Update specific Values using Firebase for Android

Question

I have a Firebase data created as follows

tasks
-K1NRz9l5PU_0R8ltgXz
   Description: \"test1\"
   Status: \"PENDING\"
 -K1NRz9l5PU_0CFDtgXz
   Description: \         


        

Answer 1

This code will find the node content test2, then update the Status. Hope this help. I am using Google Firebase.

FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
    final DatabaseReference reference = firebaseDatabase.getReference();
    Query query = reference.child("tasks").orderByChild("Description").equalTo("test2");
    query.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            DataSnapshot nodeDataSnapshot = dataSnapshot.getChildren().iterator().next();
            String key = nodeDataSnapshot.getKey(); // this key is `K1NRz9l5PU_0CFDtgXz`
            String path = "/" + dataSnapshot.getKey() + "/" + key;
            HashMap result = new HashMap<>();
            result.put("Status", "COMPLETED");
            reference.child(path).updateChildren(result);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Logger.error(TAG, ">>> Error:" + "find onCancelled:" + databaseError);

        }
    });