Styjun

I have a function where I initialize all the data from firebase, also i make them availiable for real DB ,but when the data are updated, i want to delete all data from realm and save the new ones, when i try to do that it crashes because onDataChange tries to perform an action on a deleted object

public void initSettings()
 TextView tv = findViewById(R.id.updateInfo);
 tv.setText(updateValue);
 Button bu = findViewById(R.id.updateB);

 bu.setOnClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View v) 
 clearRealm();
 initRealmData();
 
 );







public void initRealmData()
 RealmResults<ChapterInfo> realmChapter = realm.where(ChapterInfo.class).findAll();
 RealmResults<ArticleInfo> realmArticle = realm.where(ArticleInfo.class).findAll();
 RealmResults<SectionInfo> realmSection = realm.where(SectionInfo.class).findAll();


 if(realmChapter.size() > 0)
 ciA.addAll(realmChapter);
 siA.addAll(realmSection);
 aiA.addAll(realmArticle);

 Collections.sort(siA);
 Collections.sort(aiA);
 Collections.sort(ciA);

 System.out.print("ADDING DATA FROM REALM");

 else
 System.out.println("DEN EXEI DATA TO REALM");
 initData();
 





public void clearRealm()
 for(int i =0 ; i <ciA.size();i++) ciA.remove(i);
 for(int i =0 ; i <siA.size();i++) siA.remove(i);
 for(int i =0 ; i <aiA.size();i++) aiA.remove(i);

 realm.beginTransaction();

 RealmResults<ChapterInfo> ci = realm.where(ChapterInfo.class).findAll();
 if(ci.size() >0)
 ci.deleteAllFromRealm();
 RealmResults<ArticleInfo> ai = realm.where(ArticleInfo.class).findAll();
 if(ai.size()>0)
 ai.deleteAllFromRealm();
 RealmResults<SectionInfo> si = realm.where(SectionInfo.class).findAll();
 if(si.size() > 0)
 si.deleteAllFromRealm();

 realm.commitTransaction();





public void initData()
 setContentView(R.layout.activity_main);

 pb = findViewById(R.id.progressBar);
 pb.setVisibility(View.VISIBLE);

 DatabaseReference myRef2 = FirebaseDatabase.getInstance().getReference();
 myRef2.addListenerForSingleValueEvent(new ValueEventListener() 
 @Override
 public void onDataChange(DataSnapshot snapshot) 

 for(DataSnapshot ds : snapshot.child("sections").getChildren())
 String key = ds.getKey();
 SectionInfo siTmp = new SectionInfo();
 siTmp.setTitle(snapshot.child("sections").child(key).getValue(SectionInfo.class).getTitle());
 siTmp.setOrder(snapshot.child("sections").child(key).getValue(SectionInfo.class).getOrder());
 siTmp.setKey(key);
 //siA.add(siTmp);
 realm.beginTransaction();
 final SectionInfo siR = realm.createObject(SectionInfo.class);

 siR.setKey(siTmp.getKey());
 siR.setTitle(siTmp.getTitle());
 siR.setOrder(siTmp.getOrder());


 realm.commitTransaction();

 

 for(DataSnapshot ds : snapshot.child("chapters").getChildren())

 String key = ds.getKey();
 ChapterInfo ciTmp = new ChapterInfo();
 ciTmp.setTitle(snapshot.child("chapters").child(key).getValue(ChapterInfo.class).getTitle());
 ciTmp.setOrder(snapshot.child("chapters").child(key).getValue(ChapterInfo.class).getOrder());
 ciTmp.setSection(snapshot.child("chapters").child(key).getValue(ChapterInfo.class).getSection());
 ciTmp.setKey(key);
 //ciA.add(ciTmp);
 realm.beginTransaction();
 final ChapterInfo ciR = realm.createObject(ChapterInfo.class);

 ciR.setKey(key);
 ciR.setTitle(ciTmp.getTitle());
 ciR.setOrder(ciTmp.getOrder());
 ciR.setSection(ciTmp.getSection());


 realm.commitTransaction();


 

 for(DataSnapshot ds : snapshot.child("articles").getChildren())

 String key = ds.getKey();

 ArticleInfo aiTmp = new ArticleInfo();
 aiTmp.setTitle(snapshot.child("articles").child(key).getValue(ArticleInfo.class).getTitle());
 aiTmp.setOrder(snapshot.child("articles").child(key).getValue(ArticleInfo.class).getOrder());
 aiTmp.setChapter(snapshot.child("articles").child(key).getValue(ArticleInfo.class).getChapter());
 aiTmp.setKey(key);
 //aiA.add(aiTmp);
 realm.beginTransaction();
 final ArticleInfo aiR = realm.createObject(ArticleInfo.class);

 aiR.setTitle(aiTmp.getTitle());
 aiR.setOrder(aiTmp.getOrder());
 aiR.setChapter(aiTmp.getChapter());
 aiR.setKey(key);

 realm.commitTransaction();


 
 pb.setVisibility(View.GONE);
 codeCreated();


 
 @Override
 public void onCancelled(DatabaseError databaseError) 

 
 );