless you must. It is becoming more and more difficult to access it.

Thanks Erel...noted.

Android Question Need to save created QRcode to image file

microbox

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Mahares

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microbox

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Erel

B4X founder

microbox

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