title: Start an Activity with a parameter
body: <p>I'm very new on Android development.</p>
  
  <p>I want to create and start an activity to show information about a game. I show that information I need a gameId.</p>
  
  <p>How can I pass this game ID to the activity? The game ID is absolutely necessary so I don't want to create or start the activity if it doesn't have the ID.</p>
  
  <p>It's like the activity has got only <strong>one</strong> constructor with one parameter.</p>
  
  <p>How can I do that?</p>
  
  <p>Thanks.</p>