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internal class ItemDataSource() : PageKeyedDataSource() {
override fun loadInitial(params: LoadInitialParams, callback: LoadInitialCallback) {
}
override fun loadAfter(params: LoadParams, callback: LoadCallback) {
}
override fun loadBefore(params: LoadParams, callback: LoadCallback) {
}
}
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internal class ItemDataSource(
private val itemRepository: ItemRepository
) : PageKeyedDataSource() {
private val dataSourceScope = CoroutineScope(Main + Job())
override fun loadInitial(params: LoadInitialParams, callback: LoadInitialCallback) {
dataSourceScope.launch {
callback.onResult(
itemRepository.findAll(page = 0),
null,
1
)
}
}
override fun loadAfter(params: LoadParams, callback: LoadCallback) {
dataSourceScope.launch {
callback.onResult(
itemRepository.findAll(page = params.key),
params.key + 1
)
}
}
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internal class ItemDataSource(
private val itemRepository: ItemRepository
) : PageKeyedDataSource() {
private val dataSourceScope = CoroutineScope(Main + Job())
override fun loadInitial(params: LoadInitialParams, callback: LoadInitialCallback) {
dataSourceScope.launch {
callback.onResult(
itemRepository.findAll(page = 0),
null,
1
)
}
}
override fun loadAfter(params: LoadParams, callback: LoadCallback) {
dataSourceScope.launch {
callback.onResult(
itemRepository.findAll(page = params.key),
params.key + 1
)
}
}
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internal class ItemDataSource(
private val itemRepository: ItemRepository
) : PageKeyedDataSource() {
private val dataSourceScope = CoroutineScope(Main + Job())
override fun loadInitial(params: LoadInitialParams, callback: LoadInitialCallback) {
dataSourceScope.launch {
callback.onResult(
itemRepository.findAll(page = 0),
null,
1
)
}
}
override fun loadAfter(params: LoadParams, callback: LoadCallback) {
dataSourceScope.launch {
callback.onResult(
itemRepository.findAll(page = params.key),
params.key + 1
)
}
}
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internal class ItemDataSourceFactory(
private val itemRepository: ItemRepository
) : DataSource.Factory() {
override fun create(): DataSource = ItemDataSource(itemRepository)
}
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internal class ItemViewModel(
itemRepository: ItemRepository
) : ViewModel() {
val itemPagedList = LivePagedListBuilder(
ItemDataSourceFactory(itemRepository),
PagedList.Config.Builder()
.setEnablePlaceholders(false)
.setPageSize(30)
.build()
).build()
}
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class ReadOnlyActivity : AppCompatActivity() {
private val viewModel: ItemViewModel by viewModels {
ItemViewModelFactory(ItemRepositoryImpl())
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = DataBindingUtil.setContentView(
this,
R.layout.activity_item_list
)
val adapter = ItemAdapter(this)
binding.recyclerView.adapter = adapter
viewModel.itemPagedList.observe(
this,
Observer {
adapter.submitList(it)
}
)
}
}
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class ReadOnlyActivity : AppCompatActivity() {
private val viewModel: ItemViewModel by viewModels {
ItemViewModelFactory(ItemRepositoryImpl())
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = DataBindingUtil.setContentView(
this,
R.layout.activity_item_list
)
val adapter = ItemAdapter(this)
binding.recyclerView.adapter = adapter
viewModel.itemPagedList.observe(
this,
Observer {
adapter.submitList(it)
}
)
}
}
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1BHFE-JTU"EBQUFS
internal class ItemAdapter(context: Context) : PagedListAdapter(ITEM_CALLBACK) {
companion object {
private val ITEM_CALLBACK = object : DiffUtil.ItemCallback() {
override fun areItemsTheSame(oldItem: Item, newItem: Item): Boolean = oldItem.id == newItem.id
override fun areContentsTheSame(oldItem: Item, newItem: Item): Boolean = oldItem == newItem
}
}
var onItemClickListener: OnItemClickListener? = null
private val inflater = LayoutInflater.from(context)
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemViewHolder =
ItemViewHolder.create(inflater, parent, false)
override fun onBindViewHolder(holder: ItemViewHolder, position: Int) =
holder.bind(getItem(position), onItemClickListener)
}
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internal class ItemAdapter(context: Context) : PagedListAdapter(ITEM_CALLBACK) {
companion object {
private val ITEM_CALLBACK = object : DiffUtil.ItemCallback() {
override fun areItemsTheSame(oldItem: Item, newItem: Item): Boolean = oldItem.id == newItem.id
override fun areContentsTheSame(oldItem: Item, newItem: Item): Boolean = oldItem == newItem
}
}
var onItemClickListener: OnItemClickListener? = null
private val inflater = LayoutInflater.from(context)
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemViewHolder =
ItemViewHolder.create(inflater, parent, false)
override fun onBindViewHolder(holder: ItemViewHolder, position: Int) =
holder.bind(getItem(position), onItemClickListener)
}
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internal class ItemViewModel(
private val itemRepository: ItemRepository
) : ViewModel() {
private val dataSourceFactory = ItemDataSourceFactory(itemRepository)
val itemPagedList = LivePagedListBuilder(
dataSourceFactory,
PagedList.Config.Builder().setEnablePlaceholders(false).setPageSize(30).build()
).build()
fun check(item: Item): Job = viewModelScope.launch {
itemRepository.store(item.copy(checked = true))
dataSourceFactory.sourceLiveData.value?.invalidate()
}
fun uncheck(item: Item): Job = viewModelScope.launch {
itemRepository.store(item.copy(checked = false))
dataSourceFactory.sourceLiveData.value?.invalidate()
}
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class NgActivity : AppCompatActivity() {
private val viewModel: ItemViewModel by viewModels {
ItemViewModelFactory(ItemRepositoryImpl())
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = DataBindingUtil.setContentView(
this,
R.layout.activity_item_list
)
val adapter = ItemAdapter(this).apply {
onItemClickListener = object : OnItemClickListener {
override fun onClick(item: Item) {
if (item.checked) {
viewModel.uncheck(item)
} else {
viewModel.check(item)
}
}
}
}
binding.recyclerView.adapter = adapter
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dataSource?.invalidate()
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dataSource?.invalidate()
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@Override
protected PagedList compute() {
@Nullable Key initializeKey = initialLoadKey;
if (mList != null) {
initializeKey = (Key) mList.getLastKey();
}
do {
if (mDataSource != null) {
mDataSource.removeInvalidatedCallback(mCallback);
}
mDataSource = dataSourceFactory.create();
mDataSource.addInvalidatedCallback(mCallback);
mList = new PagedList.Builder<>(mDataSource, config)
.setNotifyExecutor(notifyExecutor)
.setFetchExecutor(fetchExecutor)
.setBoundaryCallback(boundaryCallback)
.setInitialKey(initializeKey)
.build();
} while (mList.isDetached());
return mList;
}
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@Override
protected PagedList compute() {
@Nullable Key initializeKey = initialLoadKey;
if (mList != null) {
initializeKey = (Key) mList.getLastKey();
}
do {
if (mDataSource != null) {
mDataSource.removeInvalidatedCallback(mCallback);
}
mDataSource = dataSourceFactory.create();
mDataSource.addInvalidatedCallback(mCallback);
mList = new PagedList.Builder<>(mDataSource, config)
.setNotifyExecutor(notifyExecutor)
.setFetchExecutor(fetchExecutor)
.setBoundaryCallback(boundaryCallback)
.setInitialKey(initializeKey)
.build();
} while (mList.isDetached());
return mList;
}
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@Nullable Key initializeKey = initialLoadKey;
if (mList != null) {
initializeKey = (Key) mList.getLastKey();
}
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@Nullable
@Override
public Object getLastKey() {
return mDataSource.getKey(mLastLoad, mLastItem);
}
ContiguousPagedList
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@Nullable Key initializeKey = initialLoadKey;
if (mList != null) {
initializeKey = (Key) mList.getLastKey();
}
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public Object getLastKey() {
return mDataSource.getKey(mLastLoad, mLastItem);
}
ContiguousPagedList
PageKeyedDataSource
final Key getKey(int position, Value item) {
// don't attempt to persist keys, since we currently don't pass them to initial load
return null;
}
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@Nullable Key initializeKey = initialLoadKey;
if (mList != null) {
initializeKey = (Key) mList.getLastKey();
}
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public Object getLastKey() {
return mDataSource.getKey(mLastLoad, mLastItem);
}
ContiguousPagedList
PageKeyedDataSource
final Key getKey(int position, Value item) {
// don't attempt to persist keys, since we currently don't pass them to initial load
return null;
}
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@Dao
internal interface ItemDao {
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun upsert(items: ItemRecord)
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun bulkUpsert(items: List)
@Query("DELETE FROM item")
suspend fun deleteAll()
@Query("SELECT * FROM item")
fun selectAll(): DataSource.Factory
}
@Database(
entities = [ItemRecord::class],
version = 1,
exportSchema = false
)
internal abstract class InMemDatabase : RoomDatabase() {
companion object {
fun create(context: Context): InMemDatabase =
Room.inMemoryDatabaseBuilder(
context,
InMemDatabase::class.java
).fallbackToDestructiveMigration().build()
}
abstract fun itemDao(): ItemDao
}
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@Dao
internal interface ItemDao {
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun upsert(items: ItemRecord)
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun bulkUpsert(items: List)
@Query("DELETE FROM item")
suspend fun deleteAll()
@Query("SELECT * FROM item")
fun selectAll(): DataSource.Factory
}
@Database(
entities = [ItemRecord::class],
version = 1,
exportSchema = false
)
internal abstract class InMemDatabase : RoomDatabase() {
companion object {
fun create(context: Context): InMemDatabase =
Room.inMemoryDatabaseBuilder(
context,
InMemDatabase::class.java
).fallbackToDestructiveMigration().build()
}
abstract fun itemDao(): ItemDao
}
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internal class ItemBoundaryCallback(
private val itemRepository: ItemRepository,
private val inMemDatabase: InMemDatabase
) : PagedList.BoundaryCallback() {
private val boundaryCallbackScope = CoroutineScope(Main + Job())
override fun onZeroItemsLoaded() {
super.onZeroItemsLoaded()
if (pageList.isNotEmpty() && pageList[0].isEndPage) return
boundaryCallbackScope.launch {
val itemList = itemRepository.findAll(page = 0)
if (itemList.isNotEmpty()) {
bulkInsertToDatabase(itemList)
}
…
}
}
…
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internal class ItemViewModel(
private val itemRepository: ItemRepository,
private val inMemDatabase: InMemDatabase
) : ViewModel() {
val itemPagedList = LivePagedListBuilder(
inMemDatabase.itemDao().selectAll().map { ItemConverter.convertToItem(it) },
PagedList.Config.Builder()
.setEnablePlaceholders(false)
.setPageSize(30)
.build()
).setBoundaryCallback(
ItemBoundaryCallback(
itemRepository,
inMemDatabase
)
).build()
}
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class RoomActivity : AppCompatActivity() {
private val viewModel: ItemViewModel by viewModels {
ItemViewModelFactory(
ItemRepositoryImpl(),
InMemDatabase.create(this)
)
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = DataBindingUtil.setContentView(
this,
R.layout.activity_item_list
)
val adapter = ItemAdapter(this)
binding.recyclerView.adapter = adapter
viewModel.itemPagedList.observe(
this,
Observer {
adapter.submitList(it)
}
)
}
}
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internal class ItemViewModel(
private val itemRepository: ItemRepository,
private val inMemDatabase: InMemDatabase
) : ViewModel() {
…
fun check(item: Item): Job = viewModelScope.launch {
val newItem = item.copy(checked = true)
itemRepository.store(newItem)
inMemDatabase.itemDao().upsert(ItemConverter.convertToRecord(newItem))
}
fun uncheck(item: Item): Job = viewModelScope.launch {
val newItem = item.copy(checked = false)
itemRepository.store(newItem)
inMemDatabase.itemDao().upsert(ItemConverter.convertToRecord(newItem))
}
}
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internal data class Page(
val itemList: List,
val isEndPage: Boolean
)
internal class ItemDataProvider {
val sourceLiveData = MutableLiveData>()
private val _pageList = mutableListOf()
val pageList: List
get() = _pageList
fun addPage(page: Page) {
_pageList.add(page)
sourceLiveData.value?.invalidate()
}
fun update(item: Item) {
…
sourceLiveData.value?.invalidate()
}
}
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internal class ItemBoundaryCallback(
private val itemRepository: ItemRepository,
private val itemDataProvider: ItemDataProvider
) : PagedList.BoundaryCallback() {
private val boundaryCallbackScope = CoroutineScope(Dispatchers.Main + Job())
override fun onZeroItemsLoaded() {
super.onZeroItemsLoaded()
if (itemDataProvider.pageList.isNotEmpty() && itemDataProvider.pageList[0].isEndPage) return
boundaryCallbackScope.launch {
val itemList = itemRepository.findAll(page = 0)
itemDataProvider.addPage(
page = Page(
itemList = itemList,
isEndPage = itemList.isEmpty()
)
)
}
}
override fun onItemAtEndLoaded(itemAtEnd: Item) { … }
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internal class ItemViewModel(
private val itemRepository: ItemRepository,
private val itemDataProvider: ItemDataProvider
) : ViewModel() {
…
fun check(item: Item): Job = viewModelScope.launch {
val newItem = item.copy(checked = true)
itemRepository.store(newItem)
itemDataProvider.update(newItem)
}
fun uncheck(item: Item): Job = viewModelScope.launch {
val newItem = item.copy(checked = false)
itemRepository.store(newItem)
itemDataProvider.update(newItem)
}
}
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https://github.com/kgmyshin/paging-sample