Wrong if statement condition

Question

I have 2 recyclerview. I want to add different types of book images to different lines in the horizontal plane. But when I add a book, it is added to both of recyclerview. Where's my mistake?

for loop:

for (DataSnapshot ds : dataSnapshot.getChildren()) {
                        HashMap<String, String> hashMap = (HashMap<String, String>) ds.getValue();

                        mBaslik.add(hashMap.get("baslik"));
                        mFotoUrl.add(hashMap.get("downloadurl"));

                        if(hashMap.get("baslik").equals("Roman")){
                            initRecyclerView();
                        }
                        else if(hashMap.get("baslik").equals("Hikaye")){
                            initRecyclerView2();

                        }

                    }

possible duplicate https://stackoverflow.com/q/218384/8035209 — ZarNi Myo Sett Win, Aug 29 '19 at 08:17
Try this if(hashMap.get("baslik") != null && hashMap.get("baslik").equals("Roman")) — Anas Mehar, Aug 29 '19 at 08:17
No Anas. Start with the string literal when comparing with equals. `"Roman".equals(hashMap.get("baslik"))`, that way you avoid the NPE and the extra != null check. — Old Schooled, Aug 29 '19 at 08:19

score 1 · Answer 1 · answered Aug 29 '19 at 08:23

1

hashMap.get("baslik") result is null, The equals method belongs to java.lang.String

you can:

"Roman".equals(hashMap.get("baslik"))

answered Aug 29 '19 at 08:23

ZLRab

41
5

It doesn't work exactly right. When I added two books, it added the novel to the first recyclerview. Secondly I added the story, this time added two books to two recyclerview. – Enes Aug 29 '19 at 08:36
@Old Schooled , How can we fix this issue? – Enes Aug 29 '19 at 08:45
This is just a solution to your "java.lang.NullPointerException" problem. – ZLRab Aug 30 '19 at 09:43
How can I edit this question to it does not dublicate question? – Enes Aug 31 '19 at 12:14

Wrong if statement condition

1 Answers1