android NFC 读卡

android NFC

Android NFC（Near Field Communication）技术是一种短距离无线通信技术，常用于移动设备之间的数据交换、支付、信息读取等场景。在Android系统中，开发者可以通过API接口实现对NFC功能的控制，包括读取和写入支持NFC的卡片。本篇文章将详细探讨如何在Android平台上实现NFC读卡功能，尤其是针对MifareClassic类型的卡片。 1. **理解NFC基础** - NFC是一种基于RFID（Radio Frequency Identification）技术的短距离无线通信标准，工作在13.56MHz频率下，有效距离一般在10厘米以内。 - NFC支持三种模式：读/写模式、点对点模式和卡片模拟模式。在读/写模式下，设备可以读取或写入NFC标签的数据。 2. **MifareClassic卡片介绍** - MifareClassic是NXP Semiconductors推出的一种非接触式IC卡，常用于门禁、公交卡等领域。它分为不同的容量版本（4K、1K、Ultralight），并分有16个扇区，每个扇区包含4块，每块16字节。 3. **Android NFC API** - Android提供`android.nfc`包来处理NFC相关的操作，其中核心类包括`NfcAdapter`、`Tag`和`Ndef`。 - `NfcAdapter`是系统提供的NFC适配器，通过`getDefaultAdapter(Context)`获取，用于开启/关闭NFC、设置监听器等操作。 - `Tag`对象表示与设备交互的实体，通过`NfcAdapter.getTechList(Tag)`可以获取卡片支持的技术，如MifareClassic。 4. **读取MifareClassic卡片** - 创建一个`NfcAdapter.OnTagDiscoveredListener`，当检测到新的NFC标签时，会调用`onTagDiscovered(Tag tag)`方法。 - 检查`tag`是否支持MifareClassic，通过`tag.getTechList().contains(MifareClassic.class.getName())`判断。 - 连接至MifareClassic卡片，`MifareClassic card = MifareClassic.get(tag);` - 分区读取：MifareClassic卡片的每个扇区都有一个独立的密钥，需要先验证密钥才能读取。通常有A和B两组密钥，使用`connect()`连接卡片，然后`authenticate(int sector, byte[] key)`进行认证，成功后可以使用`readBlock(int blockNumber)`读取指定块的数据。 5. **处理安全问题** - 访问MifareClassic卡片时，需要处理安全问题，比如防止非法访问、密钥管理等。确保在应用中正确存储和使用密钥。 - 对于敏感信息，考虑使用加密技术，提高数据安全性。 6. **权限配置** - 在AndroidManifest.xml中添加NFC权限： ```xml ``` - 如果需要在后台读取NFC标签，还需申请`android.hardware.nfc.hce`权限。 7. **实际应用示例** - 可以参考TestNFC项目中的代码实现，该项目可能包含了一个简单的Android应用，演示了如何读取MifareClassic卡片的扇区数据。通过以上步骤，你可以在Android设备上实现MifareClassic卡片的读取。不过，实际开发过程中还需要考虑错误处理、用户交互、卡片兼容性等问题，以确保应用的稳定性和用户体验。在不断迭代和优化中，你的NFC应用将更加完善。

文件下载

资源详情

[{"title":"（ 45 个子文件 952KB ） android NFC 读卡","children":[{"title":"TestNFC","children":[{"title":"bin","children":[{"title":"classes.dex 437.80KB ","children":null,"spread":false},{"title":"res","children":[{"title":"crunch","children":[{"title":"drawable-ldpi","children":[{"title":"ic_launcher.png 2.12KB ","children":null,"spread":false}],"spread":true},{"title":"drawable-hdpi","children":[{"title":"ic_launcher.png 6.15KB ","children":null,"spread":false}],"spread":true},{"title":"drawable-xhdpi","children":[{"title":"ic_launcher.png 9.85KB ","children":null,"spread":false}],"spread":true},{"title":"drawable-mdpi","children":[{"title":"ic_launcher.png 3.22KB ","children":null,"spread":false}],"spread":true}],"spread":true}],"spread":true},{"title":"TestNFC.apk 180.11KB ","children":null,"spread":false},{"title":"dexedLibs","children":[{"title":"android-support-v4-a6a266b7e001c3315ef9d3a72459001a.jar 148.43KB ","children":null,"spread":false}],"spread":true},{"title":"classes","children":[{"title":"com","children":[{"title":"sy","children":[{"title":"nfc","children":[{"title":"test","children":[{"title":"MainActivity.class 7.35KB ","children":null,"spread":false},{"title":"BuildConfig.class 339B ","children":null,"spread":false},{"title":"R$layout.class 385B ","children":null,"spread":false},{"title":"R$id.class 445B ","children":null,"spread":false},{"title":"R$drawable.class 398B ","children":null,"spread":false},{"title":"R$dimen.class 387B ","children":null,"spread":false},{"title":"R$attr.class 331B ","children":null,"spread":false},{"title":"R$menu.class 383B ","children":null,"spread":false},{"title":"R.class 684B ","children":null,"spread":false},{"title":"R$string.class 617B ","children":null,"spread":false},{"title":"R$xml.class 387B ","children":null,"spread":false},{"title":"R$style.class 422B ","children":null,"spread":false}],"spread":false}],"spread":true}],"spread":true}],"spread":true}],"spread":true},{"title":"resources.ap_ 27.50KB ","children":null,"spread":false},{"title":"AndroidManifest.xml 1.30KB ","children":null,"spread":false}],"spread":true},{"title":"res","children":[{"title":"drawable-ldpi","children":[{"title":"ic_launcher.png 2.50KB ","children":null,"spread":false}],"spread":true},{"title":"values-v11","children":[{"title":"styles.xml 323B ","children":null,"spread":false}],"spread":true},{"title":"menu","children":[{"title":"read_tag.xml 249B ","children":null,"spread":false}],"spread":true},{"title":"values-v14","children":[{"title":"styles.xml 380B ","children":null,"spread":false}],"spread":true},{"title":"drawable-hdpi","children":[{"title":"ic_launcher.png 8.02KB ","children":null,"spread":false}],"spread":true},{"title":"drawable-xhdpi","children":[{"title":"ic_launcher.png 13.25KB ","children":null,"spread":false}],"spread":true},{"title":"values","children":[{"title":"strings.xml 522B ","children":null,"spread":false},{"title":"styles.xml 679B ","children":null,"spread":false},{"title":"dimens.xml 106B ","children":null,"spread":false}],"spread":true},{"title":"drawable-mdpi","children":[{"title":"ic_launcher.png 3.97KB ","children":null,"spread":false}],"spread":true},{"title":"layout","children":[{"title":"main.xml 738B ","children":null,"spread":false}],"spread":true},{"title":"xml","children":[{"title":"nfc_tech_filter.xml 214B ","children":null,"spread":false}],"spread":true}],"spread":true},{"title":"proguard-project.txt 781B ","children":null,"spread":false},{"title":"ic_launcher-web.png 54.44KB ","children":null,"spread":false},{"title":"assets","children":null,"spread":false},{"title":"gen","children":[{"title":"com","children":[{"title":"sy","children":[{"title":"nfc","children":[{"title":"test","children":[{"title":"BuildConfig.java 157B ","children":null,"spread":false},{"title":"R.java 2.55KB ","children":null,"spread":false}],"spread":true}],"spread":true}],"spread":true}],"spread":true}],"spread":true},{"title":".settings","children":[{"title":"org.eclipse.core.resources.prefs 57B ","children":null,"spread":false},{"title":"org.eclipse.jdt.core.prefs 177B ","children":null,"spread":false}],"spread":true},{"title":"src","children":[{"title":"com","children":[{"title":"sy","children":[{"title":"nfc","children":[{"title":"test","children":[{"title":"MainActivity.java 6.17KB ","children":null,"spread":false}],"spread":true}],"spread":true}],"spread":true}],"spread":true}],"spread":true},{"title":".project 810B ","children":null,"spread":false},{"title":".classpath 475B ","children":null,"spread":false},{"title":"project.properties 563B ","children":null,"spread":false},{"title":"AndroidManifest.xml 1.30KB ","children":null,"spread":false},{"title":"libs","children":[{"title":"android-support-v4.jar 376.65KB ","children":null,"spread":false}],"spread":true}],"spread":false}],"spread":true}]

评论信息

其他资源

免责申明

【只为小站】的资源来自网友分享，仅供学习研究，请务必在下载后24小时内给予删除，不得用于其他任何用途，否则后果自负。基于互联网的特殊性，【只为小站】无法对用户传输的作品、信息、内容的权属或合法性、合规性、真实性、科学性、完整权、有效性等进行实质审查；无论【只为小站】经营者是否已进行审查，用户均应自行承担因其传输的作品、信息、内容而可能或已经产生的侵权或权属纠纷等法律责任。
本站所有资源不代表本站的观点或立场，基于网友分享，根据中国法律《信息网络传播权保护条例》第二十二条之规定，若资源存在侵权或相关问题请联系本站客服人员，zhiweidada#qq.com，请把#换成@，本站将给予最大的支持与配合，做到及时反馈和处理。关于更多版权及免责申明参见版权及免责申明

android NFC 读卡

文件下载

资源详情

评论信息

其他资源

免责申明

个人信息

相关资源标签

热门下载

最新下载