33 lines
2.0 KiB
Plaintext
33 lines
2.0 KiB
Plaintext
page.title=Near Field Communication
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@jd:body
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<p>Near Field Communication (NFC) is a set of short-range wireless technologies, typically
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requiring a distance of 4cm or less to initiate a connection. NFC allows you to share small
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payloads of data between an NFC tag and an Android-powered device, or between two Android-powered
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devices.
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<p>Tags can range in complexity. Simple tags offer just read and write semantics, sometimes with
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one-time-programmable areas to make the card read-only. More complex tags offer math operations,
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and have cryptographic hardware to authenticate access to a sector. The most sophisticated tags
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contain operating environments, allowing complex interactions with code executing on the tag.
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The data stored in the tag can also be written in a variety of formats, but many of the Android
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framework APIs are based around a <a href="http://www.nfc-forum.org/">NFC Forum</a> standard
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called NDEF (NFC Data Exchange Format).</p>
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<dl>
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<dt><strong><a href="{@docRoot}guide/topics/nfc/nfc.html">NFC Basics</a></strong></dt>
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<dd>This document describes how Android handles discovered NFC tags and how it notifies
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applications of data that is relevant to the application. It also goes over how to work with the
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NDEF data in your applications and gives an overview of the framework APIs that support the basic
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NFC feature set of Android.</dd>
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<dt><strong><a href="{@docRoot}guide/topics/nfc/advanced-nfc.html">Advanced
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NFC</a></strong></dt>
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<dd>This document goes over the APIs that enable use of the various tag technologies that
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Android supports. When you are not working with NDEF data, or when you are working with NDEF
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data that Android cannot fully understand, you have to manually read or write to the tag in raw
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bytes using your own protocol stack. In these cases, Android provides support to detect
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certain tag technologies and to open communication with the tag using your own protocol
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stack.</dd>
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</dl>
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</p> |