5cdadb48d0
* revise to the Compatibility doc, put it in Intro * put Permissions in Intro * put App Fundamentals in Intro * move Manifest docs to the top of side nav tree * move App Resources above UI Will perform another fix to the Best Practices section later to deprecate some docs there and point to Training instead Change-Id: I88a8f94167ba15e97eb3bbbc08fd82dd82498e4b
76 lines
2.8 KiB
Plaintext
76 lines
2.8 KiB
Plaintext
page.title=Introduction to Android
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@jd:body
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<div class="sidebox" style="width:220px"><!-- width to match col-4 below -->
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<p>To learn how apps work, start with
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<a href="{@docRoot}guide/components/fundamentals.html">App Fundamentals</a>.</p>
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<p>To begin coding right away, read <a
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href="{@docRoot}training/basics/firstapp/index.html">Building Your First App</a>.</p>
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</div>
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<p>Android provides a rich application framework that allows you to build innovative apps and games
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for mobile devices in a Java language environment. The documents listed in the left
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navigation provide details about how to build apps using Android's various APIs.</p>
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<p>If you're new to Android development, it's important that you understand
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the following fundamental concepts about the Android app framework:</p>
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<div class="landing-banner">
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<div class="col-6">
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<h4>Apps provide multiple entry points</h4>
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<p>Android apps are built as a combination of distinct components that can be invoked
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individually. For instance, an individual <em>activity</em> provides a single
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screen for a user interface, and a <em>service</em> independently performs
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work in the background.</p>
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<p>From one component you can start another component using an <em>intent</em>. You can even start
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a component in a different app, such an activity in a maps app to show an address. This model
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provides multiple entry points for a single app and allows any app to behave as a user's "default"
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for an action that other apps may invoke.</p>
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<p><b>Learn more:</b></p>
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<ul class="nolist">
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<li><a href="{@docRoot}guide/components/fundamentals.html">App Fundamentals</a>
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<li><a href="{@docRoot}guide/components/intents-filters.html">Intents and Intent Filters</a>
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<li><a href="{@docRoot}guide/components/activities.html">Activities</a>
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</ul>
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</div>
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<div class="col-6">
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<h4>Apps adapt to different devices</h4>
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<p>Android provides an adaptive app framework that allows you to provide unique resources
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for different device configurations. For example, you can create different XML
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layout files for different screen sizes and the system
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determines which layout to apply based on the current device's screen size.</p>
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<p>You can query the availability of device features at runtime if any app features require
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specific hardware such as a camera. If necessary, you can also declare features your app requires
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so app markets such as Google Play Store do not allow installation on devices that do not support
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that feature.</p>
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<p><b>Learn more:</b></p>
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<ul class="nolist">
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<li><a href="{@docRoot}guide/practices/compatibility.html">Device Compatibility</a>
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<li><a href="{@docRoot}guide/topics/resources/overview.html">Resources Overview</a>
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<li><a href="{@docRoot}guide/topics/ui/overview.html">User Interface Overview</a>
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</ul>
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</div>
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</div><!-- end landing-banner -->
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