The app was developed with min sdk: API 18: Android 4.3 (Jelly Bean).
To run the app, just place the apk found in the in CMSC434Doodler onto your android phone.
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Clear doodle
Undo doodle
Change brush size
Change brush opacity
Change color
For the sliding panel I used: https://github.com/umano/AndroidSlidingUpPanel