Iam Facing Error : [ Expected a Map while deserializing, but got a class java.lang.Long ] For Long Time .. I Tried to solved but not work
That Is MainActivity.java
public class MainActivity extends AppCompatActivity{
Button add_Dialoge;
FloatingActionButton add;
EditText title_Dialoge , note_Dialoge;
ListView listViewNote;
String title , note , mId;
FirebaseDatabase mDataBase = FirebaseDatabase.getInstance();
DatabaseReference mRef = mDataBase.getReference("Notes");
ArrayList<Note> mNoteList = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
add = findViewById(R.id.BTN_Add);
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showAlertDialogeAddNote(); }
});
listViewNote = findViewById(R.id.LV_ListViewNote);
mNoteList = new ArrayList<>();
}
@Override
protected void onStart() {
super.onStart();
mRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot data) {
// That Run When I Want To Get Data From FireBase
for (DataSnapshot snapshot : data.getChildren()){
Note note = snapshot.getValue(Note.class);
mNoteList.add(note);
}
noteAdapter adapter = new noteAdapter(MainActivity.this , mNoteList);
listViewNote.setAdapter(adapter);
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
// That Run When Have Error
Log.e("The Read Failed Is .:. " ,error.getMessage());
}
});
}
void showAlertDialogeAddNote() {
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(MainActivity.this);
View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.layout_add_note , null);
title_Dialoge = view.findViewById(R.id.ET_Title_DialogAdd);
note_Dialoge = view.findViewById(R.id.ET_Note_DialogAdd);
add_Dialoge = view.findViewById(R.id.BTN_Add_DialogAdd);
add_Dialoge.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
title = title_Dialoge.getText().toString();
note = note_Dialoge.getText().toString();
if (title.isEmpty() && note.isEmpty()) {
Toast.makeText(MainActivity.this, "!! ERROR .. The Title Or Note Or Both Are Empty !!", Toast.LENGTH_LONG).show();
} else {
mId = mRef.push().getKey();
Note myNote = new Note(mId, title , note , ServerValue.TIMESTAMP);
mRef.child(mId).setValue(myNote);
}
}
});
alertBuilder.setView(view);
AlertDialog alertDialog = alertBuilder.create();
alertDialog.show();
}
}
And My Note Class Is :
public class Note {
public String id;
public String title , note;
public Map<String, String> time;
public Note() {
}
Note(String id, String title, String note, Map<String, String> time) {
this.id = id;
this.title = title;
this.note = note;
this.time = time;
}
And My Error Is .:.
Process: com.example.notewithfirebase, PID: 4831
com.google.firebase.database.DatabaseException: Expected a Map while deserializing, but got a class java.lang.Long
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.expectMap(com.google.firebase:firebase-database@@19.2.1:344)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToParameterizedType(com.google.firebase:firebase-database@@19.2.1:261)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToType(com.google.firebase:firebase-database@@19.2.1:176)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$100(com.google.firebase:firebase-database@@19.2.1:47)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.deserialize(com.google.firebase:firebase-database@@19.2.1:592)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.deserialize(com.google.firebase:firebase-database@@19.2.1:562)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertBean(com.google.firebase:firebase-database@@19.2.1:432)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass(com.google.firebase:firebase-database@@19.2.1:231)
at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertToCustomClass(com.google.firebase:firebase-database@@19.2.1:79)
at com.google.firebase.database.DataSnapshot.getValue(com.google.firebase:firebase-database@@19.2.1:203)
at com.example.notewithfirebase.MainActivity$2.onDataChange(MainActivity.java:67)
at com.google.firebase.database.core.ValueEventRegistration.fireEvent(com.google.firebase:firebase-database@@19.2.1:75)
at com.google.firebase.database.core.view.DataEvent.fire(com.google.firebase:firebase-database@@19.2.1:63)
at com.google.firebase.database.core.view.EventRaiser$1.run(com.google.firebase:firebase-database@@19.2.1:55)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
