example on how to expose an http interface to execute command on an android phone using adb

example.rb

require 'sinatra/base'

# wrapper to easily translate tap coordinates to readable methods
class Calculate
  PAD = {
        '1' => [100, 1200],
        '2' => [400, 1200],
        '3' => [700, 1200],
        '4' => [100, 1350],
        '5' => [400, 1350],
        '6' => [700, 1350],
        '7' => [100, 1500],
        '8' => [400, 1500],
        '9' => [700, 1500],
        '0' => [400, 1650]
      }
  def sum(a, b)
    a.to_s.split('').each do |num|
      tap(PAD[num], 0)
    end
    tap([900, 1650])
    b.to_s.split('').each do |num|
      tap(PAD[num], 0)
    end
    tap([700, 1650])
  end
  
  # you use X and Y screen coordindates for the tap
  def tap(x_y, delay = 1.0)
    puts "tapping #{x_y.join(' ')}"
    
    # TODO: use open3
    `adb shell input tap #{x_y.join(' ')}`
    sleep(delay) if delay.to_f > 0.0
  end
  
end

# accepts post requests to /sum and calls the Calculator#sum method
post '/sum' do
  Calculator.new.sum(params[:a], params[:b])
end