android实现读取nfc卡卡号示例，具体如下：
1.权限
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<uses-permission android:name="android.permission.nfc" />
<uses-feature
android:name="android.hardware.nfc"
android:required="true" />
2.注册(静态)
<intent-filter>
<action android:name="android.nfc.action.tag_discovered" />
<data android:mimetype="text/plain" />
</intent-filter>
3.activity
初始化
//初始化nfcadapter
mnfcadapter = nfcadapter.getdefaultadapter(this);
// 初始化pendingintent，当有nfc设备连接上的时候，就交给当前activity处理
pi = pendingintent.getactivity(this, 0, new intent(this, getclass())
.addflags(intent.flag_activity_single_top), 0);
启动
@override
protected void onresume() {
super.onresume();
mnfcadapter.enableforegrounddispatch(this, pi, null, null); //启动
}
获取数据
@override
protected void onnewintent(intent intent) {
super.onnewintent(intent);
// 当前app正在前端界面运行，这个时候有intent发送过来，那么系统就会调用onnewintent回调方法，将intent传送过来
// 我们只需要在这里检验这个intent是否是nfc相关的intent，如果是，就调用处理方法
if (nfcadapter.action_tag_discovered.equals(intent.getaction())) {
processintent(intent);
}
}
解析
/**
* parses the ndef message from the intent and prints to the textview
*/
private void processintent(intent intent) {
//取出封装在intent中的tag
tag tagfromintent = intent.getparcelableextra(nfcadapter.extra_tag);
string cardid =bytearraytohexstring(tagfromintent.getid());
}
private string bytearraytohexstring(byte[] inarray) {
int i, j, in;
string[] hex = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a",
"b", "c", "d", "e", "f" };
string out = "";
for (j = 0; j < inarray.length; ++j) {
in = (int) inarray[j] & 0xff;
i = (in >> 4) & 0x0f;
out += hex[i];
i = in & 0x0f;
out += hex[i];
}
return out;
}
4.完整参考
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.com.jslh.zjcdprogrect">
<uses-permission android:name="android.permission.nfc" />
<uses-permission android:name="android.permission.internet" />
<uses-feature
android:name="android.hardware.nfc"
android:required="true" />
<application
android:name=".common.myapplication"
android:allowbackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundicon="@mipmap/ic_launcher_round"
android:supportsrtl="true"
android:theme="@style/apptheme">
<activity android:name=".loginactivity">
<intent-filter>
<action android:name="android.intent.action.main" />
<category android:name="android.intent.category.launcher" />
</intent-filter>
</activity>
<activity android:name=".saoka.workactivity">
<intent-filter>
<action android:name="android.nfc.action.tag_discovered" />
<data android:mimetype="text/plain" />
</intent-filter>
<!--<meta-data android:name="android.nfc.action.tech_discovered" android:resource="@xml/nfc_tech_filter" />-->
</activity>
</application>
</manifest>
package cn.com.jslh.zjcdprogrect.saoka;
import android.app.pendingintent;
import android.content.context;
import android.content.intent;
import android.content.intentfilter;
import android.nfc.nfcadapter;
import android.nfc.tag;
import android.os.bundle;
import android.support.v7.app.appcompatactivity;
import cn.com.jslh.zjcdprogrect.r;
public class workactivity extends appcompatactivity {
private nfcadapter mnfcadapter;
private pendingintent pi;
private intentfilter tagdetected;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_work);
//初始化nfcadapter
mnfcadapter = nfcadapter.getdefaultadapter(this);
//初始化pendingintent
// 初始化pendingintent，当有nfc设备连接上的时候，就交给当前activity处理
pi = pendingintent.getactivity(this, 0, new intent(this, getclass())
.addflags(intent.flag_activity_single_top), 0);
// 新建intentfilter，使用的是第二种的过滤机制
// tagdetected = new intentfilter(nfcadapter.action_tech_discovered);
// tagdetected.addcategory(intent.category_default);
}
@override
protected void onnewintent(intent intent) {
super.onnewintent(intent);
// 当前app正在前端界面运行，这个时候有intent发送过来，那么系统就会调用onnewintent回调方法，将intent传送过来
// 我们只需要在这里检验这个intent是否是nfc相关的intent，如果是，就调用处理方法
if (nfcadapter.action_tag_discovered.equals(intent.getaction())) {
processintent(intent);
}
}
@override
protected void onresume() {
super.onresume();
mnfcadapter.enableforegrounddispatch(this, pi, null, null);
}
/**
* parses the ndef message from the intent and prints to the textview
*/
private void processintent(intent intent) {
//取出封装在intent中的tag
tag tagfromintent = intent.getparcelableextra(nfcadapter.extra_tag);
string cardid =bytearraytohexstring(tagfromintent.getid());
}
public static void startactivity(context context){
intent intent = new intent();
intent.setclass(context,workactivity.class);
context.startactivity(intent);
}
private string bytearraytohexstring(byte[] inarray) {
int i, j, in;
string[] hex = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a",
"b", "c", "d", "e", "f" };
string out = "";
for (j = 0; j < inarray.length; ++j) {
in = (int) inarray[j] & 0xff;
i = (in >> 4) & 0x0f;
out += hex[i];
i = in & 0x0f;
out += hex[i];
}
return out;
}
}
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