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| <h2>Selection</h2> |
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| <p>Android 3.0 introduced the <em>long press</em> gesture—that is, a touch that's held in the same |
| position for a moment—as the global gesture to select data. This affects the way you should |
| handle multi-select and contextual actions in your apps.</p> |
| |
| <div class="vspace size-1"> </div> |
| |
| <div class="layout-content-row"> |
| <div class="layout-content-col span-6"> |
| |
| <h4>What has changed?</h4> |
| <p>In previous versions of Android, the long press gesture was universally used to display contextual |
| actions for a given data item in a contextual menu.</p> |
| <p>This pattern changed with Android 3.0. The long press gesture is now used to select data, combining |
| contextual actions and selection management functions for selected data into a new element called |
| the contextual action bar (CAB).</p> |
| |
| </div> |
| <div class="layout-content-col span-7"> |
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| <img src="../static/content/selection_context_menu.png"> |
| <div class="figure-caption"> |
| Traditional use of the long press gesture to show contextual menus. |
| </div> |
| |
| </div> |
| </div> |
| |
| <h4>Using the contextual action bar (CAB)</h4> |
| <p>The selection CAB is a temporary action bar that overlays your app's current action bar while data |
| is selected. It appears after the user long presses on a selectable data item.</p> |
| |
| <img src="../static/content/selection_cab_big.png"> |
| |
| <div class="vspace size-1"> </div> |
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| <div class="layout-content-row"> |
| <div class="layout-content-col span-6"> |
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| <p>From here the user can:</p> |
| <ul> |
| <li>Select additional data items by touching them.</li> |
| <li>Trigger an action from the CAB that applies to all highlighted data items. The CAB then |
| automatically dismisses itself.</li> |
| <li>Dismiss the CAB via the navigation bar's Back button or the CAB's checkmark button. This removes |
| the CAB along with all selection highlights.</li> |
| </ul> |
| |
| </div> |
| <div class="layout-content-col span-7"> |
| |
| <img src="../static/content/selection_cab_example.png"> |
| |
| </div> |
| </div> |
| |
| <div class="layout-content-row"> |
| <div class="layout-content-col span-6"> |
| |
| <h4>Selecting CAB actions</h4> |
| <p>You can decide which actions and elements appear in the CAB. Use the guidelines in the <a href="actionbar.html">Action Bar |
| pattern</a> to decide which items to surface at the top level and which to move to the |
| action overflow.</p> |
| <h4>Dynamically adjust CAB actions</h4> |
| <p>In most cases you need to adjust the actions in the CAB dynamically as the user adds more items to |
| the selection. Actions that apply to a single selected data item don't necessarily apply to multiple |
| selected data items of the same kind.</p> |
| |
| </div> |
| <div class="layout-content-col span-7"> |
| |
| <img src="../static/content/selection_adjusting_actions.png"> |
| <div class="figure-caption"> |
| Adjusting actions in the CAB as additional items are selected. |
| </div> |
| |
| </div> |
| </div> |
| |
| <h2 id="checklist">Checklist</h2> |
| |
| <ul> |
| <li> |
| <p>Whenever your app supports the selection of multiple data items, make use of the contextual action |
| bar (CAB).</p> |
| </li> |
| <li> |
| <p>Reserve the long press gesture for selection exclusively. Don't use it to display traditional |
| contextual menus.</p> |
| </li> |
| <li> |
| <p>If you don't support multi-selection within a list, long press should do nothing.</p> |
| </li> |
| <li> |
| <p>Plan the actions you want to display inside of a CAB in the same way you would plan the actions |
| inside your app's action bar.</p> |
| </li> |
| </ul> |
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