234 lines
8.8 KiB
HTML
234 lines
8.8 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>
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Android Design - Progress and Activity
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</title>
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<link rel="shortcut icon" type="image/x-icon" href="/favicon.ico">
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<link rel="stylesheet" href="../static/yui-3.3.0-reset-min.css">
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</head>
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<body>
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<div id="page-container">
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<div id="page-header"><a href="../index.html">Android Design</a></div>
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<li class="nav-section">
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<div class="nav-section-header"><a href="../index.html">Get Started</a></div>
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<ul>
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<li><a href="../get-started/creative-vision.html">Creative Vision</a></li>
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<li><a href="../get-started/principles.html">Design Principles</a></li>
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<li><a href="../get-started/ui-overview.html">UI Overview</a></li>
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<div class="nav-section-header"><a href="../style/index.html">Style</a></div>
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<ul>
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<li><a href="../style/devices-displays.html">Devices and Displays</a></li>
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<li><a href="../style/themes.html">Themes</a></li>
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<li><a href="../style/touch-feedback.html">Touch Feedback</a></li>
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<li><a href="../style/metrics-grids.html">Metrics and Grids</a></li>
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<li><a href="../style/typography.html">Typography</a></li>
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<li><a href="../style/color.html">Color</a></li>
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<li class="nav-section">
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<div class="nav-section-header"><a href="../patterns/index.html">Patterns</a></div>
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<ul>
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<li><a href="../patterns/new-4-0.html">New in Android 4.0</a></li>
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<li><a href="../patterns/gestures.html">Gestures</a></li>
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<li><a href="../patterns/app-structure.html">App Structure</a></li>
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<li><a href="../patterns/swipe-views.html">Swipe Views</a></li>
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<li><a href="../patterns/compatibility.html">Compatibility</a></li>
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<div class="nav-section-header"><a href="../building-blocks/index.html">Building Blocks</a></div>
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<li><a href="../building-blocks/grid-lists.html">Grid Lists</a></li>
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<li><a href="../building-blocks/scrolling.html">Scrolling</a></li>
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<li><a href="../building-blocks/spinners.html">Spinners</a></li>
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<li><a href="../building-blocks/buttons.html">Buttons</a></li>
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<li><a href="../building-blocks/text-fields.html">Text Fields</a></li>
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<li><a href="../building-blocks/seek-bars.html">Seek Bars</a></li>
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<li><a href="../building-blocks/progress.html">Progress & Activity</a></li>
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<div id="back-dac-section"><a href="../../index.html" target="_blank">Developers</a></div>
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</ul>
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<div id="content">
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<div class="layout-content-row content-header">
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<div class="layout-content-col span-9">
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<h2 id="system">Feedback</h2>
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</div>
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<a href="#" class="prev-page-link">Previous</a>
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</div>
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<p>When an operation of interest to the user is taking place over a relatively long period of time,
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provide visual feedback that it's still happening and in the process of being completed.</p>
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<h2>Progress</h2>
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<p>If you know the percentage of the operation that has been completed, use a determinate progress bar
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to give the user a sense of how much longer it will take.</p>
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<img src="../static/content/progress_download.png">
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<p>The progress bar should always travel from 0% to 100% completion. Avoid setting the bar to a lower
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value than a previous value, or using the same progress bar to represent the progress of multiple
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events, since doing so makes the display meaningless. If you're not sure how long a particular
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operation will take, use an indeterminate progress indicator.</p>
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<div class="vspace size-2"> </div>
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<img src="../static/content/progress_themes.png">
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<div class="figure-caption">
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Progress bar in Holo Dark and Holo Light.
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</div>
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<h2 id="activity">Activity</h2>
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<p>If you don't know how much longer an operation will continue, use an indeterminate progress
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indicator. There are two styles available: a flat bar and a circle. Use the one that best fits the
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available space.</p>
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<div class="layout-content-row">
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<div class="layout-content-col span-6">
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<img src="../static/content/progress_activity.png">
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</div>
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<div class="layout-content-col span-7 with-callouts">
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<ol>
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<li class="value-1"><h4>Activity bar (shown with the Holo Dark theme)</h4>
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<p>
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An indeterminate activity bar is used at the start of an application download because Market hasn't
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been able to contact the server yet, and it's not possible to determine how long it will take for
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the download to begin.
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</p>
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</li>
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</ol>
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</div>
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</div>
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<div class="layout-content-row">
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<div class="layout-content-col span-6">
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<img src="../static/content/progress_activity2.png">
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</div>
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<div class="layout-content-col span-7 with-callouts">
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<ol>
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<li class="value-2"><h4>Activity circle (shown with the Holo Light theme)</h4>
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<p>
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An indeterminate activity circle is used in the Gmail application when a message is being
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loaded because it's not possible to determine how long it will take to download the email.
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</p>
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</li>
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</ol>
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</div>
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</div>
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<p>You should only use one activity indicator on screen per activity, and it should appropriately sized
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for the surrounding context. For example, the largest activity circle works well when displayed in a
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blank content area, but not in a smaller dialog box.</p>
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<div class="layout-content-row content-footer">
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<div class="paging-links layout-content-col span-9"> </div>
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<a href="#" class="prev-page-link">Previous</a>
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</div>
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</div>
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<div id="page-footer">
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<p id="copyright">
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Except as noted, this content is licensed under
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<a href="http://creativecommons.org/licenses/by/2.5/" target="_blank">
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Creative Commons Attribution 2.5</a>.<br>
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For details and restrictions, see the
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<a href="http://developer.android.com/license.html" target="_blank">Content License</a>.
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</p>
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<p>
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<a href="http://www.android.com/terms.html" target="_blank">Site Terms of Service</a> –
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