Android实现读取NFC卡卡号示例
Android实现读取NFC卡卡号示例，具体如下：
1.权限
<uses-permissionandroid:name="android.permission.NFC"/> <uses-feature android:name="android.hardware.nfc" android:required="true"/>
2.注册(静态)
<intent-filter> <actionandroid:name="android.nfc.action.TAG_DISCOVERED"/> <dataandroid: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,newIntent(this,getClass()) .addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP),0);
启动
@Override
protectedvoidonResume(){
super.onResume();
mNfcAdapter.enableForegroundDispatch(this,pi,null,null);//启动
}
获取数据
@Override
protectedvoidonNewIntent(Intentintent){
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
/**
*ParsestheNDEFMessagefromtheintentandprintstotheTextView
*/
privatevoidprocessIntent(Intentintent){
//取出封装在intent中的TAG
TagtagFromIntent=intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
StringCardId=ByteArrayToHexString(tagFromIntent.getId());
}
privateStringByteArrayToHexString(byte[]inarray){
inti,j,in;
String[]hex={"0","1","2","3","4","5","6","7","8","9","A",
"B","C","D","E","F"};
Stringout="";
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];
}
returnout;
}
4.完整参考
<?xmlversion="1.0"encoding="utf-8"?> <manifestxmlns:android="http://schemas.android.com/apk/res/android" package="cn.com.jslh.zjcdprogrect"> <uses-permissionandroid:name="android.permission.NFC"/> <uses-permissionandroid: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"> <activityandroid:name=".LoginActivity"> <intent-filter> <actionandroid:name="android.intent.action.MAIN"/> <categoryandroid:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> <activityandroid:name=".saoka.WorkActivity"> <intent-filter> <actionandroid:name="android.nfc.action.TAG_DISCOVERED"/> <dataandroid:mimeType="text/plain"/> </intent-filter> <!--<meta-dataandroid:name="android.nfc.action.TECH_DISCOVERED"android:resource="@xml/nfc_tech_filter"/>--> </activity> </application> </manifest>
packagecn.com.jslh.zjcdprogrect.saoka;
importandroid.app.PendingIntent;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.content.IntentFilter;
importandroid.nfc.NfcAdapter;
importandroid.nfc.Tag;
importandroid.os.Bundle;
importandroid.support.v7.app.AppCompatActivity;
importcn.com.jslh.zjcdprogrect.R;
publicclassWorkActivityextendsAppCompatActivity{
privateNfcAdaptermNfcAdapter;
privatePendingIntentpi;
privateIntentFiltertagDetected;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
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,newIntent(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=newIntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
//tagDetected.addCategory(Intent.CATEGORY_DEFAULT);
}
@Override
protectedvoidonNewIntent(Intentintent){
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
protectedvoidonResume(){
super.onResume();
mNfcAdapter.enableForegroundDispatch(this,pi,null,null);
}
/**
*ParsestheNDEFMessagefromtheintentandprintstotheTextView
*/
privatevoidprocessIntent(Intentintent){
//取出封装在intent中的TAG
TagtagFromIntent=intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
StringCardId=ByteArrayToHexString(tagFromIntent.getId());
}
publicstaticvoidstartActivity(Contextcontext){
Intentintent=newIntent();
intent.setClass(context,WorkActivity.class);
context.startActivity(intent);
}
privateStringByteArrayToHexString(byte[]inarray){
inti,j,in;
String[]hex={"0","1","2","3","4","5","6","7","8","9","A",
"B","C","D","E","F"};
Stringout="";
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];
}
returnout;
}
}
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