title: Check GPS signal
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/2131638/how-to-detect-whether-gps-signal-is-weak-or-high">How to detect whether GPS signal is weak or high?</a>  </p>
  </blockquote>
  
  
  
  <p>Is there any possible way to know that the GPS signal is week ?
  Such as the user in the building then the GPS may not send data. This is the reason why I want to check the GPS signal.</p>