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

You're not specifying the task id of the task that you want to update.

String taskId = "-K1NRz9l5PU_0CFDtgXz";

Firebase m_objFireBaseRef = new Firebase(AppConstants.FIREBASE_URL);        
Firebase objRef = m_objFireBaseRef.child("tasks");
Firebase taskRef = objRef.child(taskId);
Map<String,Object> taskMap = new HashMap<String,Object>();
taskMap.put("Status", "COMPLETED");
taskRef.updateChildren(taskMap);

Alternatively, you can just call setValue() on the property you want to update

String taskId = "-K1NRz9l5PU_0CFDtgXz";

Firebase m_objFireBaseRef = new Firebase(AppConstants.FIREBASE_URL);        
Firebase objRef = m_objFireBaseRef.child("tasks");
Firebase taskRef = objRef.child(taskId);
Firebase statusRef = taskRef.child("Status");
statusRef.setValue("COMPLETED");

Or:

Firebase m_objFireBaseRef = new Firebase(AppConstants.FIREBASE_URL);        
Firebase objRef = m_objFireBaseRef.child("tasks");
objRef.child(taskId).child("Status").setValue("COMPLETED");

Update

Not sure what "I need to track the ID based on the status" means. But if you want to synchronize all tasks that are in status Pending, you'd do:

Firebase m_objFireBaseRef = new Firebase(AppConstants.FIREBASE_URL);        
Firebase objRef = m_objFireBaseRef.child("tasks");
Query pendingTasks = objRef.orderByChild("Status").equalTo("PENDING");
pendingTasks.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot tasksSnapshot) {
        for (DataSnapshot snapshot: tasksSnapshot.getChildren()) {
            snapshot.getRef().child("Status").setValue("COMPLETED");
        }
    }
    @Override
    public void onCancelled(FirebaseError firebaseError) {
        System.out.println("The read failed: " + firebaseError.getMessage());
    }
});

Answer 2

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<String, Object> 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);

        }
    });

Answer 3

You guyz are not helping ...we are trying to know what function can help us get the key so that the updates can be automatically without comparing any value . Am on the quest if there is a path i will let u know PERTH

Log.e(TAG, "Key2 is "+getRef(position).getKey());

Please usefirebase Ui Seems the original firebase doesnt have yet.

Answer 4

You can use code below to update

HashMap<String, Object> result = new HashMap<>();
        result.put("Description", "Your Description comes here");

FirebaseDatabase.getInstance().getReference().child("tasks").child("-K1NRz9l5PU_0R8ltgXz").updateChildren(result);

It will update a specific child

Answer 5

You Just need to get the right key Value from the push Method then Update the children when your task is completed by addOnCompleteListener

MyTaskModel myTaskModel = new MyTaskModel();
myTaskModel.Description = "My Text Is Here";
myTaskModel.Status = "PENDING";
        final FirebaseDatabase mFirebaseDatabase = FirebaseDatabase.getInstance();
        final DatabaseReference databaseReference = mFirebaseDatabase.getReference().child("tasks");
        final DatabaseReference dbr= databaseReference.push();
        final String key = dbr.getKey();
        Task task1 = dbr.setValue(myTaskModel);
        task1.addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {

                                     Map<String, Object> taskMap = new HashMap<String, Object>();
                                     taskMap.put("Status", "COMPLETED");                  
                                     FirebaseDatabase.getInstance().getReference().child("tasks").child(key).updateChildren(taskMap);

                                    }
                                }
                            );