Android, on finish loading data from firebase

Question

How to show the Progressbar on start of the activity that contains recycler view which should be hidden once the recycler view loads the data from firebase database?

Answer 1

You should give your code. But i will try to explain with my code. (My code use LovelyProgressDialog as ProgressBar, because i like the UI. But you can change with your prefered ProgressBar)

First, you can show the progress bar in onCreate method (or onCreateView if you use Fragment instead of Activity).

@Override
public View onCreate(Bundle savedInstanceState) {
        //Enter your code here
        dialogGetAllData.setCancelable(false)
                .setIcon(R.drawable.ic_add_friend)
                .setTitle("Get all friend....")
                .setTopColorRes(R.color.colorPrimary)
                .show();
        getListData();
}

Then after you get all of the data from firebase (it means the dataSnapshot already null), you dismiss your progress bar

    private void getListData() {
    FirebaseDatabase.getInstance().getReference().child("friend/" + StaticConfig.UID).addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if (dataSnapshot.getValue() != null) {
                HashMap mapRecord = (HashMap) dataSnapshot.getValue();
                Iterator listKey = mapRecord.keySet().iterator();
                while (listKey.hasNext()) {
                    String key = listKey.next().toString();
                    listFriendID.add(mapRecord.get(key).toString());
                }
            } else {
                dialogGetAllData.dismiss();
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
        }
    });
}