title: button on homescreen widget
body: <p>I have an widget with an button (R.id.button) 
  When I click the button, it should open the activity: "openactivity" 
  Do you now I can do this. It's an basic question because I'm new in Android developing.</p>
  
  <p>I hope you understand me, and you could help me.</p>
  
  <p>Gaauwe</p>