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Android/Java: detect if device has a BACK Camera

Posted by: admin June 15, 2020 Leave a comment

Questions:

How do I detect if the device has a camera on the BACK?

This is my code to detect if the device has a Flashlight:

if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH) 
    || (_camera.getParameters().getSupportedFlashModes() != null)) hasFlashlight = true;
else hasFlashlight = false;

But it is TRUE even if the device only has a Front Camera without the flashlight.

How to&Answers:

For API >= 9 : you can use Camera.getCameraInfo with something like this :

int backCameraId = -1;
for(int i=0;i<Camera.getNumberOfCameras();i++){
    CameraInfo cameraInfo = new CameraInfo();
    Camera.getCameraInfo(i,cameraInfo);
    if(cameraInfo.facing==CameraInfo.CAMERA_FACING_BACK) {
        backCameraId = i;
        break;
    }
}
Log.d(TAG, "back camera exists ? "+(backCameraId>-1));
Log.d(TAG, "back camera id  :"+backCameraId);

For API >= 21, you are advised to use the Camera2 API :

String backCameraId = null;
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) {
        backCameraId = cameraId;
        break;
    }
}
Log.d(TAG, "back camera exists ? "+(backCameraId!=null));
Log.d(TAG, "back camera id  :"+backCameraId);

Answer:

Try check the number of Cameras:

import android.hardware.Camera;

int numberOfCameras = Camera.getNumberOfCameras();

If it is greater than 1, pretty sure got a rear camera.

Answer:

public boolean isRearCameraAvailable(Context context) {
    return context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA);
}

Checks if the device has a camera facing away from the device user

Answer:

CameraManager mCameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

 /** Which way the camera is facing. */
    public static enum Facing {
        FRONT, BACK;
    }

 /** Returns the ID of the first camera facing the given direction. */
    private String findCameraId(Facing facing) {
        if (facing == Facing.FRONT) {
            return findFirstFrontCameraId();
        } else {
            return findFirstBackCameraId();
        }
    }

    /** Returns the ID of the first back-facing camera. */
    private String findFirstBackCameraId() {
        Log.d(TAG, "Getting First BACK Camera");
        String cameraId = findFirstCameraIdFacing(CameraCharacteristics.LENS_FACING_BACK);
        if (cameraId == null) {
            Log.w(TAG, "No back-facing camera found.");
        }
        return cameraId;
    }

    /** Returns the ID of the first front-facing camera. */
    private String findFirstFrontCameraId() {
        Log.d(TAG, "Getting First FRONT Camera");
        String cameraId = findFirstCameraIdFacing(CameraCharacteristics.LENS_FACING_FRONT);
        if (cameraId == null) {
            Log.w(TAG, "No front-facing camera found.");
        }
        return cameraId;
    }


    /** Returns the ID of the first camera facing the given direction. */
    private String findFirstCameraIdFacing(int facing) {
        try {
            String[] cameraIds = mCameraManager.getCameraIdList();
            for (String cameraId : cameraIds) {
                CameraCharacteristics characteristics = mCameraManager
                      .getCameraCharacteristics(cameraId);
                if (characteristics.get(CameraCharacteristics.LENS_FACING) == facing) {
                    return cameraId;
                }
            }
        } catch (CameraAccessException ex) {
            Log.w(TAG, "Unable to get camera ID", ex);
        }
        return null;
    }