Android Question Camera.PreviewToJPEG

Cableguy · Feb 4, 2016

Hi Guys,

I have searched the forum but found nothing directly or even remotely related to this subject...

I have an "almost done" app, in which I decided to add a last minute feature...
I'm using camera along with cameraEx, and I want to capture a still frame, but not saving it...
From all I could gather from the camera lib docs, this method may do what I need... but...
How do I use it??

Cam.PreviewImageToJpeg(GetDeviceLayoutValues() as Byte, quality as Int) as Byte()

please help

DonManfred · Feb 4, 2016

Based on the source i can see (camEx class);

something like

B4X:

Sub Camera1_PictureTaken (Data() As Byte)
    Dim jpg() As Byte = camEx.PreviewImageToJpeg(Data,100)
    'save the bytearray to a file now if you want

i guess

Cableguy · Feb 4, 2016

As I said, I do not want to save the resulting image, only to make it "still" on screen.... how would I apply that byte array to an image?

DonManfred · Feb 4, 2016

Cableguy said:
how would I apply that byte array to an image?

it is not really working for me using Previewimagetojpg....

But if i use the data array in the picture taken event then i can get it work with

B4X:

Sub Camera1_PictureTaken (Data() As Byte)
    'Dim jpg() As Byte = camEx.PreviewImageToJpeg(Data,100)
    Dim inps As InputStream
    inps.InitializeFromBytesArray(Data,0,Data.Length)
    Dim bmp As Bitmap
    bmp.Initialize2(inps)
    inps.Close
    ImageView1.Bitmap = bmp

Cableguy · Feb 4, 2016

Thanks Don,

I had found a snippet that uses the same principle... Indeed, I first have to call "takePicture" in order to get the data in the picturetaken event...
I never really worked with byte streams, so I was a bit lost.

Thanks for taking the time to help me

JordiCP · Feb 5, 2016

Hi

If you just want to freeze the image, you can call CamEx.stopPreview

If you need the bitmap of the still image to process it or whatever, you can take a look here , and instead of calling it in every preview frame (as it is done in the example), call the routine only once when you want a "photo" of the preview, and show it on top of the preview panel

francoisg · Oct 25, 2016

Hi guys, I urgently need help.

I need to be able to get the image from the preview event as an image (jpg/bmp).

My issue is that the device I need to use is Android 2.2! Which means no CameraEx :-(

Any help would be greatly appreciated!!!

Android Question Camera.PreviewToJPEG

Cableguy

Expert

DonManfred

Expert

Cableguy

Expert

DonManfred

Expert

Cableguy

Expert

JordiCP

Expert

francoisg

Active Member

Similar Threads

Android Question Camera.PreviewToJPEG

Cableguy

Expert

DonManfred

Expert

Cableguy

Expert

DonManfred

Expert

Cableguy

Expert

JordiCP

Expert

francoisg

Active Member

Similar Threads

Privacy & Transparency

Privacy & Transparency