检测是否存在相机硬件代码

/**
     * 检测是否存在相机硬件
     * @param context
     * @return
     */
    public boolean checkCameraHardware(Context context) {
        if (context.getPackageManager().hasSystemFeature(
                PackageManager.FEATURE_CAMERA)) {
            // this device has a camera
            return true;
        } else {
            // no camera on this device
            return false;
        }
    }