Comment by FLY for The Android Manager was introduced to avoid the need to keep OpenCV libs copy inside each app package. Instead it is installed as a separate app and share a single OpenCV instance across all the app-s in the system. See the slides for details.If you prefer not to use OpenCV Manager advantages and keep own OpenCV copy in your app APK, follow the static initialization option.

Well slides are good to give better understanding for why we need to use `Android Manager` but it look awkward that the user have to download something extra with the app , but do you think that mostly photo editing app's use opencv ? can we use OpenCV with android 2.2 and for all above