Qui viene descritto come pubblicare su Facebook in modo automatico mediante un telefono abilitato con Rfid. In pratica si tratta dell'unione di diversi post precedenti ed in particolare
A differenza di Java, per creare una connessione Http in Android si devono prima settare i permessi nel file Manifest.xml (come al solito le modifiche rispetto ai post precedenti sono in giallo)
package com.example.test4;
import android.os.Bundle;
import android.app.Activity;
import android.os.StrictMode;
import android.util.Log;
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.widget.Toast;
import java.math.BigInteger;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class MainActivity extends Activity {
NfcAdapter adapter;
PendingIntent pendingIntent;
IntentFilter writeTagFilters[];
String[][] techListsArray;
@Override
protected void onCreate(Bundle savedInstanceState) {
StrictMode.ThreadPolicy policy = new StrictMode.
ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
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){
//Toast.makeText(getApplicationContext(), "Trovato Tag", Toast.LENGTH_SHORT).show();
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
byte[] tagId = intent.getByteArrayExtra(NfcAdapter.EXTRA_ID);
// trasmissione dati al server
try {
URL url = new URL("http://m.msn.unifi.it/luca/examples/rfid_server3.php?rfid="+bin2hex(tag.getId())+"&msg=cellulare");
HttpURLConnection connection;
connection = (HttpURLConnection) url.openConnection();
readStream(connection.getInputStream());
Toast.makeText(getApplicationContext(), bin2hex(tag.getId()), Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
}
}
private void readStream(InputStream in) {
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(in));
String line = "";
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
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;
}
}
