71 lines
2.4 KiB
Plaintext
71 lines
2.4 KiB
Plaintext
page.title=Backwards Compatibility
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page.tags="support"
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page.metaDescription=Notes on how Android 4.x adapts UI designed for older hardware and OS versions.
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@jd:body
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<a class="notice-developers" href="{@docRoot}training/basics/supporting-devices/index.html">
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<div>
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<h3>Developer Docs</h3>
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<p>Supporting Different Devices</p>
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</div>
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</a>
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<p>Significant changes in Android 3.0 included:</p>
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<ul>
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<li>Deprecation of navigation hardware keys (Back, Menu, Search, Home) in favor of handling navigation
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via virtual controls (Back, Home, Recents).</li>
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<li>Robust pattern for the use of menus in action bars.</li>
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</ul>
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<p>Android 4.0 brings these changes for tablets to the phone platform.</p>
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<h2 id="older-hardware">Adapting Android 4.0 to Older Hardware and Apps</h2>
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<div class="layout-content-row">
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<div class="layout-content-col span-6">
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<h4>Phones with virtual navigation controls</h4>
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<p>Android apps written for Android 3.0 and later display actions in the action bar. Actions that don't
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fit in the action bar or aren't important enough to be displayed at the top level appear in the
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action overflow.</p>
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<p>Users access the action overflow by touching it in the action bar.</p>
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</div>
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<div class="layout-content-col span-7">
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<img src="{@docRoot}design/media/compatibility_virtual_nav.png">
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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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<h4>Phones with physical navigation keys</h4>
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<p>Android phones with traditional navigation hardware keys don't display the virtual navigation bar at
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the bottom of the screen. Instead, the action overflow is available from the menu hardware key. The
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resulting actions popup has the same style as in the previous example, but is displayed at the bottom of the screen.</p>
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</div>
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<div class="layout-content-col span-7">
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<img src="{@docRoot}design/media/compatibility_physical_buttons.png">
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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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<h4>Legacy apps on phones with virtual navigation controls</h4>
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<p>When you run an app that was built for Android 2.3 or earlier on a phone with virtual navigation
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controls, an action overflow control appears at the right side of the virtual navigation bar. You
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can touch the control to display the app's actions in the traditional Android menu styling.</p>
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</div>
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<div class="layout-content-col span-7">
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<img src="{@docRoot}design/media/compatibility_legacy_apps.png">
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</div>
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</div>
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