How to detect if android phone has dual back camera

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How do I detect if android phone has dual back camera

I tried

CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
    try {
        for(String id: manager.getCameraIdList())
            Log.e("dualtest", id);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    }

but it gives me only 2 ids 0 and 1.

camera android java
3 Answers

You can use Camera.getCameraInfo Like follows. If you use api lvl 9

List<Integer> camID = new ArrayList<Integer>();    
        for(int i=0;i<Camera.getNumberOfCameras();i++){
            CameraInfo cameraInfo = new CameraInfo();
            Camera.getCameraInfo(i,cameraInfo);
            if(cameraInfo.facing==CameraInfo.CAMERA_FACING_BACK) {
                camID.add(i);
                break;
            }
        }

If you are using api lvl 21 you can use Camera2 api

List<String> camID = new ArrayList<String>(); 

    CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
    for(String cameraId:manager.getCameraIdList()){
        CameraCharacteristics cameraCharacteristics = manager.getCameraCharacteristics(cameraId);
        Integer facing = cameraCharacteristics.get(CameraCharacteristics.LENS_FACING);
        if(facing==CameraMetadata.LENS_FACING_BACK) {
            camID.add(cameraId);
            break;
        }
    }

Reference

https://developer.android.com/reference/android/hardware/camera2/CameraManager.html

https://developer.android.com/reference/android/hardware/Camera.html#getCameraInfo(int,%20android.hardware.Camera.CameraInfo)

user_63362210

Just a personal opinion here, but I don't think that this is possible (although I don't have any proof for this). Usually, the 2 dual cameras are very different on their own: aperture, zoom, colours and so on. They may not work so well on their own, but do a great job when the software combines the input from both. But if the processing software is very good, you don't even need the dual camera setup (take Google's camera app which does an excellent job at this). In conclusion, there is a big variety of how this dual cameras are made, and if a single camera work on some setups, on others it may be totally useless. This is why I believe that even though you have 2 cameras on the back, they are treated as a single camera by the system. Also, given the amount of Android phones manufacturers, there would be hard to align all of them in order to develop an unified API. Depending on the manufacturer, they may give you some APIs to access only one camera, but that will work only on their phones, and until Google doesn't switch to the dual camera setup, I don't believe that there will be an API that provides this feature.

user_37341720
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