Getting below error while running code in Android Studio

Question

Getting below error while running code in Android Studio. Please help

E/UncaughtException: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object java.util.Map.get(java.lang.Object)' on a null object reference at com.example.pulkitrathi.maps.MapsActivity$4.onDataChange(MapsActivity.java:193)

public void onDataChange(DataSnapshot dataSnapshot) {
                  
Map<String, String> map_new = (Map<String, String>) dataSnapshot.getValue();

  line 193         image_path = map_new.get("image");

                  latitude = map_new.get("latitude");

                    longitude = map_new.get("longitude");

                    place = map_new.get("place");

Map should be declared before initialising `Map map_new = new HashMap<>();` — Vatsal kesarwani, Nov 28 '20 at 13:13
public void onDataChange(DataSnapshot dataSnapshot, String Map) @Vatsalkesarwani like this? — Amit Garg, Nov 28 '20 at 13:17
https://stackoverflow.com/questions/47847694/how-to-return-datasnapshot-value-as-a-result-of-a-method — , Nov 28 '20 at 13:17
No @AmitGarg make changes on the 2nd line where you have initialized the map with `dataSnapshot.getValue();` — Vatsal kesarwani, Nov 28 '20 at 13:22
@Vatsalkesarwani: Map map_new = new HashMap<>();dataSnapshot.getValue(); like this? — Amit Garg, Nov 28 '20 at 13:25
Does this answer your question? [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — a_local_nobody, Nov 28 '20 at 14:44

jana · Answer 1 · 2020-11-28T14:08:41.697

0

dataSnapshot.getValue() is returning null - you have to check that map_new is not null before trying to call any methods on it.

if (map_new != null) {
   image_path = map_new.get("image");
   latitude = map_new.get("latitude");
   longitude = map_new.get("longitude");
   place = map_new.get("place");
}

edited Nov 28 '20 at 14:08

answered Nov 28 '20 at 14:03

jana

256
1
4

Now getting below error: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.trim()' on a null object reference at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1838) at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110) at java.lang.Double.parseDouble(Double.java:538) at com.example.pulkitrathi.maps.MapsActivity$4.onDataChange(MapsActivity.java:200) LatLng latLng = new LatLng(Double.parseDouble(latitude), Double.parseDouble(longitude)); – Amit Garg Nov 28 '20 at 14:17
Could you please help – Amit Garg Nov 28 '20 at 14:33
1

i think you should read up on what a NullPointerException is, as a_local_nobody is suggesting above in the comments to your question - because this exchange will be endless otherwise. you need to ensure you don't call methods on a possible null object. – jana Nov 28 '20 at 15:09
Null pointer exception explanation: https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it#:~:text=A%20null%20pointer%20exception%20is,field%20of%20a%20null%20object. – private static Nov 28 '20 at 16:28

Getting below error while running code in Android Studio

1 Answers1