JarCastingArduino 
A lightweight Android library to communicate with Arduino through USB.
Gradle
build.gradle Project
allprojects {
repositories {
jcenter()
maven { url "https://jitpack.io" }
}
}
build.gradle Module
implementation 'me.aflak.libraries:arduino:1.4.5'
Usage
Arduino arduino = new Arduino(Context);
@Override
protected void onStart() {
super.onStart();
arduino.setArduinoListener(new ArduinoListener() {
@Override
public void onArduinoAttached(UsbDevice device) {
arduino.open(device);
}
@Override
public void onArduinoDetached() {
// arduino detached from phone
}
@Override
public void onArduinoMessage(byte[] bytes) {
String message = new String(bytes);
// new message received from arduino
}
@Override
public void onArduinoOpened() {
// you can start the communication
String str = "Hello Arduino !";
arduino.send(str.getBytes());
}
@Override
public void onUsbPermissionDenied() {
// Permission denied, display popup then
arduino.reopen();
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
arduino.unsetArduinoListener();
arduino.close();
}
Custom vendor id
The library currently filters the vendor id 9025, but you can add your own filter by calling :
Arduino arduino = new Arduino(Context);
arduino.addVendorId(1234);
Custom delimiter while reading
You can set a custom delimiter byte (default is \n) :
Arduino arduino = new Arduino(Context);
arduino.setDelimiter(';');
Arduino Side
Example code which sends back every character received
void setup() {
Serial.begin(9600);
}
void loop() {
if(Serial.available()){
char c = Serial.read();
Serial.print(c);
}
}
Sample Code
Special thanks
This code is using UsbSerial library : https://github.com/felHR85/UsbSerial
License
MIT License
Copyright (c) 2017 Michel Omar Aflak
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.