Mobile Vision API fix for accessing the private Camera instance of the CameraSource object, so that it can be used to set parameters, e.g. focus mode, flash mode, etc.

VisionApiCameraFix.java

/**
 * <p>Returns the supplied {@link com.google.android.gms.vision.CameraSource}'s {@link android.hardware.Camera} instance that is being used.</p>
 * <p>
 * If you want to set any of the camera parameters, here's an example that sets the focus mode to continuous auto focus and enables the flashlight:
 * <blockquote>
 * <code>
 * Camera.Parameters params = camera.getParameters();
 * params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
 * params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
 * camera.setParameters(params);
 * </code>
 * </blockquote>
 * Note that your app might have to hold the permission {@code android.permission.FLASHLIGHT}, so put this in your manifest:
 * <blockquote>
 * <code>
 * &lt;uses-permission android:name="android.permission.FLASHLIGHT" /&gt;
 * </code>
 * </blockquote>
 * </p>
 * <p>
 * Also note that the CameraSource's {@link CameraSource#start()} or
 * {@link CameraSource#start(SurfaceHolder)} has to be called and the camera image has to be
 * showing prior using this method as the CameraSource only creates the camera after calling
 * one of those methods and the camera is not available immediately. You could implement some
 * kind of a callback method for the SurfaceHolder that notifies you when the imaging is ready
 * or use a direct action (e.g. button press) to get the camera and change its parameters.
 * </p>
 * <p>
 * Check out <a href="https://github.com/googlesamples/android-vision/blob/master/face/multi-tracker/app/src/main/java/com/google/android/gms/samples/vision/face/multitracker/ui/camera/CameraSourcePreview.java#L84">CameraSourcePreview.java</a>
 * which contains the method <code>startIfReady()</code> that has the following line:
 * <blockquote><code>mCameraSource.start(mSurfaceView.getHolder());</code></blockquote><br>
 * After this call you can use our <code>cameraFocus(...)</code> method because the camera is ready.
 * </p>
 * <p>
 *     <b>DO NOT</b> set the following parameters using this instance as it might break the detectors:
 *     <ul>
 *         <li>picture size (<code>setPictureSize(...)</code>)</li>
 *         <li>preview size (<code>setPreviewSize(...)</code>)</li>
 *         <li>preview FPS range (<code>setPreviewFpsRange(...)</code>)</li>
 *         <li>preview format (<code>setPreviewFormat(...)</code>)</li>
 *         <li>rotation (<code>setRotation(...)</code>)</li>
 *     </ul>
 * </p>
 *
 * @param cameraSource The CameraSource built with {@link com.google.android.gms.vision.CameraSource.Builder}.
 * @return the actual {@link android.hardware.Camera} instance used by the supplied {@link com.google.android.gms.vision.CameraSource}, or {@code null} on failure.
 * @see android.hardware.Camera
 */
public static Camera getCamera(@NonNull CameraSource cameraSource) {
    Field[] declaredFields = CameraSource.class.getDeclaredFields();

    for (Field field : declaredFields) {
        if (field.getType() == Camera.class) {
            field.setAccessible(true);
            try {
                Camera camera = (Camera) field.get(cameraSource);
                if (camera != null) {
                    return camera;
                }

                return null;
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }

            break;
        }
    }

    return null;
}

Thanks! Works pretty cool

What do you mean? You want to make an IP camera app?