I want to remove addValueEventListener listener from a firebase ref when value of particular field is true.
ValueEventListener valueListener=null;
private void
I hope this will help you... just yo can use this method, it's work for me...
private DatabaseReference dbRef;
Write from onCreate()
FirebaseDatabase database = FirebaseDatabase.getInstance();
dbRef= database.getReference("YOUR_PATH").child("KEY_NAME");
InitListener();
dbRef.addValueEventListener(valueEventListener); // ADDIND_LISTENER
Write from onDestroy()
if (dbRef!=null){
dbRef.removeEventListener(valueEventListener);
valueEventListener=null;
dbRef=null;
}
Listener
private void InitListener(String templeId) {
valueEventListener=new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
};
}
Make sure you add and remove the listener to the same node on your DatabaseReference. For example:
//when declared like this, mDatabaseReference will point to the parent node by default
private DatabaseReference mDatabaseReference = FirebaseDatabase.getInstance().getReference();;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//listener added to child node "path_2"
mDatabaseReference.child(path_1).child(path_2).addChildEventListener(myListener);
}
Your listener is this case is pointing to path_2. If you try to remove your listener using this code
//mDatabaseReference pointing to parent node (default behaviour)
mDatabaseReference.removeEventListener(myListener);
it won't work because you are trying to remove the listener from the wrong node. The correct way would be
mDatabaseReference.child(path_1).child(path_2).removeEventListener(myListener);
You can remove the listener from within the callback with:
ref.removeEventListener(this);
So a complete fragment:
String key="https://boiling-heat-3083.firebaseio.com/baseNodeAttempt/" + userId+"/"+nodeType+"/"+nodeId+"/data";
final Firebase ref = new Firebase(key);
ref.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snap) {
if (snap.hasChild("attemptFinish_"+nodeId) {
boolean isFinished = (boolean) snap.child("attemptFinish_"+nodeId).getValue();
if(isFinished){
ref.removeEventListener(this);
}
}
}
@Override
public void onCancelled() {
// TODO Auto-generated method stub
}
});
I removed the HashMap
, instead using the methods of the DataSnapshot
to accomplish the same. I also renamed a few variables to be clearer/more idiomatic.
private DatabaseReference dbRef;
ValueEventListener mSendEventListner;
dbRef = FirebaseDatabase.getInstance().getReference().child("users").child(phone);
ValueEventListener valueEventListener = new ValueEventListener()
{
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists())
{
//
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
//
}
};
dbRef.addValueEventListener(valueEventListener);
mSendEventListner = valueEventListener;
//REMOVE VALUE EVENTLISTNER...
@Override
protected void onDestroy()
{
super.onDestroy();
if (mSendEventListner != null) {
dbRef.removeEventListener(mSendEventListner);
}
}