Android Open Source - easyNFC-dev Writephoneactivity

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License

The source code is released under:

MIT License

Java Source Code

//Copyright 2013-2015 Shravan Jambukesan and Akash Kakkilaya
package com.pixel.nfcsettings;
// www .ja  v a  2  s .co m

  import java.io.IOException;
  import java.nio.charset.Charset;
  import android.app.Activity;
  import android.app.PendingIntent;
  import android.content.Intent;
  import android.content.IntentFilter;
  import android.nfc.NdefMessage;
  import android.nfc.NdefRecord;
  import android.nfc.NfcAdapter;
  import android.nfc.Tag;
  import android.nfc.tech.Ndef;
  import android.nfc.tech.NdefFormatable;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.View;
  import android.widget.Button;
  import android.widget.EditText;
  import android.widget.TextView;
  import android.widget.Toast;

  public class Writephoneactivity extends Activity {
    
    private NfcAdapter mNfcAdapter;
    private PendingIntent mPendingIntent;
      private IntentFilter[] mFilters;
      private String[][] mTechLists;
      private String urlAddress="";

      @Override
      public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
          setContentView(R.layout.writephone);

          final EditText phoneEditText = (EditText)this.findViewById(R.id.phonenumber);

          Button writePhoneButton = (Button)this.findViewById(R.id.phonebutton);
          writePhoneButton.setOnClickListener(new android.view.View.OnClickListener() 
          {
            public void onClick(View view) {
              urlAddress = phoneEditText.getText().toString();
               TextView messageText = (TextView)findViewById(R.id.number);
               messageText.setText("Touch NFC Tag to write "+urlAddress);                       
            }
          
   
          });  
         
          mNfcAdapter = NfcAdapter.getDefaultAdapter(this); 
          mPendingIntent = PendingIntent.getActivity(this, 0,
                   new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
           IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
           mFilters = new IntentFilter[] {
                ndef,
           };
             mTechLists = new String[][] { new String[] { Ndef.class.getName() },
                 new String[] { NdefFormatable.class.getName() }};
      }
      
      @Override
      public void onResume() {
          super.onResume();
          if (mNfcAdapter != null) mNfcAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters,
                  mTechLists);
      }

      @Override
      public void onNewIntent(Intent intent) {
          Log.i("Foreground dispatch", "Discovered tag with intent: " + intent);
          Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);  
          
          byte[] uriField = urlAddress.getBytes(Charset.forName("US-ASCII"));
          byte[] payload = new byte[uriField.length + 1];          //add 1 for the URI Prefix
          payload[0] = 0x05;                                      //prefixes tel: to the URI
          System.arraycopy(uriField, 0, payload, 1, uriField.length);  //appends URI to payload
          NdefRecord URIRecord  = new NdefRecord(
              NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_URI, new byte[0], payload);
          NdefMessage newMessage= new NdefMessage(new NdefRecord[] { URIRecord });
          writeNdefMessageToTag(newMessage, tag);     
      }

      @Override
      public void onPause() {
          super.onPause();
          mNfcAdapter.disableForegroundDispatch(this);
      }
      
      boolean writeNdefMessageToTag(NdefMessage message, Tag detectedTag) {
          int size = message.toByteArray().length;
          try {
              Ndef ndef = Ndef.get(detectedTag);
              if (ndef != null) {
                  ndef.connect();

                  if (!ndef.isWritable()) {
                    Toast.makeText(this, "Tag is read-only.", Toast.LENGTH_SHORT).show();
                      return false;
                  }
                  if (ndef.getMaxSize() < size) {
                    Toast.makeText(this, "The data cannot written to tag, Tag capacity is " + ndef.getMaxSize() + " bytes, message is " + size + " bytes.", Toast.LENGTH_SHORT).show();
                      return false;
                  }

                  ndef.writeNdefMessage(message);
                  ndef.close();                
                  Toast.makeText(this, "Message is written tag.", Toast.LENGTH_SHORT).show();
                  return true;
              } else {
                  NdefFormatable ndefFormat = NdefFormatable.get(detectedTag);
                  if (ndefFormat != null) {
                      try {
                        ndefFormat.connect();
                        ndefFormat.format(message);
                        ndefFormat.close();
                          Toast.makeText(this, "The data is written to the tag ", Toast.LENGTH_SHORT).show();
                          return true;
                      } catch (IOException e) {
                         Toast.makeText(this, "Failed to format tag", Toast.LENGTH_SHORT).show();
                          return false;
                      }
                  } else {
                     Toast.makeText(this, "NDEF is not supported", Toast.LENGTH_SHORT).show();
                      return false;
                  }
              }
          } catch (Exception e) {
            Toast.makeText(this, "Write opreation has failed", Toast.LENGTH_SHORT).show();
          }
          return false;
      }
  }

Java Source Code List

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