Bluino Loader Pro is an Arduino programmer software (Arduino IDE) runs on android, makes it easy to write sketch code, compile sketch to generate hex file and upload it to Bluino or various Arduino board via USB OTG or wireless bluetooth.
The environment is written in android based on open source Turbo Editor by Vlad Mihalachi https://github.com/vmihalachi/turbo-editor.

Here how to upload sketch from Android to Arduino Hardware
https://www.instructables.com/id/Program-Your-Arduino-With-an-Android-Device-Over-B/
or
http://www.instructables.com/id/How-to-Make-Bluetooth-Shields-for-Upload-Sketch-to/

Here Schematic and PCB eagle Bluino One open source
https://github.com/mansurkamsur/Bluino-ONE

Features:
★ Upload sketch via USB OTG or Bluetooth
★ Support any USB driver: CDC/ACM, FTDI, PL2303, CH34X and CP210X
★ Upload sketch to Bluino/Arduino: Uno, Nano, Mega2560, Pro Mini and Duemilanove
★ Upload directly HEX file to Arduino board
★ Open/edit arduino sketches
★ Serial monitor included
★ Example sketches and libraries included
★ Compile sketches/generate hex file (no root required)
★ Upload sketches to Bluino board over bluetooth
★ Super cool theme with Material Icons
★ Support for reads every type of text files
★ Syntax Highlight
★ Line Numbers
★ Go To Line
★ Option to wrap the content if text is too large
★ Auto save mode to save files as you leave the application
★ Read only mode
★ Create files and folders a inside the app
★ Search files and folders
★ Support for Undo & Redo
★ Translated in many languages
★ Movable on the SD card