Display Target Data From Firebase
I display a list of my targets in fragmentA, when I click on one of them, I pass the guid of this target to the fragmentB After that, I try in the fragmentB display the data of thi
Solution 1:
To display the data that belongs to a single guid
, you should use a query and then iterate through the DataSnapshot
object like in the following lines of code:
val uid = FirebaseAuth.getInstance().currentUser!!.uid
val rootRef = FirebaseDatabase.getInstance().reference
val targetsRef = rootRef!!.child("targets").child("users").child(uid).child("targets")
val query = targetsRef.orderByChild("guid").equalTo("-LmfEVnwgqCUqt7beHDg")
val valueEventListener = object : ValueEventListener {
overridefunonDataChange(dataSnapshot: DataSnapshot) {
for (ds in dataSnapshot.children) {
val target = ds.getValue(Target::class.java)
Log.d(TAG, target.name)
}
}
overridefunonCancelled(databaseError: DatabaseError) {
Log.d(TAG, databaseError.getMessage()) //Don't ignore errors!
}
}
query.addListenerForSingleValueEvent(valueEventListener)
The result in the logcat will be:
fgg
Solution 2:
You are not getting any data because to get above data your guid value in query should be "-LmfEVnx-y7c3oh8_U9F" but you are passing "-LmfEVnwgqCUqt7beHDg".
You can try below query to get above data:
val uid = firebaseUser!!.uid
// Attach a listener to read the data at the target id
databaseReference?.child("targets")?.child("users")?.child(uid)?.child("targets")?.orderByChild("guid").equalTo(guid)?.addValueEventListener(object : ValueEventListener {
overridefunonDataChange(dataSnapshot: DataSnapshot) {
valdata = dataSnapshot.value as? HashMap<String, String>?
val name = data?.get("name") ?: ""val description = data?.get("description") ?: ""if (name.isEmpty()) Log.d("some", "nameIsEmpty")
else updateViewsContent(name = name, description = description)
}
overridefunonCancelled(databaseError: DatabaseError) {
Log.d("some", databaseError.message)
}
})
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