title: How to open an activity in each case
body: <p>I have a menu in Action bar so i want in each case to open an activity. I cant figure out how to do it. My first activity is about us (just a textview)</p>
  
  <pre><code>//Override method for main menu
  @Override
  public boolean onOptionsItemSelected(MenuItem item) { switch(item.getItemId()) {
      case R.id.about_us:
          //open AboutUsActivity
  
          return(true);
      case R.id.about_measures:
          //add the function to perform here
          return(true);
      case R.id.feedback:
          //add the function to perform here
          return(true);
      case R.id.rate:
          //add the function to perform here
          return(true);
  }
      return(super.onOptionsItemSelected(item));
  }
  </code></pre>