Ruboto horizontal progress bar?

I'm very new to Android development (therefore to Ruboto), I have the following code in an attempt to display a text field, a button, and a progress bar. I would like to turn this progress bar into a horizontal progress bar:

require 'ruboto/widget'
require 'ruboto/util/toast'

ruboto_import_widgets :Button, :LinearLayout, :TextView, :ProgressBar

class SplashActivity
  def onCreate(bundle)
    super
    set_title 'some title here'

    self.content_view =
        linear_layout :orientation => :vertical do
          @text_view = text_view :text => 'sample text.', :id => 42, 
                                 :layout => {:width => :match_parent},
                                 :gravity => :center, :text_size => 18.0
          button :text => 'foo', 
                 :layout => {:width => :match_parent},
                 :id => 43, :on_click_listener => proc { bar }
          progress_bar
        end
  rescue Exception
    puts "Exception creating activity: #{$!}"
    puts $!.backtrace.join("\n")
  end

  private

  def bar
    @text_view.text = 'things change.'
    toast 'cha-ching!'
  end

end

All elements display as expected. The progress_bar is the indeterminate mode by default, what attributes are needed to convert the progress_bar into horizontal?

I have found Ruboto has been super easy to pick up, I just cannot find enough API documentation for customized controls. A lot of the functionality I'm looking for in the application I'm developing could be found in the GitHub source, but a lot is commented out. Is there something I am overlooking for detailed API documentation?

Solution

There is no setter for style on ProgressBar, so you have to set it at creation time in the constructor. Note that SplashActivity can conflict with the Ruboto SplashActivity.java, so I use another name (ProgressBarActivity)

require 'ruboto/widget'
require 'ruboto/util/toast'

ruboto_import_widgets :Button, :LinearLayout, :TextView, :ProgressBar

class ProgressBarActivity
  AndroidAttr = JavaUtilities.get_proxy_class('android.R$attr')

  def onCreate(bundle)
    super
    set_title 'some title here'

    self.content_view =
        linear_layout :orientation => :vertical do
          @text_view = text_view :text => 'sample text.', :id => 42,
              :layout => {:width => :match_parent},
              :gravity => :center, :text_size => 18.0
          button :text => 'foo',
              :layout => {:width => :match_parent},
              :id => 43, :on_click_listener => proc { bar }
          @pb = ProgressBar.new(self, nil, AndroidAttr::progressBarStyleHorizontal)
          @view_parent.add_view @pb
        end
  rescue Exception
    puts "Exception creating activity: #{$!}"
    puts $!.backtrace.join("\n")
  end

  def onResume
    super
    @pb.progress = @pb.max / 2
  end

  private

  def bar
    @text_view.text = 'things change.'
    @pb.progress = 2 * @pb.max / 3
    toast 'cha-ching!'
  end

end