How to remove child nodes in firebase android?

Question

I have a number of child nodes in my firebase db and I want to delete only one child node.

Firebase firebase=new Firebase("..address..");

firebase.push().setValue(classObj);

//here classObj is a class object which has a getter and setter for an integer id

Now that I have pushed multiple objects I want to delete only one based on the id in the classObj

score 81 · Accepted Answer · answered Mar 23 '16 at 18:13

81

To remove data:

firebase.child(id).removeValue();

You might do well to have a look at the Firebase documentation for Android btw, which covers this and many more topics.

answered Mar 23 '16 at 18:13

Frank van Puffelen

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By using push, a random id is generated. So how did you get the id in firebase.child(id).removeValue()? – Amit Jayant May 23 '16 at 11:46
This worked for me, but I had to first remove .push() from the DatabaseReference. – Bob McNees Jul 04 '16 at 14:24
Push returns a databasereference and you can getkey from it to know the id – Kushan Nov 25 '16 at 10:58
you can get the push key's value following this answer: https://stackoverflow.com/a/38232280/5572246. And then after that its simply: firebase.child(pushKeyValue).removeValue() – Pamela Sillah Sep 10 '17 at 21:48
@Akhil How does removeValue remove the key as well? – Sreekanth Karumanaghat Sep 27 '17 at 12:47
1

Firebase only stores a path when there is a value at that path. So removing a value, will remove the key for that value too. In fact, if removing a value makes en entire branch of your JSON empty, it will remove that entire branch. – Frank van Puffelen Sep 27 '17 at 13:54

score 15 · Answer 2 · edited Apr 06 '18 at 11:14

15

If you are using DatabaseReference for firebase

DatabaseReference dbNode = FirebaseDatabase.getInstance().getReference().getRoot().child("Node");

Here Node represents the child which you wish to delete

dbNode.setValue(null);

If you are using a dataSnapshot

i.e., while you are working on some data change events

dataSnapshot.getRef().setValue(null);

edited Apr 06 '18 at 11:14

Rhox

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answered Oct 16 '16 at 13:25

Purushothama Raju Prathigudupu

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score 1 · Answer 3 · answered Apr 02 '20 at 07:47

1

To remove a Node or child node

private FirebaseDatabase database = FirebaseDatabase.getInstance();

database.getReference("root_node_name")
   .child("child_node_name")
   .removeValue();

To remove Sub-child node

database.getReference("root_node_name")
   .child("child_node_name")
   .child("sub_child_node_name")
   .removeValue();

answered Apr 02 '20 at 07:47

Akash Starvin Dsouza

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how to remove the "sub_child_node_name" if "child_node_name" is not known – Amit Ghosh Jan 14 '21 at 23:37

score 0 · Answer 4 · answered Apr 10 '18 at 14:40

0

You need to run this code:

 Firebase firebase=new Firebase(URL);
    firebase.child(id).removeValue();

answered Apr 10 '18 at 14:40

Sunny Sultan

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20

How to remove child nodes in firebase android?

4 Answers4

If you are using DatabaseReference for firebase

If you are using a dataSnapshot

Linked

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