title: Android heart rate monitor code explanation
body: <p>I found this code online for a heart rate monitor and I'm planning to use it as part of my project. I'm, however, having trouble understanding most part of the code as I'm new to Android. I am currently attending a course on Android but it's still in the basics and I have a deadline for the project. I would, hence, appreciate a proper explanation regarding the working of this code (explanation for the java files in the src folder would suffice). Thanks.</p>
  
  <p>Link for code - 
  <a href="https://github.com/phishman3579/android-heart-rate-monitor" rel="nofollow">https://github.com/phishman3579/android-heart-rate-monitor</a></p>