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303 lines
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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Android Design - UI Overview
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<div id="page-header"><a href="../index.html">Android Design</a></div>
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<div class="nav-section-header"><a href="../index.html">Get Started</a></div>
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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="../patterns/index.html">Patterns</a></div>
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<li><a href="../patterns/swipe-views.html">Swipe Views</a></li>
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<li><a href="../patterns/selection.html">Selection</a></li>
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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>UI Overview</h2>
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</div>
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<div class="paging-links layout-content-col span-4">
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<a href="#" class="prev-page-link">Previous</a>
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</div>
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<p>Android's system UI provides the framework on top of which you build your app. Important aspects
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include the Home screen experience, global device navigation, and notifications.</p>
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<p>Your app will play an important part in keeping the overall Android experience consistent and
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enjoyable to use. At the end of this chapter we introduce the main elements for achieving this goal
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in your app.</p>
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<p>Read on for a quick overview of the most important aspects of the Android user interface.</p>
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<h2>Home, All Apps, and Recents</h2>
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<div class="vspace size-1"> </div>
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<div class="layout-content-row">
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<div class="layout-content-col span-4">
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<img src="../static/content/ui_overview_home_screen.png">
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<h4>Home screen</h4>
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<p>Home is a customizable space that houses app shortcuts, folders and widgets. Navigate between
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different home screen panels by swiping left and right.</p>
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<p>The Favorites Tray at the bottom always keeps your most important shortcuts and folders in view
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regardless of which panel is currently showing.</p>
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<p>Access the entire collection of apps and widgets by touching the All Apps button at the center of
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the Favorites Tray.</p>
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</div>
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<div class="layout-content-col span-4">
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<img src="../static/content/ui_overview_all_apps.png">
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<h4>All apps screen</h4>
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<p>The All Apps screen lets you browse the entire set of apps and widgets that are installed on your
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device.</p>
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<p>Users can drag an app or widget icon from the All Apps screen and place it in any empty location on
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any Home screen.</p>
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</div>
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<div class="layout-content-col span-4">
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<img src="../static/content/ui_overview_recents.png">
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<h4>Recents screen</h4>
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<p>Recents provides an efficient way of switching between recently used applications. It provides a
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clear navigation path between multiple ongoing tasks.</p>
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<p>The Recents button at the right side of the navigation bar displays the apps that the user has
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interacted with most recently. They are organized in reverse chronological order with the most
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recently used app at the bottom.</p>
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<p>Switch to an app by touching it. Remove an item by swiping left or right.</p>
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</div>
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</div>
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<h2>System Bars</h2>
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<p>The system bars are screen areas dedicated to the display of notifications, communication of device
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status, and device navigation. Typically the system bars are displayed concurrently with your app.
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Apps that display immersive content, such as movies or images, can temporarily hide the system bars
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to allow the user to enjoy full screen content without distraction.</p>
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<img src="../static/content/ui_overview_system_ui.png">
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<div class="with-callouts">
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<ol>
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<li>
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<h4>Status Bar</h4>
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<p>Displays pending notifications on the left and status, such as time, battery level, or signal
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strength, on the right. Swipe down from the status bar to show notification details.</p>
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</li>
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<li>
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<h4>Navigation Bar</h4>
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<p>New for phones in Android 4.0, the navigation bar is present only on devices that don't have
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the traditional hardware keys. It houses the device navigation controls Back, Home, and
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Recents, and also displays a menu for apps written for Android 2.3 or earlier.</p>
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</li>
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<li>
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<h4>Combined Bar</h4>
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<p>On tablet form factors the status and navigation bars are combined into a single bar at the
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bottom of the screen.</p>
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</li>
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</ol>
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</div>
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<h2>Notifications</h2>
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<p>Notifications are brief messages that users can access at any time from the status bar. They
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provide updates, reminders, or information that's important, but not critical enough to warrant
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interrupting the user. Open the notifications drawer by swiping down on the status bar. Touching a
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notification opens the associated app. <a href="../patterns/notifications.html">More on Notifications</a></p>
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<div class="layout-content-row">
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<div class="layout-content-col span-4">
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<img src="../static/content/ui_overview_notifications.png">
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</div>
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<div class="layout-content-col span-9">
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<img src="../static/content/notifications_dismiss.png">
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<p>Most notifications have a one-line title and a one-line message. The recommended layout for a
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notification includes two lines. If necessary, you can add a third line. Timestamps are optional.</p>
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<p>Swiping a notification right or left removes it from the notification drawer.</p>
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</div>
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</div>
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<h2 id="app">Common App UI</h2>
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<div class="layout-content-row">
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<div class="layout-content-col span-7">
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<img src="../static/content/ui_overview_app_ui.png">
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</div>
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<div class="layout-content-col span-6 with-callouts">
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<p>A typical Android app consists of action bars and the app content area.</p>
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<ol>
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<li>
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<h4>Main Action Bar</h4>
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<p>The command and control center for your app. The main action bar includes elements for
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navigating your app's hierarchy and views, and also surfaces the most important actions.</p>
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<p><a href="../patterns/actionbar.html">More on the Action Bar</a></p>
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</li>
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<li>
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<h4>View Control</h4>
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<p>Allows users to switch between the different views that your app provides. Views typically
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consist of different arrangements of your data or different functional aspects of your app.</p>
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</li>
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<li>
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<h4>Content Area</h4>
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<p>The space where the content of your app is displayed.</p>
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</li>
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<li>
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<h4>Split Action Bar</h4>
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<p>Split action bars provide a way to distribute actions across additional bars located below
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the main action bar or at the bottom of the screen. In this example, a split action bar moves
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important actions that won't fit in the main bar to the bottom.</p>
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</li>
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</ol>
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</div>
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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">Content License</a>.
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