title: Start Android App on same activity every time
body: <p>I'm working on an Android app that will show college fitness professors how their students are doing in their classes.  Since this data is fairly sensitive (biometrics are shown, including weight, something many college students are self-conscious about) I don't want the data to be available to anyone who picks up the tablet.  While I have a proper login screen created, complete with authentication for the database, etc. I have an issue when the home button is pressed.  Since Android doesn't close a program immediately on leaving the app, it's possible to reopen it and return to where you were.  I would like to force the app to return to the login screen each time (I've altered onBackPressed so you can't just return to the previous view from the login screen) so that you have to re-enter your credentials to get back into the app.  However, I can't seem to do this.  An answer I found on here said to use the following line:</p>
  
  <pre><code>android:clearTaskOnLaunch="true"
  </code></pre>
  
  <p>However, no matter what XML file I put it in, be it the Manifest or the individual Activity XMLs, it appears to do nothing.  So, how do I ensure the login screen comes up each time the app is launched, regardless of whether it is starting from scratch or not?</p>