How do i display elements from Firebase such as "FIELD1" in android?

Question

As the title says, i just cannot find a solution. What I've tried so far, results in no success.

Here's a link to an image below.

Answer 1

If you want to get only the value of the FIELD1 property under node 7, please use the following code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference fieldOneRef = rootRef.child("Ada").child("7").child("FIELD1");
ValueEventListener valueEventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        String field1 = dataSnapshot.getValue(String.class);
        Log.d(TAG, field1);
    }

    @Override
    public void onCancelled(@NonNull DatabaseError databaseError) {
        Log.d(TAG, databaseError.getMessage());
    }
};
fieldOneRef.addListenerForSingleValueEvent(valueEventListener);

And if you want to get the value of the FIELD1 property under all nodes, please use the following code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference adaRef = rootRef.child("Ada");
ValueEventListener valueEventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String field1 = ds.child("FIELD1").getValue(String.class);
            Log.d(TAG, field1);
        }
    }

    @Override
    public void onCancelled(@NonNull DatabaseError databaseError) {
        Log.d(TAG, databaseError.getMessage());
    }
};
adaRef.addListenerForSingleValueEvent(valueEventListener);