code.rb

class MainActivity < Android::App::Activity
  def onCreate(savedInstanceState)
    super
    
    seekBar = Android::Widget::SeekBar.new(self)
    seekBar.setMax(200)
    seekBar.setProgress(100)
      
    textView = Android::Widget::TextView.new(self)

    textView.setText("Initial text")
    
    
    listener =  Android::Widget::SeekBar::OnSeekBarChangeListener.new do 
        def onProgressChanged(seekBar, progress, fromUser)
           super
           textView.Text = progress;
        end
    
    end
    
    
    seekBar.setOnSeekBarChangeListener(listener)
    
    linearLayout = Android::Widget::LinearLayout.new(self)
    
    linearLayout.addView(textView)
    linearLayout.addView(dropDownSpinner)
    
    linearLayout.setPadding(40,40,0,40)
    self.contentView = linearLayout
  end
end