Validate if keyboard is visible in calabash android

gistfile1.rb

Then(/^i should see the keyboard on the screen$/) do
    assert_true(keyboard_visible?, 'Keyboard was not displayed')
end

def keyboard_visible?
		system('adb shell dumpsys input_method > system_prop.txt')
		if File.open('system_prop.txt').lines.any? { |line| line.include?('mInputShown=true') }
			return true
		else
			return false
		end
end