Android实现读取NFC卡卡号示例
作者:I_Gisvity 时间:2021-08-06 21:08:39
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; }}
来源:http://blog.csdn.net/double0zhou/article/details/54021094