Just a copy of Google Paging library (https://developer.android.com/topic/libraries/architecture/paging) entirely rewritten in Kotlin and intended to be used with Realm.
To use RealmPagination you need to add as a dependency:
implementation 'com.github.magora-android:realmpagination:1.0.0'
And it's available on Jitpack, so you need to add
allprojects {
repositories {
// ...
maven { url "https://jitpack.io" }
}
// ...
}
First you need to create a DataSourceFactory
class UsersListDataSourceFactory : RealmDataSource.Factory<Int, User>() {
override fun create(): RealmDataSource<Int, User> {
val result = object : RealmPageKeyedDataSource<Int, User>() {
override fun loadInitial(params: LoadInitialParams<Int>, callback: LoadInitialCallback<Int, User>) {
//...
}
override fun loadBefore(params: LoadParams<Int>, callback: LoadCallback<Int, User>) {
callback.onResult(0, null)
}
override fun loadAfter(params: LoadParams<Int>, callback: LoadCallback<Int, User>) {
//...
}
}
return result
}
override fun destroy() {
//...
}
}
val dsFactory = UsersListDataSourceFactory()
Then you need to create a Paged List
private const val INITIAL_PAGE_SIZE = 50
private const val PAGE_SIZE = 30
private const val PREFETCH_DISTANCE = 10
val config = RealmPagedList.Config.Builder()
.setInitialLoadSizeHint(INITIAL_PAGE_SIZE)
.setPageSize(PAGE_SIZE)
.setPrefetchDistance(PREFETCH_DISTANCE)
.build()
val pagedList = RealmPagedListBuilder(dsFactory, config)
.setInitialLoadKey(0)
.setRealmData(localStorage.getUsers())
.build()
Then create an adapter
class AdapterUserList(data: RealmPagedList<*, User>) : BaseRealmListenableAdapter<User, RecyclerView.ViewHolder>(data) {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
//...
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
//...
}
}
val adapter = AdapterUserList(pagedList)
usersList.adapter = adapter
... and use the power of pagination
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