I am trying to listen to my database child changes, in my case it is orders.
Below is a picture of my database, where
ODdPag... Is the uid of my customer
Lu-_1A is just .push
random order naming
I can provide my code but it is confusing and not working, because i can only access Orders and not its next child.
Now I want to list all my orders and lister for changes in sub children (in order names) not uid.
I am using:
val db = FirebaseDatabase.getInstance.reference
val ref = db.child("/Orders/")
ref.addChildEventListener(object: ChildEventListener {
override fun onChildAdded(p0: DataSnapshot, p1: String?) {
ringtone.play()
itemListTable.clear()
p0.children.forEach {
it.child("order").children.forEach{ item ->
val newData = item.getValue(itemListData::class.java) ?: return
newData.itemName = item.key!!
newData.orderKey = it.key!!
itemListTable.add(newData)
}
val data = it.getValue(itemRowData::class.java) ?: return
adapter.add(itemRow(data.phoneNumber,data.time,data.locationLat,data.locationLong,data.optionalAddress,data.optionalNote,data.totalPrice,itemListTable,it.key))
}
}
override fun onChildChanged(p0: DataSnapshot, p1: String?) {
Log.d("ac1234","$p0")
p0.child("order").children.forEach{ item ->
Log.d("ac1234","1")
val newData = item.getValue(itemListData::class.java) ?: return
Log.d("ac1234","2")
newData.itemName = item.key!!
newData.orderKey = p0.key!!
itemListTable.add(newData)}
val data = p0.getValue(itemRowData::class.java) ?: return
adapter.add(itemRow(data.phoneNumber,data.time,data.locationLat,data.locationLong,data.optionalAddress,data.optionalNote,data.totalPrice,itemListTable,p0.key))
}
class itemRowData(val phoneNumber :String = "",val time :String = "",val locationLat :Double = 0.0,val locationLong :Double = 0.0,val optionalAddress :String = "",val optionalNote :String = "",val totalPrice :String = "")
class itemListData(var itemName: String = "" ,val totalQuantity: String = "",val totalPrice :Long = 0,var orderKey :String = "")
Logcat: 1 and 2 are not called
P0 shows 4 rows full of all data every time I send an order
I want all orders from all users, that is my problem. I cant reference to every ("/Orders/uid") to listen to child changes
To get all orders of all users, you should use a ValueEventListener
, like in the following lines of code:
val rootRef = FirebaseDatabase.getInstance().reference
val ordersRef = rootRef.child("Orders")
val valueEventListener = object : ValueEventListener {
override fun onDataChange(dataSnapshot: DataSnapshot) {
for (uidDataSnapshot in dataSnapshot.children) {
for (orderDataSnapshot in uidDataSnapshot.children) {
val newData = orderDataSnapshot.getValue(itemListData::class.java)
itemListTable.add(newData)
}
}
}
override fun onCancelled(databaseError: DatabaseError) {
Log.d(TAG, databaseError.getMessage()) //Don't ignore errors!
}
}
ordersRef.addValueEventListener(valueEventListener)
See, in order to get each order of each user, you should iterate twice, once to get the uidDataSnapshot
and then to get the orderDataSnapshot
object.