FirebaseDatabase.getInstance（）。getReference（）到子节点并列出该子节点下的键值对

Question

I am trying to access the shrubs child and under each unique key under shrubs, access the key value pairs eg key : ShrubbedWord value : yfyj

I've tried this but I get nothing:-

postsData = FirebaseDatabase.getInstance().getReference().child("Shrubs");

        ChildEventListener childEventListener = new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {

                    for (DataSnapshot dttSnapshot2 : dataSnapshot.getChildren()) {
                            Log.d("mylog", "" + dttSnapshot2.getKey().toString() + ":" + dttSnapshot2.getValue().toString());
                    }
            }

Now when I try this:

postsData = FirebaseDatabase.getInstance().getReference();

        ChildEventListener childEventListener = new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {

                    for (DataSnapshot dttSnapshot2 : dataSnapshot.getChildren()) {
                            Log.d("mylog", "" + dttSnapshot2.getKey().toString() + ":" + dttSnapshot2.getValue().toString());
                    }
            }

My log returns a whole bunch of data from birthday all the way to Shrubs which I don't need. Just want the data in the Shrubs child in key value pairs.

Anyone know how I can achieve this?

Answer 1

Try this:

 DatabaseReference ref=FirebaseDatabase.getInstance().getReference().child("unknown").child("Shrubs");
ref.addValueEventListener(new ValueEventListener(){
 @Override
 public void onDataChange(DataSnapshot dataSnapshot) {
  for(DataSnasphot datas: dataSnapshot.getChildren()){
     String name=datas.child("ShrubbedWord").getValue().toString();
    } 
 }

@Override
public void onCancelled(FirebaseError firebaseError) {


    }
   });

You need to go from top to bottom, in the image that you provided there is a child node that you added red lines on it so we do not see it.

I have named it in the code as child("unknown") , but in your code name it as the name that it is written in the database.

After that you write child("Shrubs") , then your dataSnapshot will be at the location of the Shrubs child node. Then you can iterate inside the push id to be able to retrieve the attributes and the values inside of it.