add Timer sample app for android

android-samples/Timer/.gitignore

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+.repl_history
+build
+tags
+.DS_Store
+nbproject
+.redcar
+#*#
+*~
+*.sw[po]
+.eprj
+.sass-cache
+.idea
+.dat*.*

android-samples/Timer/Rakefile

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+# -*- coding: utf-8 -*-
+$:.unshift("../..//lib")
+require 'motion/project/template/android'
+
+Motion::Project::App.setup do |app|
+  # Use `rake config' to see complete project settings.
+  app.name = 'Timer'
+  app.api_version = '18' 
+  app.sdk_path = File.expand_path('~/src/android-sdk-macosx')
+  app.ndk_path = File.expand_path('~/src/android-ndk-r9d')
+end

android-samples/Timer/app/main_activity.rb

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+  class TimerButtonListener < Java::Lang::Object
+    def set_activity(activity)
+      @activity = activity
+    end
+
+    def onClick(view)
+      @activity.toggleTimer
+    end
+  end
+
+  class TimerTask < Java::Util::TimerTask
+    def set_activity(activity)
+      @activity = activity
+    end
+
+    def run
+      @activity.handler.post -> { @activity.updateTimer }
+    end
+  end
+
+class MainActivity < Android::App::Activity
+  def onCreate(savedInstanceState)
+    super
+    @handler = Android::Os::Handler.new
+
+    layout = Android::Widget::LinearLayout.new(self)
+    layout.orientation = Android::Widget::LinearLayout::VERTICAL
+
+    @label = Android::Widget::TextView.new(self)
+    @label.text = 'Tap to start'
+    @label.textSize = 40.0
+    @label.gravity = Android::View::Gravity::CENTER_HORIZONTAL
+    layout.addView(@label)
+
+    @button = Android::Widget::Button.new(self)
+    @button.text = 'Start'
+    listener = TimerButtonListener.new
+    listener.set_activity self
+    @button.onClickListener = listener
+    layout.addView(@button)
+
+    self.contentView = layout
+  end
+
+  def handler
+    @handler
+  end
+
+  def toggleTimer
+    if @timer
+      @timer.cancel
+      @timer = nil
+      @button.text = 'Start'
+    else
+      @timer = Java::Util::Timer.new
+      @counter = 0
+      task = TimerTask.new
+      task.set_activity self
+      @timer.schedule task , 0, 100
+      @button.text = 'Stop'
+    end
+  end
+
+  def updateTimer
+    @label.text = "%.1f" % (@counter += 0.1)
+  end
+end
+