L'interno con l'hardware NFC di un Nexus S (IFixIt) |
Si parte da un progetto vuoto (Hello World) e si effettuano le modeste modifiche indicate in giallo nel listato seguente
Per prima cosa si deve modificare il file Manifest per dichiarare l'uso del sensore NFC e si deve dichiare una nuova intent che si apre quando viene passato un tag sotto il lettore
Manifest.xml
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.test4"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="16" />
<uses-permission android:name="android.permission.NFC"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.test4.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:label="@string/event_verify" android:name="verifytagscanact">
<intent-filter>
<action android:name="android.nfc.action.TECH_DISCOVERED"/>
</intent-filter>
<meta-data android:name="android.nfc.action.TECH_DISCOVERED" android:resource="@xml/filter_nfc"/>
</activity>
</application>
</manifest>
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Si deve creare poi una nuova cartella xml nelle risorse e si crea un nuovo file filter_nfc
/xml/filter_nfc.xml
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<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
<tech-list>
<tech>android.nfc.tech.NfcA</tech>
<tech>android.nfc.tech.MifareClassic</tech>
</tech-list>
</resources>
<tech-list>
<tech>android.nfc.tech.NfcA</tech>
<tech>android.nfc.tech.MifareClassic</tech>
</tech-list>
</resources>
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la Main Activity e' composta da un solo Adapter che apre una nuova intent. A questo punto si apre la funzione OnNewIntent che legge il contenuto del tag
la Main Activity e' composta da un solo Adapter che apre una nuova intent. A questo punto si apre la funzione OnNewIntent che legge il contenuto del tag
MainActivity.java
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package com.example.test4;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.nfc.Tag;
import android.nfc.NfcAdapter;
import android.nfc.tech.MifareClassic;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentFilter.MalformedMimeTypeException;
import android.util.Log;
import android.widget.Toast;
import java.math.BigInteger;
public class MainActivity extends Activity {
NfcAdapter adapter;
PendingIntent pendingIntent;
IntentFilter writeTagFilters[];
String[][] techListsArray;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
adapter = NfcAdapter.getDefaultAdapter(this);
pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
try {
tagDetected.addDataType("*/*");
}
catch (MalformedMimeTypeException e) {
throw new RuntimeException("fail", e);
}
tagDetected.addCategory(Intent.CATEGORY_DEFAULT);
writeTagFilters = new IntentFilter[] { tagDetected };
techListsArray = new String[][] { new String[] { MifareClassic.class.getName() } };
}
static String bin2hex(byte[] data) {
return String.format("%0" + (data.length * 2) + "X", new BigInteger(1,data));
}
@Override
protected void onNewIntent(Intent intent){
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
byte[] tagId = intent.getByteArrayExtra(NfcAdapter.EXTRA_ID);
Toast.makeText(getApplicationContext(), bin2hex(tag.getId()), Toast.LENGTH_SHORT).show();
}
public void onPause() {
super.onPause();
adapter.disableForegroundDispatch(this);
}
public void onResume() {
super.onResume();
adapter.enableForegroundDispatch(this, pendingIntent, writeTagFilters, techListsArray);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
package com.example.test4;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.nfc.Tag;
import android.nfc.NfcAdapter;
import android.nfc.tech.MifareClassic;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentFilter.MalformedMimeTypeException;
import android.util.Log;
import android.widget.Toast;
import java.math.BigInteger;
public class MainActivity extends Activity {
NfcAdapter adapter;
PendingIntent pendingIntent;
IntentFilter writeTagFilters[];
String[][] techListsArray;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
adapter = NfcAdapter.getDefaultAdapter(this);
pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
try {
tagDetected.addDataType("*/*");
}
catch (MalformedMimeTypeException e) {
throw new RuntimeException("fail", e);
}
tagDetected.addCategory(Intent.CATEGORY_DEFAULT);
writeTagFilters = new IntentFilter[] { tagDetected };
techListsArray = new String[][] { new String[] { MifareClassic.class.getName() } };
}
static String bin2hex(byte[] data) {
return String.format("%0" + (data.length * 2) + "X", new BigInteger(1,data));
}
@Override
protected void onNewIntent(Intent intent){
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
byte[] tagId = intent.getByteArrayExtra(NfcAdapter.EXTRA_ID);
Toast.makeText(getApplicationContext(), bin2hex(tag.getId()), Toast.LENGTH_SHORT).show();
}
public void onPause() {
super.onPause();
adapter.disableForegroundDispatch(this);
}
public void onResume() {
super.onResume();
adapter.enableForegroundDispatch(this, pendingIntent, writeTagFilters, techListsArray);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
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