CODEWITHSUNDEEP
androidfirebase-realtime-databaseandroid-recyclerview
Deepak Rakh
Deepak Rakh

Reputation: 37

How to retrieve child value from firebase?

Here is my problem, I want to show all phone numbers in RecyclerView, how?

databaseReference = firebaseDatabase.getReference("CallLog");
//in on data change method using for
CallLogList logList = snapshot.getValue(CallLogList.class);
                list.add(logList);

firebase strucure

ArrayList<HashMap<String, String>> arrayList = new ArrayList<HashMap<String,String>>(); 
HashMap<String, String> map = new HashMap<String, String>(); map.put("phone",phoneNumber); 
map.put("name",callName);
map.put("callType",dir);
map.put("date",dateString);
map.put("duration",callDuration+" seconds"); 
arrayList.add(map);
myRef.push().setValue(arrayList);

Upvotes: 0

Views: 833

Answers (2)

Jasurbek
Jasurbek

Reputation: 2966

After getting the whole list from Firebase iterate them one by one to add them in the list, after the loop set them in the adapter of RecyclerView, and set the adapter to your desired RecyclerView

 @Override
 public void onDataChange(DataSnapshot dataSnapshot) {
                // This method is called once with the initial value and again
                // whenever data at this location is updated.
                list = new ArrayList<CallLogList>();
                for(DataSnapshot dataSnapshot1 :dataSnapshot.getChildren()){

                   CallLogList logList = snapshot.getValue(CallLogList.class);
                   list.add(logList);

                }


                yourAdapter = YourAdapter(list);
                yourRecyclerView.setAdapter(yourAdapter);


            }

For more info, here is a full example

Note: If you are using LiveData or Paging then setting adapters is different, Let me know if you need more example

Upvotes: 1

TK-421
TK-421

Reputation: 349

First you should change the tree to be like this:

Call Log
-Calls
--Lhe...
---CallType OUTGOING
--Lhe...
---CallType INCOMING

Next, create "Calls" class in your project with the same fields as in the firebase, so callType, date, duration and phone. After that, with this code, you can get all instances from the database into a list:

    public void refreshList(DataSnapshot dataSnapshot) {
        List<Class> list = new ArrayList<>();
        for (DataSnapshot dataSnapshot1 : dataSnapshot.child("Calls").getChildren()) 
        {
            Item value = dataSnapshot1.getValue(Calls.class);
            list.add(value);
        }
    }

Now you have a list of objects of class Calls, from which you can easily access the phone numbers.

Upvotes: 1

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