Use OpenCV in Android devices. This project packages the latest version up to this date (9 June 2019 19:35 GMT) which is OpenCV 4.1.0.
Just download and import the project in Android Studio then run it to generate the APK file. You can also download the APK file from here.
After installing the app and run it in your device, the main window appears as below.
Just click the button and the Canny filter will be applied. The result is as shown below.
