Develop Reference

connecting USB UVC camera with CameraX

I'm trying to make an android app that preview a stream from an external USB camera.
I can see the camera using UsbManager but for some reason, the CameraX doesn't list it in the connected camera list.
Does anyone have an idea how to fix this?
Also, I've downloaded for my android device some random app that allows streaming from a USB camera and it worked so I don't think it is a problem that the camera isn't compatible to work with an android device or something like that.

afaik CameraX doesn't support UVC cameras yet/still and Android doesn't provide a driver... for Android system UVC camera is just "some USB" device (as you noticed - handled by UsbManager) and you need to provide a driver by self...
so you can use some other libraries for getting UVC video, probably currently best is AndroidUSBCamera by jiangdongguo

Can I take a photo of my desktop through Android Emulator camera?

I'd like to capture my desktop through the back camera of my emulator. I'm aware that you can set it to use your computers webcam or even a remote camera but I haven't found any information on using the camera to take a photo on what is behind the emulator window.
The reason I'd like to do this is that I have a presentation to give of my app which is done over a desktop sharing session. So I cannot easily demonstrate with a genuine device.
I'd therefore like to be able to move one emulator over the other so that I may take a photo of a QR code that the second QR code generated.
Is this possible?
Cheers

I would suggest you use AirDroid and Vysor. Both of them are free, and can mirror your phone on the screen of your computer.

how to read and display image from a BLE device to Android app?

I am currently working on a project where i have to read and display an jpeg image (taken from a TI CC2541 BLE powered camera device) on an Android app which i have to develop. Using the official Android BLE Guide and some code online as reference i was able to setup and scan for the device. However, i got stuck when it come to setting up the GATT profile(services and characteristics) in order to do the image transferring from the device to my Android app. Anybody has any idea on how can i go about this? any link or guidance will be much appreciated.

Zxing using external camera

I want to integrate my external camera that I connect to tablet with my application using zxing. I know it is possible to use front camera but i would like to connect it via external. Is it possible? if yes how can i do it. I tested my external camera on my Nexus 7 and it does work but i had to use special app and set chmod for device. If exists faster way to set it up without using terminal all the time but only using library in my application i will be glad.
Another iteresting thing is that if I will be able to use my front camera in Nexus 7 to scan any bar codes because it has bad quality.
I also would like to know if exists some other worth testing library for android to use external or front camera.

Android Emulator - /dev/video missing

I am creating an application that connects to the phone camera from native code.
This works great on my phone.
The problem is that when i try to do the same thing with android emulator, there is
no "/dev/video" to connect to (i know the camera is connected because i am able to open it
using the camera app).
Does anyone know if there is another way i can connect to the camera from native code?

/dev/video0 is, in terms of Android, an implementation detail, and not guaranteed to be present on any device or emulator.
Emulator support for camera is very limited, see for example Android webcam enable in emulator

There is no official native camera API on Android, so there's no guaranteed to work way of doing this.
For maximum compatibility, use the Java API and send the image data to native code for processing, if necessary.