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-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;
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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