title: Close an specific activity android
body: <p>Just, How can I close an specific activity of my application?</p>
  
  <p>for example I have the activities: </p>
  
  <p>A1 > B1 > C1  </p>
  
  <p>And in C1 I can go to A activity again with new params so when I will open a new B (B2), I want to close older activities: A1, B1, C1.</p>
  
  <p>Being the new result:</p>
  
  <p>A2 > B2</p>
  
  <p>Where I can go back to A2 after of B2, and finish the app from A2.</p>