Android - Turn flashlight on and off

private boolean isFlashSupported(PackageManager packageManager) {
    return packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
}

private boolean isCameraSupported(PackageManager packageManager) {
    return packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA);
}

public void setTorchState(boolean torchState) {

        Log.v(LOG_TAG, "setTorchState - " + torchState);

        PackageManager packageManager = getPackageManager();

        if (isCameraSupported(packageManager) && isFlashSupported(packageManager)) {

            if (camera == null)
                try {
                    camera = Camera.open();
                } catch (Exception e) {
                    e.printStackTrace();
                    flashOn = false;
                }

            if (torchState) {
                if (camera != null) {
                    try {
                        Parameters param = camera.getParameters();
                        param.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
                        camera.setParameters(param);
                        sleep(300);
                        camera.startPreview();
                        flashOn = true;
                    } catch (Exception e) {
                        e.printStackTrace();
                        flashOn = false;
                    }
                }
            } else {
                if (camera != null) {
                    try {
                        Parameters param = camera.getParameters();
                        param.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
                        camera.setParameters(param);
                        camera.stopPreview();
                        camera.release();
                        camera = null;
                        flashOn = false;
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }

            sendBroadcast(new Intent(FLASHLIGHT_CHANGED)); // receive in custom receiver
        }
    }