hey ive got an error and this is my error :Make sure to call FirebaseApp.initializeApp(Context) first : This is my code 
[enter image description here][1]


and this is my gradle 
[enter image description here][2]


this is my gradle project][3]


  [1]: https://i.stack.imgur.com/TTvXF.png
  [2]: https://i.stack.imgur.com/zBFJD.png
  [3]: https://i.stack.imgur.com/vPyMl.png