Android NFC架构分析

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Android NFC架构分析

作者:时间:2018-09-10来源:网络收藏

中对的实现代码分布在如下几个地方:

本文引用地址:/article/201809/388756.htm

./frameworks/base/core/java/android/nfc/

./frameworks/base/core/java/android/nfc/tech

./frameworks/base/core/java/com/android/internal/nfc/

./external/libnfc-nxp

./packages/apps/nfc

其中

./external/libnfc-nxp是用C语言编写的函数库,编译生成libnfc和libnfc_ndef两个函数库。libnfc是一个主要的库,实现了 Stack的大部分功能,主要供的服务进程调用。

libnfc_ndef是一个很小的函数库,主要是实现NDEF消息的解析,供Framework调用。

./packages/apps/nfc是一个类似于电话本的应用程序,但这个程序在手机开机后自动启动,一直运行,是作为NFC的服务进程存在的。是NFC中的核心。

./frameworks/base/core/java/android/nfc/,./frameworks/base/core/java/android/nfc/tech和./frameworks/base/core/java/com/android/internal/nfc/这三个目录

实现了NFC的应用接口,其中./frameworks/base/core/java/com/android/internal/nfc/是一些内部类或结构,不对外开放,仅供./frameworks/base/core/java/android/nfc/和

./frameworks/base/core/java/android/nfc/tech中的类调用。

./frameworks/base/core/java/android/nfc实现了接口包com.android.nfc,./frameworks/base/core/java/android/nfc/tech实现了接口包com.android.nfc.tech.

图示如下:

附录:

NFC Service的说明

NFC: Move NFC service implementation out of system_server.

NFC service is now an application service in packages/apps/Nfc.

NFC service is registered through ServiceManager.addService(), and the proxy object NfcAdapter obtains a handle to it through

ServiceManager.getService().

**Important** Had to add new symbols AID_NFC / NFC_UID / android.uid.nfc and modify service_manager.c, Process.java and PackageManagerService.java

in order to force the com.android.nfc process to take a fixed uid, so that it can use ServiceManager.addService().

Most of the JNI has moved to packages/apps/Nfc/jni. However NdefRecord and NdefMessage require some in-process native code, so

android_com_NdefMessage.cpp and android_com_NdefRecord.cpp stay in frameworks/base/core/jni. They link to a very small library libnfc_ndef.so

that implements NDEF message parsing. This has been added to core.mk so all devices (even without NFC hardware) can work with NDEF data.



关键词: Android NFC 架构 分析

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