title: Firebase connection check online offline status in Android
body: <p>If user turn off both wi-fi, 3g, 4g, and so on and reverse (no internet connection). Firebase database name child connections:(true/false)
  So, when internet connections, wi-fi, 3g, 4g, and so on are off or missing, the user is offline so he can't be found.</p>
  <p>Remember the two scenarios: Before and After. If user is offline before an other user search him, then he will not displayed in the list result, if user is off-line after an other user search him, then it will display NO MORE AVAILABLE icon on the user</p>
  <p>Kindly some one help me for this problem.</p>