Android Question CameraKit library - Saving captured bmp to photo gallery as a jpg

rleiman · Dec 11, 2019

Greetings,

I would like to send the photo I capture using the CameraKit library to the photo gallery and / or to a specified folder on the user installed sd card. The captured photo is a bmp.

This is the coding from the sample that comes with the library:

B4X:

Sub CameraKit_onImage(image() As Byte)
    Log($"CameraKit_onImage(${image.Length} Bytes)"$)
    Dim inpstr As InputStream
    inpstr.InitializeFromBytesArray(image,0,image.Length)
    Dim bmp As Bitmap
    bmp.Initialize2(inpstr)
    imgcapture.Bitmap = bmp
    imgcapture.Visible = True
    Sleep(1500)
    imgcapture.Visible = False
End Sub

I plan on adding the needed code to this sub routine.

drgottjr · Dec 12, 2019

there's a good post here:
https://www.b4x.com/android/forum/threads/externalstorage-access-sd-cards-and-usb-sticks.90238/
about accessing the sdcard. comes with a class module to facilitate things.

if you're thinking of writing to external storage on the device, you'll need a runtime permission.
see here:
https://www.b4x.com/android/forum/threads/runtime-permissions-android-6-0-permissions.67689/
you add a couple lines to the manifest and to the app. clear and easy.

by gallery, i assume you mean the usual DCIM/Camera folder. if you're thinking about trying to write to another app's internal folder, that's a different story. for that, you'd need to use an intent to share with fileprovider (assuming the other app can accept shared files):
https://www.b4x.com/android/forum/threads/sharing-files-from-your-app-with-file-provider.70458/

you might want to think about separating these actions from your referenced sub and, perhaps, from each other by passing the bitmap (or possibly saving it locally first)

rleiman · Dec 12, 2019

drgottjr said:
there's a good post here:
https://www.b4x.com/android/forum/threads/externalstorage-access-sd-cards-and-usb-sticks.90238/
about accessing the sdcard. comes with a class module to facilitate things.

if you're thinking of writing to external storage on the device, you'll need a runtime permission.
see here:
https://www.b4x.com/android/forum/threads/runtime-permissions-android-6-0-permissions.67689/
you add a couple lines to the manifest and to the app. clear and easy.

by gallery, i assume you mean the usual DCIM/Camera folder. if you're thinking about trying to write to another app's internal folder, that's a different story. for that, you'd need to use an intent to share with fileprovider (assuming the other app can accept shared files):
https://www.b4x.com/android/forum/threads/sharing-files-from-your-app-with-file-provider.70458/

you might want to think about separating these actions from your referenced sub and, perhaps, from each other by passing the bitmap (or possibly saving it locally first)

Thanks for the very usefull links. I will be going over them tomorrow.

DonManfred · Dec 12, 2019

rleiman said:
or to a specified folder on the user installed sd card

Code to write the bytes.
https://www.b4x.com/android/forum/threads/b4x-bytes-to-file.70111/#content

rleiman · Dec 12, 2019

Hi Everyone,

Thanks for all the replies and helpful links.

Android Question CameraKit library - Saving captured bmp to photo gallery as a jpg

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