Extracting data from Firebase data snapshot-CodePudding

I am trying to get data from a DataSnapshot from firebase. I can see the DataSnapShot in logs but I am getting an error when assigning it to a variable. See below for more details

In logcat:

D/loggxxxxxxxxxxxxxxxxx: DataSnapshot { key = latitude, value = -20.0688881 }
D/loggxxxxxxxxxxxxxxxxx: DataSnapshot { key = longitude, value = 57.5226424 }

public void onChildAdded(DataSnapshot dataSnapshot, String s) {
    if (dataSnapshot.exists()){
        Log.d("loggxxxxxxxxxxxxxxxxx",dataSnapshot.toString());
        Toast.makeText(MapsActivity.this, dataSnapshot.toString(), Toast.LENGTH_SHORT).show();             
    }
    else{
        Toast.makeText(MapsActivity.this, "Nodata", Toast.LENGTH_SHORT).show();
    }

My Firebase Realtime database looks like this:

"location": {
  "HarryMaguire": {
    "latitude": "-20.0688881",
    "longitude": "57.5226424"
  },
  "RoseGilbert": {
    "latitude": "20.3484",
    "longitude": "57.5522"
  },

CodePudding user response：

This is my approach to pull data from firebase database. I think you are having a problem with data extraction. And this kotlin

 fun getDataFromFirestore() {
    val userID = sharedPreferences.getString("Firma_Firebase_ID", "")
    if (userID != "") {
        val DB = Firebase.firestore
        DB.collection("Database").document(userID.toString()).addSnapshotListener{ snapshot, error ->
        val document = snapshot?.data
        runBlocking {
            launch {
                if (snapshot != null && document != null) {
                    val name = document.get("name") as? String
                    if (name != null) {
                        Name = name
                    }
                }
            }
        }
        //Notify
        }
    }
}

CodePudding user response：

It looks like you're attaching a ChildEventListener to the location/HarryMaguire path in your database. When you do that, onChildAdded gets trigger with each child property of location/HarryMaguire, which is why you see logs for latitude and longitude.

Will update more, once the question provides the necessary information.