Android Firebase onDataChange is not called?

Question

I have more than 40,000 nodes in my Firebase Database. But whenever I am trying to read a key from my Android code, the onDataChange method is not getting calle

Answer 1

Open Firebase link -> Database -> Rules -> Probably values here are false in your case. Make it true as the following.

  {
    "rules": {
      ".read": true,
      ".write": true
    }
  }