Paging Library - updating data yields IndexOutOfBoundsException
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Multi tool use
I'm trying to implement RecyclerView
with pagination and ability to remove particular items from it, but getting IndexOutOfBoundsException
when supplying a new snapshot of data to PagedListAdapter
In my implementation, I keep data in memory and if there is a deletion I remove data in the list and initialize newly created datasource after invalidation with modified list. New snapshot has fewer elements than the old one, which is the cause for the exception as I think.
Interesting fact is when there is a deletion for the first time or just update to the item it works but for the second deletion I get IndexOutOfBoundsException
In activity:
RecyclerView rv = binding.rvListInbox;
rv.setLayoutManager(new LinearLayoutManager(this));
ListEmailAdapter listEmailAdapter = new ListEmailAdapter();
viewModel.getMailsList().observe(this, listEmailAdapter::submitList);
rv.setAdapter(listEmailAdapter);
ViewModel:
class ListEmailViewModel extends ViewModel {
private static final int PAGE_SIZE = 12;
private LiveData<PagedList<Mails>> mMailsList;
private MailListRepository mailListRepository;
private MailDataSourceFactory mailDataSourceFactory;
ListEmailViewModel(String folder) {
mailListRepository = new MailListRepository(folder);
mailDataSourceFactory = new MailDataSourceFactory(mailListRepository);
PagedList.Config config = new PagedList.Config.Builder()
.setEnablePlaceholders(false)
.setPageSize(PAGE_SIZE)
.setPrefetchDistance(36)
.build();
mMailsList = new LivePagedListBuilder<>(mailDataSourceFactory, config).build();
}
LiveData<PagedList<Mails>> getMailsList() {
return mMailsList;
}
@Override
protected void onCleared() {
super.onCleared();
mailListRepository.onCleared();
}
void removeMailAt(int mailIndex) {
mailListRepository.removeMailAt(mailIndex);
mailDataSourceFactory.getSource().invalidate();
}
}
Datasource
public class MailDataSource extends PageKeyedDataSource<Integer, Mails> {
private MailListRepository mailListRepository;
MailDataSource(MailListRepository mailListRepository) {
this.mailListRepository = mailListRepository;
}
@Override
public void loadInitial(@NonNull LoadInitialParams<Integer> params, @NonNull LoadInitialCallback<Integer, Mails> callback) {
mailListRepository.loadInitial(mailList -> callback.onResult(mailList, null, null));
}
@Override
public void loadBefore(@NonNull LoadParams<Integer> params, @NonNull LoadCallback<Integer, Mails> callback) {
}
@Override
public void loadAfter(@NonNull LoadParams<Integer> params, @NonNull LoadCallback<Integer, Mails> callback) {
mailListRepository.loadAfter(mailList -> callback.onResult(mailList, null));
}
}
Repository
public class MailListRepository {
private static int INITIAL_PAGE = 1;
private String folder;
private ArrayList<Mails> mailsList = new ArrayList<>();
private int nextPage = INITIAL_PAGE;
private boolean hasNextPage = true;
private Subscription subscription;
public MailListRepository(String folder) {
this.folder = folder;
}
public void removeMailAt(int mailIndex) {
mailsList.remove(mailIndex);
}
public interface OnMailListCallback {
void mailListData(List<Mails> mailList);
}
public void loadInitial(OnMailListCallback onMailListCallback) {
if(!mailsList.isEmpty()) onMailListCallback.mailListData(mailsList);
else fetchMail(onMailListCallback);
}
public void loadAfter(OnMailListCallback onMailListCallback) {
fetchMail(onMailListCallback);
}
private void fetchMail(OnMailListCallback onMailListCallback){
if(!hasNextPage) return;
subscription = ApiRequest.getInstance().getApi().getMailList(folder, nextPage)
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(mails -> {
mailsList.addAll(mails.getMails());
nextPage++;
hasNextPage = nextPage < mails.getPagination().getTotalPages();
onMailListCallback.mailListData(mails.getMails());
}, Throwable::printStackTrace);
}
public void onCleared(){
subscription.unsubscribe();
}
}
DataSourceFactory
public class MailDataSourceFactory extends DataSource.Factory<Integer, Mails> {
private MailListRepository mailListRepository;
private MailDataSource source;
private MutableLiveData<MailDataSource> mSourceLiveData =
new MutableLiveData<>();
public MailDataSourceFactory(MailListRepository mailListRepository) {
this.mailListRepository = mailListRepository;
}
@Override
public DataSource<Integer, Mails> create() {
source = new MailDataSource(mailListRepository);
mSourceLiveData.postValue(source);
return source;
}
public MailDataSource getSource() {
return source;
}
}
Diff callback in PagedListAdapter
private static DiffUtil.ItemCallback<Mails> DIFF_CALLBACK =
new DiffUtil.ItemCallback<Mails>() {
@Override
public boolean areItemsTheSame(Mails oldMails, Mails newMails) {
return oldMails.getUid() == newMails.getUid();
}
@Override
public boolean areContentsTheSame(Mails oldMails,
Mails newMails) {
return true;
}
};
}
android indexoutofboundsexception android-paging
New contributor
Roman Bodnarchuk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I'm trying to implement RecyclerView
with pagination and ability to remove particular items from it, but getting IndexOutOfBoundsException
when supplying a new snapshot of data to PagedListAdapter
In my implementation, I keep data in memory and if there is a deletion I remove data in the list and initialize newly created datasource after invalidation with modified list. New snapshot has fewer elements than the old one, which is the cause for the exception as I think.
Interesting fact is when there is a deletion for the first time or just update to the item it works but for the second deletion I get IndexOutOfBoundsException
In activity:
RecyclerView rv = binding.rvListInbox;
rv.setLayoutManager(new LinearLayoutManager(this));
ListEmailAdapter listEmailAdapter = new ListEmailAdapter();
viewModel.getMailsList().observe(this, listEmailAdapter::submitList);
rv.setAdapter(listEmailAdapter);
ViewModel:
class ListEmailViewModel extends ViewModel {
private static final int PAGE_SIZE = 12;
private LiveData<PagedList<Mails>> mMailsList;
private MailListRepository mailListRepository;
private MailDataSourceFactory mailDataSourceFactory;
ListEmailViewModel(String folder) {
mailListRepository = new MailListRepository(folder);
mailDataSourceFactory = new MailDataSourceFactory(mailListRepository);
PagedList.Config config = new PagedList.Config.Builder()
.setEnablePlaceholders(false)
.setPageSize(PAGE_SIZE)
.setPrefetchDistance(36)
.build();
mMailsList = new LivePagedListBuilder<>(mailDataSourceFactory, config).build();
}
LiveData<PagedList<Mails>> getMailsList() {
return mMailsList;
}
@Override
protected void onCleared() {
super.onCleared();
mailListRepository.onCleared();
}
void removeMailAt(int mailIndex) {
mailListRepository.removeMailAt(mailIndex);
mailDataSourceFactory.getSource().invalidate();
}
}
Datasource
public class MailDataSource extends PageKeyedDataSource<Integer, Mails> {
private MailListRepository mailListRepository;
MailDataSource(MailListRepository mailListRepository) {
this.mailListRepository = mailListRepository;
}
@Override
public void loadInitial(@NonNull LoadInitialParams<Integer> params, @NonNull LoadInitialCallback<Integer, Mails> callback) {
mailListRepository.loadInitial(mailList -> callback.onResult(mailList, null, null));
}
@Override
public void loadBefore(@NonNull LoadParams<Integer> params, @NonNull LoadCallback<Integer, Mails> callback) {
}
@Override
public void loadAfter(@NonNull LoadParams<Integer> params, @NonNull LoadCallback<Integer, Mails> callback) {
mailListRepository.loadAfter(mailList -> callback.onResult(mailList, null));
}
}
Repository
public class MailListRepository {
private static int INITIAL_PAGE = 1;
private String folder;
private ArrayList<Mails> mailsList = new ArrayList<>();
private int nextPage = INITIAL_PAGE;
private boolean hasNextPage = true;
private Subscription subscription;
public MailListRepository(String folder) {
this.folder = folder;
}
public void removeMailAt(int mailIndex) {
mailsList.remove(mailIndex);
}
public interface OnMailListCallback {
void mailListData(List<Mails> mailList);
}
public void loadInitial(OnMailListCallback onMailListCallback) {
if(!mailsList.isEmpty()) onMailListCallback.mailListData(mailsList);
else fetchMail(onMailListCallback);
}
public void loadAfter(OnMailListCallback onMailListCallback) {
fetchMail(onMailListCallback);
}
private void fetchMail(OnMailListCallback onMailListCallback){
if(!hasNextPage) return;
subscription = ApiRequest.getInstance().getApi().getMailList(folder, nextPage)
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(mails -> {
mailsList.addAll(mails.getMails());
nextPage++;
hasNextPage = nextPage < mails.getPagination().getTotalPages();
onMailListCallback.mailListData(mails.getMails());
}, Throwable::printStackTrace);
}
public void onCleared(){
subscription.unsubscribe();
}
}
DataSourceFactory
public class MailDataSourceFactory extends DataSource.Factory<Integer, Mails> {
private MailListRepository mailListRepository;
private MailDataSource source;
private MutableLiveData<MailDataSource> mSourceLiveData =
new MutableLiveData<>();
public MailDataSourceFactory(MailListRepository mailListRepository) {
this.mailListRepository = mailListRepository;
}
@Override
public DataSource<Integer, Mails> create() {
source = new MailDataSource(mailListRepository);
mSourceLiveData.postValue(source);
return source;
}
public MailDataSource getSource() {
return source;
}
}
Diff callback in PagedListAdapter
private static DiffUtil.ItemCallback<Mails> DIFF_CALLBACK =
new DiffUtil.ItemCallback<Mails>() {
@Override
public boolean areItemsTheSame(Mails oldMails, Mails newMails) {
return oldMails.getUid() == newMails.getUid();
}
@Override
public boolean areContentsTheSame(Mails oldMails,
Mails newMails) {
return true;
}
};
}
android indexoutofboundsexception android-paging
New contributor
Roman Bodnarchuk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
Show us a minimal code example for this problem
– Jeroen Heier
Dec 27 '18 at 16:49
@JeroenHeier added code
– Roman Bodnarchuk
Dec 28 '18 at 10:58
add a comment |
I'm trying to implement RecyclerView
with pagination and ability to remove particular items from it, but getting IndexOutOfBoundsException
when supplying a new snapshot of data to PagedListAdapter
In my implementation, I keep data in memory and if there is a deletion I remove data in the list and initialize newly created datasource after invalidation with modified list. New snapshot has fewer elements than the old one, which is the cause for the exception as I think.
Interesting fact is when there is a deletion for the first time or just update to the item it works but for the second deletion I get IndexOutOfBoundsException
In activity:
RecyclerView rv = binding.rvListInbox;
rv.setLayoutManager(new LinearLayoutManager(this));
ListEmailAdapter listEmailAdapter = new ListEmailAdapter();
viewModel.getMailsList().observe(this, listEmailAdapter::submitList);
rv.setAdapter(listEmailAdapter);
ViewModel:
class ListEmailViewModel extends ViewModel {
private static final int PAGE_SIZE = 12;
private LiveData<PagedList<Mails>> mMailsList;
private MailListRepository mailListRepository;
private MailDataSourceFactory mailDataSourceFactory;
ListEmailViewModel(String folder) {
mailListRepository = new MailListRepository(folder);
mailDataSourceFactory = new MailDataSourceFactory(mailListRepository);
PagedList.Config config = new PagedList.Config.Builder()
.setEnablePlaceholders(false)
.setPageSize(PAGE_SIZE)
.setPrefetchDistance(36)
.build();
mMailsList = new LivePagedListBuilder<>(mailDataSourceFactory, config).build();
}
LiveData<PagedList<Mails>> getMailsList() {
return mMailsList;
}
@Override
protected void onCleared() {
super.onCleared();
mailListRepository.onCleared();
}
void removeMailAt(int mailIndex) {
mailListRepository.removeMailAt(mailIndex);
mailDataSourceFactory.getSource().invalidate();
}
}
Datasource
public class MailDataSource extends PageKeyedDataSource<Integer, Mails> {
private MailListRepository mailListRepository;
MailDataSource(MailListRepository mailListRepository) {
this.mailListRepository = mailListRepository;
}
@Override
public void loadInitial(@NonNull LoadInitialParams<Integer> params, @NonNull LoadInitialCallback<Integer, Mails> callback) {
mailListRepository.loadInitial(mailList -> callback.onResult(mailList, null, null));
}
@Override
public void loadBefore(@NonNull LoadParams<Integer> params, @NonNull LoadCallback<Integer, Mails> callback) {
}
@Override
public void loadAfter(@NonNull LoadParams<Integer> params, @NonNull LoadCallback<Integer, Mails> callback) {
mailListRepository.loadAfter(mailList -> callback.onResult(mailList, null));
}
}
Repository
public class MailListRepository {
private static int INITIAL_PAGE = 1;
private String folder;
private ArrayList<Mails> mailsList = new ArrayList<>();
private int nextPage = INITIAL_PAGE;
private boolean hasNextPage = true;
private Subscription subscription;
public MailListRepository(String folder) {
this.folder = folder;
}
public void removeMailAt(int mailIndex) {
mailsList.remove(mailIndex);
}
public interface OnMailListCallback {
void mailListData(List<Mails> mailList);
}
public void loadInitial(OnMailListCallback onMailListCallback) {
if(!mailsList.isEmpty()) onMailListCallback.mailListData(mailsList);
else fetchMail(onMailListCallback);
}
public void loadAfter(OnMailListCallback onMailListCallback) {
fetchMail(onMailListCallback);
}
private void fetchMail(OnMailListCallback onMailListCallback){
if(!hasNextPage) return;
subscription = ApiRequest.getInstance().getApi().getMailList(folder, nextPage)
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(mails -> {
mailsList.addAll(mails.getMails());
nextPage++;
hasNextPage = nextPage < mails.getPagination().getTotalPages();
onMailListCallback.mailListData(mails.getMails());
}, Throwable::printStackTrace);
}
public void onCleared(){
subscription.unsubscribe();
}
}
DataSourceFactory
public class MailDataSourceFactory extends DataSource.Factory<Integer, Mails> {
private MailListRepository mailListRepository;
private MailDataSource source;
private MutableLiveData<MailDataSource> mSourceLiveData =
new MutableLiveData<>();
public MailDataSourceFactory(MailListRepository mailListRepository) {
this.mailListRepository = mailListRepository;
}
@Override
public DataSource<Integer, Mails> create() {
source = new MailDataSource(mailListRepository);
mSourceLiveData.postValue(source);
return source;
}
public MailDataSource getSource() {
return source;
}
}
Diff callback in PagedListAdapter
private static DiffUtil.ItemCallback<Mails> DIFF_CALLBACK =
new DiffUtil.ItemCallback<Mails>() {
@Override
public boolean areItemsTheSame(Mails oldMails, Mails newMails) {
return oldMails.getUid() == newMails.getUid();
}
@Override
public boolean areContentsTheSame(Mails oldMails,
Mails newMails) {
return true;
}
};
}
android indexoutofboundsexception android-paging
New contributor
Roman Bodnarchuk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I'm trying to implement RecyclerView
with pagination and ability to remove particular items from it, but getting IndexOutOfBoundsException
when supplying a new snapshot of data to PagedListAdapter
In my implementation, I keep data in memory and if there is a deletion I remove data in the list and initialize newly created datasource after invalidation with modified list. New snapshot has fewer elements than the old one, which is the cause for the exception as I think.
Interesting fact is when there is a deletion for the first time or just update to the item it works but for the second deletion I get IndexOutOfBoundsException
In activity:
RecyclerView rv = binding.rvListInbox;
rv.setLayoutManager(new LinearLayoutManager(this));
ListEmailAdapter listEmailAdapter = new ListEmailAdapter();
viewModel.getMailsList().observe(this, listEmailAdapter::submitList);
rv.setAdapter(listEmailAdapter);
ViewModel:
class ListEmailViewModel extends ViewModel {
private static final int PAGE_SIZE = 12;
private LiveData<PagedList<Mails>> mMailsList;
private MailListRepository mailListRepository;
private MailDataSourceFactory mailDataSourceFactory;
ListEmailViewModel(String folder) {
mailListRepository = new MailListRepository(folder);
mailDataSourceFactory = new MailDataSourceFactory(mailListRepository);
PagedList.Config config = new PagedList.Config.Builder()
.setEnablePlaceholders(false)
.setPageSize(PAGE_SIZE)
.setPrefetchDistance(36)
.build();
mMailsList = new LivePagedListBuilder<>(mailDataSourceFactory, config).build();
}
LiveData<PagedList<Mails>> getMailsList() {
return mMailsList;
}
@Override
protected void onCleared() {
super.onCleared();
mailListRepository.onCleared();
}
void removeMailAt(int mailIndex) {
mailListRepository.removeMailAt(mailIndex);
mailDataSourceFactory.getSource().invalidate();
}
}
Datasource
public class MailDataSource extends PageKeyedDataSource<Integer, Mails> {
private MailListRepository mailListRepository;
MailDataSource(MailListRepository mailListRepository) {
this.mailListRepository = mailListRepository;
}
@Override
public void loadInitial(@NonNull LoadInitialParams<Integer> params, @NonNull LoadInitialCallback<Integer, Mails> callback) {
mailListRepository.loadInitial(mailList -> callback.onResult(mailList, null, null));
}
@Override
public void loadBefore(@NonNull LoadParams<Integer> params, @NonNull LoadCallback<Integer, Mails> callback) {
}
@Override
public void loadAfter(@NonNull LoadParams<Integer> params, @NonNull LoadCallback<Integer, Mails> callback) {
mailListRepository.loadAfter(mailList -> callback.onResult(mailList, null));
}
}
Repository
public class MailListRepository {
private static int INITIAL_PAGE = 1;
private String folder;
private ArrayList<Mails> mailsList = new ArrayList<>();
private int nextPage = INITIAL_PAGE;
private boolean hasNextPage = true;
private Subscription subscription;
public MailListRepository(String folder) {
this.folder = folder;
}
public void removeMailAt(int mailIndex) {
mailsList.remove(mailIndex);
}
public interface OnMailListCallback {
void mailListData(List<Mails> mailList);
}
public void loadInitial(OnMailListCallback onMailListCallback) {
if(!mailsList.isEmpty()) onMailListCallback.mailListData(mailsList);
else fetchMail(onMailListCallback);
}
public void loadAfter(OnMailListCallback onMailListCallback) {
fetchMail(onMailListCallback);
}
private void fetchMail(OnMailListCallback onMailListCallback){
if(!hasNextPage) return;
subscription = ApiRequest.getInstance().getApi().getMailList(folder, nextPage)
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(mails -> {
mailsList.addAll(mails.getMails());
nextPage++;
hasNextPage = nextPage < mails.getPagination().getTotalPages();
onMailListCallback.mailListData(mails.getMails());
}, Throwable::printStackTrace);
}
public void onCleared(){
subscription.unsubscribe();
}
}
DataSourceFactory
public class MailDataSourceFactory extends DataSource.Factory<Integer, Mails> {
private MailListRepository mailListRepository;
private MailDataSource source;
private MutableLiveData<MailDataSource> mSourceLiveData =
new MutableLiveData<>();
public MailDataSourceFactory(MailListRepository mailListRepository) {
this.mailListRepository = mailListRepository;
}
@Override
public DataSource<Integer, Mails> create() {
source = new MailDataSource(mailListRepository);
mSourceLiveData.postValue(source);
return source;
}
public MailDataSource getSource() {
return source;
}
}
Diff callback in PagedListAdapter
private static DiffUtil.ItemCallback<Mails> DIFF_CALLBACK =
new DiffUtil.ItemCallback<Mails>() {
@Override
public boolean areItemsTheSame(Mails oldMails, Mails newMails) {
return oldMails.getUid() == newMails.getUid();
}
@Override
public boolean areContentsTheSame(Mails oldMails,
Mails newMails) {
return true;
}
};
}
android indexoutofboundsexception android-paging
android indexoutofboundsexception android-paging
New contributor
Roman Bodnarchuk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Roman Bodnarchuk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited Dec 28 '18 at 10:56
New contributor
Roman Bodnarchuk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 27 '18 at 16:35
Roman Bodnarchuk
11
11
New contributor
Roman Bodnarchuk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Roman Bodnarchuk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Roman Bodnarchuk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
Show us a minimal code example for this problem
– Jeroen Heier
Dec 27 '18 at 16:49
@JeroenHeier added code
– Roman Bodnarchuk
Dec 28 '18 at 10:58
add a comment |
1
Show us a minimal code example for this problem
– Jeroen Heier
Dec 27 '18 at 16:49
@JeroenHeier added code
– Roman Bodnarchuk
Dec 28 '18 at 10:58
1
1
Show us a minimal code example for this problem
– Jeroen Heier
Dec 27 '18 at 16:49
Show us a minimal code example for this problem
– Jeroen Heier
Dec 27 '18 at 16:49
@JeroenHeier added code
– Roman Bodnarchuk
Dec 28 '18 at 10:58
@JeroenHeier added code
– Roman Bodnarchuk
Dec 28 '18 at 10:58
add a comment |
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Roman Bodnarchuk is a new contributor. Be nice, and check out our Code of Conduct.
Roman Bodnarchuk is a new contributor. Be nice, and check out our Code of Conduct.
Roman Bodnarchuk is a new contributor. Be nice, and check out our Code of Conduct.
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1
Show us a minimal code example for this problem
– Jeroen Heier
Dec 27 '18 at 16:49
@JeroenHeier added code
– Roman Bodnarchuk
Dec 28 '18 at 10:58