Bluino Electronics
Arduino Tutorials – Examples is an Arduino tutorial with 64 examples. In this app contains ads and potentially in-app purchases, you can access content online for free at https://www.arduino.cc/en/Tutorial/BuiltInExamples.
You can read description & learn schematic on each example, and also practical directly by uploading code (.hex) to Arduino Uno board over USB/Bluetooth to see what happen. For the example need debugging, you can use Serial Monitor features.
Here tutorials how to make Arduino can uploaded sketch from Android to Arduino Hardware over bluetooth:
https://www.instructables.com/id/Program-Your-Arduino-With-an-Android-Device-Over-B/
Available in Google Play Store for Android
