| <html devsite="true"> |
| <head> |
| <title>PagingData</title> |
| {% setvar book_path %}/reference/androidx/_book.yaml{% endsetvar %} |
| {% include "_shared/_reference-head-tags.html" %} |
| </head> |
| <body> |
| <h1>PagingData</h1> |
| {% setvar page_path %}androidx/paging/PagingData.html{% endsetvar %} |
| {% setvar can_switch %}1{% endsetvar %} |
| {% include "reference/_java_switcher2.md" %} |
| <p> |
| <pre>public final class PagingData<T extends <a href="/reference/java/lang/Object.html">Object</a>></pre> |
| </p> |
| <hr> |
| <p>Container for Paged data from a single generation of loads.</p> |
| <p>Each refresh of data (generally either pushed by local storage, or pulled from the network) will have a separate corresponding <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code>.</p> |
| <h2>Summary</h2> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2"><h3>Nested types</h3></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/androidx/paging/PagingData.Companion.html">PagingData.Companion</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2"><h3>Public methods</h3></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>final <a href="/reference/androidx/paging/PagingData.html">PagingData</a><T></code></td> |
| <td width="100%"> |
| <div><code><a href="/reference/androidx/paging/PagingData.html#filter(kotlin.Function1)">filter</a>(<a href="/reference/kotlin/jvm/functions/Function1.html">Function1</a><T, <a href="/reference/java/lang/Boolean.html">Boolean</a>> predicate)</code></div> |
| <p>Returns a <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code> containing only elements matching the given <code><a href="/reference/androidx/paging/PagingData.html#predicate()">predicate</a></code></p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>final <a href="/reference/androidx/paging/PagingData.html">PagingData</a><R></code></td> |
| <td width="100%"> |
| <div><code><R extends <a href="/reference/java/lang/Object.html">Object</a>> <a href="/reference/androidx/paging/PagingData.html#flatMap(kotlin.Function1)">flatMap</a>(<a href="/reference/kotlin/jvm/functions/Function1.html">Function1</a><T, <a href="/reference/java/lang/Iterable.html">Iterable</a><R>> transform)</code></div> |
| <p>Returns a <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code> of all elements returned from applying the given <code><a href="/reference/androidx/paging/PagingData.html#transform()">transform</a></code> to each element, as it is loaded.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>final <a href="/reference/androidx/paging/PagingData.html">PagingData</a><T></code></td> |
| <td width="100%"> |
| <div><code><a href="/reference/androidx/paging/PagingData.html#insertFooterItem(kotlin.Any)">insertFooterItem</a>(T item)</code></div> |
| <p>Returns a <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code> containing each original element, with the passed footer <code><a href="/reference/androidx/paging/PagingData.html#item()">item</a></code> added to the end of the list.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>final <a href="/reference/androidx/paging/PagingData.html">PagingData</a><T></code></td> |
| <td width="100%"> |
| <div><code><a href="/reference/androidx/paging/PagingData.html#insertHeaderItem(kotlin.Any)">insertHeaderItem</a>(T item)</code></div> |
| <p>Returns a <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code> containing each original element, with the passed header <code><a href="/reference/androidx/paging/PagingData.html#item()">item</a></code> added to the start of the list.</p> |
| </td> |
| </tr> |
| <tr> |
| <td><code>final <a href="/reference/androidx/paging/PagingData.html">PagingData</a><R></code></td> |
| <td width="100%"> |
| <div><code><R extends <a href="/reference/java/lang/Object.html">Object</a>> <a href="/reference/androidx/paging/PagingData.html#map(kotlin.Function1)">map</a>(<a href="/reference/kotlin/jvm/functions/Function1.html">Function1</a><T, R> transform)</code></div> |
| <p>Returns a <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code> containing the result of applying the given <code><a href="/reference/androidx/paging/PagingData.html#transform()">transform</a></code> to each element, as it is loaded.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <h2>Public methods</h2> |
| <div><a name="filter-kotlin.Function1-"></a> |
| <h3 class="api-name" id="filter(kotlin.Function1)">filter</h3> |
| <pre class="api-signature no-pretty-print">@<a href="/reference/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><br>public final <a href="/reference/androidx/paging/PagingData.html">PagingData</a><T> <a href="/reference/androidx/paging/PagingData.html#filter(kotlin.Function1)">filter</a>(<a href="/reference/kotlin/jvm/functions/Function1.html">Function1</a><T, <a href="/reference/java/lang/Boolean.html">Boolean</a>> predicate)</pre> |
| <p>Returns a <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code> containing only elements matching the given <code><a href="/reference/androidx/paging/PagingData.html#predicate()">predicate</a></code></p> |
| </div> |
| <div><a name="flatMap-kotlin.Function1-"></a> |
| <h3 class="api-name" id="flatMap(kotlin.Function1)">flatMap</h3> |
| <pre class="api-signature no-pretty-print">@<a href="/reference/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><br>public final <a href="/reference/androidx/paging/PagingData.html">PagingData</a><R> <R extends <a href="/reference/java/lang/Object.html">Object</a>> <a href="/reference/androidx/paging/PagingData.html#flatMap(kotlin.Function1)">flatMap</a>(<a href="/reference/kotlin/jvm/functions/Function1.html">Function1</a><T, <a href="/reference/java/lang/Iterable.html">Iterable</a><R>> transform)</pre> |
| <p>Returns a <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code> of all elements returned from applying the given <code><a href="/reference/androidx/paging/PagingData.html#transform()">transform</a></code> to each element, as it is loaded.</p> |
| </div> |
| <div><a name="insertFooterItem-kotlin.Any-"></a> |
| <h3 class="api-name" id="insertFooterItem(kotlin.Any)">insertFooterItem</h3> |
| <pre class="api-signature no-pretty-print">@<a href="/reference/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><br>public final <a href="/reference/androidx/paging/PagingData.html">PagingData</a><T> <a href="/reference/androidx/paging/PagingData.html#insertFooterItem(kotlin.Any)">insertFooterItem</a>(T item)</pre> |
| <p>Returns a <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code> containing each original element, with the passed footer <code><a href="/reference/androidx/paging/PagingData.html#item()">item</a></code> added to the end of the list.</p> |
| <p>The footer <code><a href="/reference/androidx/paging/PagingData.html#item()">item</a></code> is added to a loaded page which marks the end of the data stream in the append direction, either by returning null in <code><a href="/reference/androidx/paging/PagingSource.LoadResult.Page.html#nextKey()">PagingSource.LoadResult.Page.nextKey</a></code>. It will be removed if the first page in the list is dropped, which can happen in the case of loaded* pages exceeding <code><a href="/reference/androidx/paging/PagedList.Config.html#maxSize()">PagedList.Config.maxSize</a></code>.</p> |
| <p>Note: This operation is not idempotent, calling it multiple times will continually add more footers to the end of the list, which can be useful if multiple footer items are required.</p> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">See also</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/androidx/paging/PagingData.html#insertHeaderItem(kotlin.Any)">insertHeaderItem</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div><a name="insertHeaderItem-kotlin.Any-"></a> |
| <h3 class="api-name" id="insertHeaderItem(kotlin.Any)">insertHeaderItem</h3> |
| <pre class="api-signature no-pretty-print">@<a href="/reference/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><br>public final <a href="/reference/androidx/paging/PagingData.html">PagingData</a><T> <a href="/reference/androidx/paging/PagingData.html#insertHeaderItem(kotlin.Any)">insertHeaderItem</a>(T item)</pre> |
| <p>Returns a <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code> containing each original element, with the passed header <code><a href="/reference/androidx/paging/PagingData.html#item()">item</a></code> added to the start of the list.</p> |
| <p>The header <code><a href="/reference/androidx/paging/PagingData.html#item()">item</a></code> is added to a loaded page which marks the end of the data stream in the prepend direction by returning null in <code><a href="/reference/androidx/paging/PagingSource.LoadResult.Page.html#prevKey()">PagingSource.LoadResult.Page.prevKey</a></code>. It will be removed if the first page in the list is dropped, which can happen in the case of loaded pages exceeding <code><a href="/reference/androidx/paging/PagedList.Config.html#maxSize()">PagedList.Config.maxSize</a></code>.</p> |
| <p>Note: This operation is not idempotent, calling it multiple times will continually add more headers to the start of the list, which can be useful if multiple header items are required.</p> |
| <div class="devsite-table-wrapper"> |
| <table class="responsive"> |
| <thead> |
| <tr> |
| <th colspan="2">See also</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code><a href="/reference/androidx/paging/PagingData.html#insertFooterItem(kotlin.Any)">insertFooterItem</a></code></td> |
| <td width="100%"></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div><a name="map-kotlin.Function1-"></a> |
| <h3 class="api-name" id="map(kotlin.Function1)">map</h3> |
| <pre class="api-signature no-pretty-print">@<a href="/reference/[JVM root]/<ERROR CLASS>.html"><ERROR CLASS></a><br>public final <a href="/reference/androidx/paging/PagingData.html">PagingData</a><R> <R extends <a href="/reference/java/lang/Object.html">Object</a>> <a href="/reference/androidx/paging/PagingData.html#map(kotlin.Function1)">map</a>(<a href="/reference/kotlin/jvm/functions/Function1.html">Function1</a><T, R> transform)</pre> |
| <p>Returns a <code><a href="/reference/androidx/paging/PagingData.html">PagingData</a></code> containing the result of applying the given <code><a href="/reference/androidx/paging/PagingData.html#transform()">transform</a></code> to each element, as it is loaded.</p> |
| </div> |
| </body> |
| </html> |
