How to access a child inside real time database array child?

String count = item_count.getText().toString();

firebaseDatabase = FirebaseDatabase.getInstance();
reference = firebaseDatabase.getReference();

reference.child("beverages").child(????).child("item_count").setValue(count);

this is my code but i don't know what should i put in the question marks.

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CodePudding user response：

You can get the item_count by using foreach loop inside the onDataChange method.

1. Lets say this is your model class for your Beverage.

public class Beverage {
    private long item_count;
    private String item_img;
    private String item_name;

    public Beverage beverage(long itemCount){
       this.item_count = itemCount;
       //and do others also...
    }

    //Here your get set...
}

2. Here you get the data as arrayList

reference.child("beverages").addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
        if (dataSnapshot.exists()) {
            ArrayList<Beverage> beveragesList = new ArrayList<Beverage>();
            //Get children
            for (DataSnapshot snapShot : dataSnapshot.getChildren()) {
                if (snapShot.exists()) {
                    final Beverage beverage = snapShot.getValue(Beverage.class);
                    if (beverage != null){
                        //Her you got the data as array list
                        beverageList.add(beverage);
                    }
                }
            }
        } 
    }
    @Override
    public void onCancelled(@NonNull DatabaseError databaseError) {
        Log.i("???","Db error: "   databaseError.getMessage());
    }
});

CodePudding user response：

You need to put child of beverages here like 0,1,2, or 3.

reference.child("beverages").child("3").child("item_count").setValue(count);