PageKeyedDataSource.LoadCallback
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android
abstract class PageKeyedDataSource.LoadCallback<Key : Any?, Value : Any?>
Callback for loadBefore and loadAfter to return data.
A callback can be called only once, and will throw if called again.
It is always valid for a DataSource loading method that takes a callback to stash the callback and call it later. This enables DataSources to be fully asynchronous, and to handle temporary, recoverable error states (such as a network error that can be retried).
| Parameters | |
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<Key : Any?> |
Type of data used to query pages. |
<Value : Any?> |
Type of items being loaded. |
Summary
Public constructors |
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<Key : Any?, Value : Any?> LoadCallback() |
android
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Public functions |
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abstract Unit |
Called to pass loaded data from a |
android
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Public constructors
Public functions
onResult
abstract fun onResult(data: List<Value>, adjacentPageKey: Key?): Unit
Called to pass loaded data from a DataSource.
Call this method from your PageKeyedDataSource's loadBefore and loadAfter methods to return data.
It is always valid to pass a different amount of data than what is requested. Pass an empty list if there is no more data to load.
Pass the key for the subsequent page to load to adjacentPageKey. For example, if you've loaded a page in loadBefore, pass the key for the previous page, or null if the loaded page is the first. If in loadAfter, pass the key for the next page, or null if the loaded page is the last.
| Parameters | |
|---|---|
data: List<Value> |
List of items loaded from the PageKeyedDataSource. |
adjacentPageKey: Key? |
Key for subsequent page load (previous page in |