is_focused_app.rb

# Implement is focused app using dumpsys window windows
def is_focused_app app
  output = `#{adb_command} shell dumpsys window windows`
  return false if output.nil?

  target = nil

  output.each_line do |line|
    if line.include? 'mFocusedApp'
      target = line
      break
    end
  end

  return false if target.nil?
  focused = target.match(/\/\.([^}]+)}/)

  return false if focused.nil?
  focused[1] == app
end

puts is_focused_app 'MyActivity'

Cool! The regex has to be changed a bit though since the activity can be shown in one of these three ways:

mFocusedApp=... u0 x.y.z/MyActivity}}}
mFocusedApp=... u0 x.y.z/.MyActivity}}}
mFocusedApp=... u0 x.y.z/.foo.bar.MyActivity}}}

I think this would work [\.\/]([^.\/\}]+).

By using Enumerable.grep and including mFocusedApp we can do all the grepping in one line:

def focused_activity
  `#{adb_command} shell dumpsys window windows`.each_line.grep(/mFocusedApp.+[\.\/]([^.\/\}]+)}/){$1}.first
end

I think it more general focused_activty would be useful but a helper method like your is_focused_activity? is a good helper

@jonasmaturana I think your focused_activity is better. Then something like this can be written:

def wait_for_activity activity
  retriable :tries => 5, :interval => 2 do
    focused = focused_activity
    raise "Activity #{activity} not found. Current activity is #{focused}" if focused != activity
  end
end