title: Control App by Keyboard
body: <p>I develope an Android app. <br/>
  I want when user press a key on keyboard (connecting by bluetooth or cable), my app do a specific task.<br/>
  Example: When user press [M] key, the app will show the menu.<br/>
  <br/>
  How can I do it?<br/>
  I means how my app (not a view) listen keyboard?<br/></p>