Develop Reference

ModelCategory model = dataSnapshot.getValue(ModelCategory.class); App get Crush

App Get Crushed....
error not showing in android studio but while I run the app it get crush and marked the error in
ModelCategory model = dataSnapshot.getValue(ModelCategory.class);
All code is correct but while I the app it get crushed.... the model name is same as in firebase storage but get crush.....
private void loadCategories() {
categoryArrayList = new ArrayList<>();
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Categories");
reference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
categoryArrayList.clear();
for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
ModelCategory model = dataSnapshot.getValue(ModelCategory.class);
categoryArrayList.add(model);
}
adapterCategory = new AdapterCategory(AdminDashboardActivity.this, categoryArrayList);
binding.categoriesRv.setAdapter(adapterCategory);
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
Model Category Class: all code is correct but app get crush......
public class ModelCategory {
String id, category, uid;
long timestamp;
public ModelCategory(String id, String category, String uid, long timestamp) {
this.id = id;
this.category = category;
this.uid = uid;
this.timestamp = timestamp;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
public long getTimestamp() {
return timestamp;
}
public void setTimestamp(long timestamp) {
this.timestamp = timestamp;
}
}
this is the logcat error is between stars linge
at com.google.firebase.database.DataSnapshot.getValue(DataSnapshot.java:203)
at **com.mohmand.library.AdminDashboardActivity$3.onDataChange(AdminDashboardActivity.java:78)**
at com.google.firebase.database.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:75)
at com.google.firebase.database.core.view.DataEvent.fire(DataEvent.java:63)
at com.google.firebase.database.core.view.EventRaiser$1.run(EventRaiser.java:55)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)

Please add an empty constructor.
Like this.
public class ModelCategory {
String id, category, uid;
long timestamp;
public ModelCategory(String id, String category, String uid, long timestamp) {
this.id = id;
this.category = category;
this.uid = uid;
this.timestamp = timestamp;
}
public ModelCategory() {
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public String getUid() {
return uid;
}
public void setUid(String uid) {
this.uid = uid;
}
public long getTimestamp() {
return timestamp;
}
public void setTimestamp(long timestamp) {
this.timestamp = timestamp;
}
}

Error while updating to Firebase Database

I'm having a problem while trying to update to Firebase real time database.
I'm getting the error "com.google.firebase.database.DatabaseException: Serializing Arrays is not supported, please use Lists instead
I think this might mean I need to use another way to update the data since I'm using a recyclerView instead of a listView, but since now I have:
public void update_button(){
databaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
snapshot.getRef().child("title").setValue(postTitleEdit.getText());
snapshot.getRef().child("desc").setValue(postTextEdit.getText());
Toast.makeText(CowDet.this, "updated", Toast.LENGTH_LONG).show();
CowDet.this.finish();
}
The way I'm using to add data to firebase is:
mDatabaseReference.addChildEventListener(new ChildEventListener() {
#Override
public void onChildAdded(#NonNull DataSnapshot snapshot, #Nullable String previousChildName) {
Blog blog = snapshot.getValue(Blog.class);
blogList.add(blog);
blogRecyclerAdapter = new BlogRecyclerAdapter(PostListActivity.this, blogList);
recyclerView.setAdapter(blogRecyclerAdapter);
blogRecyclerAdapter.notifyDataSetChanged();
}
Could someone help me update the data? I'm kinda stuck here.
Here is my Blog class:
public class Blog {
public String title;
public String desc;
public String image;
public String timestamp;
public String userid;
public Blog() {
}
public Blog(String title, String desc, String image, String timestamp, String userid, String milkQty, String note) {
this.title = title;
this.desc = desc;
this.image = image;
this.timestamp = timestamp;
this.userid = userid;
}
public Blog(String title, String desc) {
this.title = title;
this.desc = desc;
this.image = image;
this.timestamp = timestamp;
this.userid = userid;
}
public Blog(String toString) {
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public String getTimestamp() {
return timestamp;
}
public void setTimestamp(String timestamp) {
this.timestamp = timestamp;
}
public String getUserid() {
return userid;
}
public void setUserid(String userid) {
this.userid = userid;
}
}
new update_button
public void update_button(){
databaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
databaseReference.child("Mblog").child("title").setValue(postTitleEdit);
Toast.makeText(CowDet.this, "updated", Toast.LENGTH_LONG).show();
CowDet.this.finish();
}
new error: com.google.firebase.database.DatabaseException: Found conflicting getters for name: getText
I'm getting this error on the line databaseReference.child("Mblog").child("title").setValue(postTitleEdit);

The error message is pretty explicit. Your Blog class seems to contain an array (with []), which isn't supported by Firebase's serializer. You should instead use a List class for the same purpose.
If you're having a hard time making that work, edit your question to include the Blog class.

Firebase returning a null dataSnapshot when loading into nested objects

I'm trying to load an object from my database but the dataSnapshot is not returning anything. I have a structure like this:
This is my Event object:
public class Event implements Serializable {
private String eventName, eventDescription;
private Author author;
private Venue venue;
private ArrayList<Comment> comments;
private ArrayList<Like> likes;
public Event() {
}
public Event(#NonNull String eventName, String eventDescription, Author author, Venue venue) {
this.eventName = eventName;
this.eventDescription = eventDescription;
this.author = author;
this.venue = venue;
public String getEventName() {
return eventName;
}
public void setEventName(String eventName) {
this.eventName = eventName;
}
public Author getAuthor() {
return author;
}
public void setAuthor(Author author) {
this.author = author;
}
public Venue getVenue() {
return venue;
}
public void setVenue(Venue venue) {
this.venue = venue;
}
public String getEventDescription() {
return eventDescription;
}
public void setEventDescription(String eventDescription) {
this.eventDescription = eventDescription;
}
public List<Comment> getComments() {
return comments;
}
public void setComments(ArrayList<Comment> comments) {
this.comments = comments;
}
public List<Like> getLikes() {
return likes;
}
public void setLikes(ArrayList<Like> likes) {
this.likes = likes;
}
}
And this is my code:
Event event;
DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();
databaseReference.child("Event").child("0").addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
event = dataSnapshot.getValue(Event.class);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
The event object comes back as null even though I'm pretty sure the path is correct

Retrofit get List can't be worked into a String

While producing a list of my Entity I can't convert this to a String.
This is my Team code:
public class Teams {
#SerializedName("teamName")
#Expose
private String teamName;
#SerializedName("matches")
#Expose
private Object matches;
#SerializedName("players")
#Expose
private Object players;
#SerializedName("id")
#Expose
private Integer id;
public String getTeamName() {
return teamName;
}
public void setTeamName(String teamName) {
this.teamName = teamName;
}
public Object getMatches() {
return matches;
}
public void setMatches(Object matches) {
this.matches = matches;
}
public Object getPlayers() {
return players;
}
public void setPlayers(Object players) {
this.players = players;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
I'm using the following get:
public interface SoccerStatsApi {
String jsonUrl = "https://soccerstatsapp.azurewebsites.net/api/";
#GET("teams")
Call<List<Teams>> getTeams();`
And this is where I want to convert it to a complete string:
Call<List<Teams>> call = soccerStatsApi.getTeams();
call.enqueue(new Callback<List<Teams>>() {
#Override
public void onResponse(Call<List<Teams>> call, Response<List<Teams>> response) { }
Response().body().toString() only returns the initial string, not the actual object values in the List/response. I've checked everywhere, but so far no answer I can actually work with.

cast Response.body() to List.
for example:
'''List teams = (List)response.body() ;'''
hope you have configured retrofit to use Gson as default json parser

Getting an error "found conflicting getters" when trying to upload a message to a firebase database

I am using this library: https://github.com/stfalcon-studio/ChatKit to add chat to my app, i am getting this error when i try to upload a message to the firestore db:
FATAL EXCEPTION: main
Process: neoncore.com.onepiece, PID: 3907
java.lang.RuntimeException: Found conflicting getters for name getUser on class neoncore.com.onepiece.beans.chat.Message
at com.google.android.gms.internal.zzevb$zza.<init>(Unknown Source)
at com.google.android.gms.internal.zzevb.zzg(Unknown Source)
at com.google.android.gms.internal.zzevb.zza(Unknown Source)
at com.google.android.gms.internal.zzevb.zzbw(Unknown Source)
at com.google.firebase.firestore.zzk.zzcd(Unknown Source)
at com.google.firebase.firestore.CollectionReference.add(Unknown Source)
at neoncore.com.onepiece.activities.ChatDetail$1.onSubmit(ChatDetail.java:57)
at com.stfalcon.chatkit.messages.MessageInput.onSubmit(MessageInput.java:145)
at com.stfalcon.chatkit.messages.MessageInput.onClick(MessageInput.java:108)
at android.view.View.performClick(View.java:5210)
at android.view.View$PerformClick.run(View.java:21328)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5551)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
This is my updated message class:
public class Message implements IMessage,
MessageContentType.Image, /*this is for default image messages implementation*/
MessageContentType /*and this one is for custom content type (in this case - voice message)*/ {
private String id;
private String text;
private Date createdAt;
private User user;
private Image image;
private Voice voice;
public Message(String id, User user, String text) {
this(id, user, text, new Date());
}
public Message(String id, User user, String text, Date createdAt) {
this.id = id;
this.text = text;
this.user = user;
this.createdAt = createdAt;
}
#Override
public String getId() {
return id;
}
#Override
public String getText() {
return text;
}
#Override
public Date getCreatedAt() {
return createdAt;
}
#Override
public User getUser() {
return this.user;
}
#Override
public String getImageUrl() {
return image == null ? null : image.url;
}
public Voice getVoice() {
return voice;
}
public String getStatus() {
return "Sent";
}
public void setText(String text) {
this.text = text;
}
public void setCreatedAt(Date createdAt) {
this.createdAt = createdAt;
}
public void setImage(Image image) {
this.image = image;
}
public void setVoice(Voice voice) {
this.voice = voice;
}
public static class Image {
private String url;
public Image(String url) {
this.url = url;
}
}
public static class Voice {
private String url;
private int duration;
public Voice(String url, int duration) {
this.url = url;
this.duration = duration;
}
public String getUrl() {
return url;
}
public int getDuration() {
return duration;
}
}
}
and also my user class:
[public class User implements IUser {
private String id, name, avatar;
public User(String id, String name, String avatar) {
this.id = id;
this.name = name;
this.avatar = avatar;
}
public User() {
}
#Override
public String getId() {
return id;
}
#Override
public String getName() {
return name;
}
#Override
public String getAvatar() {
return avatar;
}
}][1]
this is the point where the error occurs:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat_detail);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FirebaseUser currentUser = FirebaseAuth.getInstance().getCurrentUser();
firebaseFirestore = FirebaseFirestore.getInstance();
final Author author = new Author(currentUser.getUid(),currentUser.getDisplayName(),currentUser.getPhotoUrl().toString());
messageMessagesListAdapter = new MessagesListAdapter<>(author.getId(),null);
messagesList = findViewById(R.id.messagesList);
inputView = findViewById(R.id.input);
inputView.setInputListener(new MessageInput.InputListener() {
#Override
public boolean onSubmit(CharSequence input) {
CollectionReference reference = firebaseFirestore.collection("Messages");
final Message message = new Message(author,input.toString(), "",null,new Date());
reference.add(message).addOnCompleteListener(new OnCompleteListener<DocumentReference>() {
#Override
public void onComplete(#NonNull Task<DocumentReference> task) {
messageMessagesListAdapter.addToStart(message,true);
}
}).addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception e) {
Log.d("MessageUPloadFailed",e.getMessage());
}
});
return true;
}
});
messagesList.setAdapter(messageMessagesListAdapter);
}
The error occurs at the point where i try to add the message to the firestore database where the add method is called.
database image

You are getting this error:
java.lang.RuntimeException: Found conflicting getters for name getUser on class Message
Because in Message class you have a getUser() method but you don't have a user field at all. You have instead an author field and the getter for this field should be:
#Override
public Author getAuthor() { //NOT getUser()
return author;
}