Get children using orderByChild-equalsTo in Firebase-Android

Question

This is my data on Firebase-

app-<br />
-Users<br />
 +366MWex62IhUaOwbkjjGedIgLQJ3<br />
 -sfsfaegaergg<br />
     firstname: "John"<br />
     lastname: "Doe"<br />
     phone: "[phone]"<br />

There are two users in my db for now. My input is phone = "[phone]" (2nd user)<br />

This is my code-

    DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
        DatabaseReference rf = rootRef.child("Users");
        com.google.firebase.database.Query query = rf.orderByChild("phone").equalTo("[phone]");
        query.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for(DataSnapshot snap: dataSnapshot.getChildren()) {
                    Log.v("children", snap.getChildren().toString());
                }
            }
            @Override
            public void onCancelled(DatabaseError databaseError) {
            }
    });

I am not getting the details of the second user. The debugger goes till addValueListener and then directly exits. Where do I need to make corrections? Thank you.

Answer 1

"The debugger goes till addValueListener and then directly exits" - the result will come back asynchronously. Have you set breakpoint in onDataChange? – John O'Reilly

Thank you.

Answer 2

 mFirebaseRef = mFirebaseInstance.getReference();
    DatabaseReference queryLocation = 
 mFirebaseRef.child("BloodGroupDetail");
    Query query = queryLocation.orderByChild("bloodgroup").equalTo("B+");
    query.addValueEventListener(new ValueEventListener() {

        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            getUpdate(dataSnapshot);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }


    });

Answer 3

Try this :

 DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference().child("Users");    
rootRef.orderByChild("phone").equalTo("[phone]").addListenerForSingleValueEvent(
    new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            //data will be available on dataSnapshot.getValue();
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.w(TAG, "getUser:onCancelled", databaseError.toException());
        }
});