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| <title>ItemKeyedDataSource.LoadCallback</title> |
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| <h1>ItemKeyedDataSource.LoadCallback</h1> |
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| <p> |
| <pre>public abstract class ItemKeyedDataSource.LoadCallback<Value extends <a href="/reference/java/lang/Object.html">Object</a>></pre> |
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| <div class="devsite-table-wrapper"><devsite-expandable><span class="expand-control jd-sumtable-subclasses">Known direct subclasses |
| <div class="showalways" id="subclasses-direct"><a href="/reference/androidx/paging/ItemKeyedDataSource.LoadInitialCallback.html">ItemKeyedDataSource.LoadInitialCallback</a></div> |
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| <td><code><a href="/reference/androidx/paging/ItemKeyedDataSource.LoadInitialCallback.html">ItemKeyedDataSource.LoadInitialCallback</a></code></td> |
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| <p>Callback for <code><a href="/reference/androidx/paging/ItemKeyedDataSource.html#loadInitial(androidx.paging.ItemKeyedDataSource.LoadInitialParams)">loadInitial</a></code> to return data and, optionally, position/count information.</p> |
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| <p>Callback for ItemKeyedDataSource <code><a href="/reference/androidx/paging/ItemKeyedDataSource.html#loadBefore(androidx.paging.ItemKeyedDataSource.LoadParams)">loadBefore</a></code> and <code><a href="/reference/androidx/paging/ItemKeyedDataSource.html#loadAfter(androidx.paging.ItemKeyedDataSource.LoadParams)">loadAfter</a></code> to return data.</p> |
| <p>A callback can be called only once, and will throw if called again.</p> |
| <p>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).</p> |
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| <th colspan="2">Parameters</th> |
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| <td><code><Value extends <a href="/reference/java/lang/Object.html">Object</a>></code></td> |
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| <p>Type of items being loaded.</p> |
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| <h2>Summary</h2> |
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| <th colspan="2"><h3>Public constructors</h3></th> |
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| <div><code><Value extends <a href="/reference/java/lang/Object.html">Object</a>> <a href="/reference/androidx/paging/ItemKeyedDataSource.LoadCallback.html#LoadCallback()">LoadCallback</a>()</code></div> |
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| <td><code>abstract void</code></td> |
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| <div><code><a href="/reference/androidx/paging/ItemKeyedDataSource.LoadCallback.html#onResult(kotlin.collections.List)">onResult</a>(<a href="/reference/java/util/List.html">List</a><Value> data)</code></div> |
| <p>Called to pass loaded data from a DataSource.</p> |
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| <h2>Public constructors</h2> |
| <div><a name="LoadCallback--"></a> |
| <h3 class="api-name" id="LoadCallback()">LoadCallback</h3> |
| <pre class="api-signature no-pretty-print">public final <Value extends <a href="/reference/java/lang/Object.html">Object</a>> <a href="/reference/androidx/paging/ItemKeyedDataSource.LoadCallback.html#LoadCallback()">LoadCallback</a>()</pre> |
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| <td><code><Value extends <a href="/reference/java/lang/Object.html">Object</a>></code></td> |
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| <p>Type of items being loaded.</p> |
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| <h2>Public methods</h2> |
| <div><a name="onResult-kotlin.collections.List-"></a> |
| <h3 class="api-name" id="onResult(kotlin.collections.List)">onResult</h3> |
| <pre class="api-signature no-pretty-print">public abstract void <a href="/reference/androidx/paging/ItemKeyedDataSource.LoadCallback.html#onResult(kotlin.collections.List)">onResult</a>(<a href="/reference/java/util/List.html">List</a><Value> data)</pre> |
| <p>Called to pass loaded data from a DataSource.</p> |
| <p>Call this method from your ItemKeyedDataSource's <code><a href="/reference/androidx/paging/ItemKeyedDataSource.html#loadBefore(androidx.paging.ItemKeyedDataSource.LoadParams)">loadBefore</a></code> and <code><a href="/reference/androidx/paging/ItemKeyedDataSource.html#loadAfter(androidx.paging.ItemKeyedDataSource.LoadParams)">loadAfter</a></code> methods to return data.</p> |
| <p>Call this from <code><a href="/reference/androidx/paging/ItemKeyedDataSource.html#loadInitial(androidx.paging.ItemKeyedDataSource.LoadInitialParams)">loadInitial</a></code> to initialize without counting available data, or supporting placeholders.</p> |
| <p>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.</p> |
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| <td><code><a href="/reference/java/util/List.html">List</a><Value> data</code></td> |
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| <p>List of items loaded from the <code><a href="/reference/androidx/paging/ItemKeyedDataSource.html">ItemKeyedDataSource</a></code>.</p> |
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