Android Open Source - easyNFC-dev Write Mail Activity

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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;
//w  w w. j a  v  a 2s. c  o  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 WriteMailActivity 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.writemail);

        final EditText addressEditText = (EditText)this.findViewById(R.id.emailaddresseditText1);
        final EditText subjectEditText = (EditText)this.findViewById(R.id.subjecteditText2);
        final EditText mailBodyEditText = (EditText)this.findViewById(R.id.body);

        Button writeMailButton = (Button)this.findViewById(R.id.writeemailbutton1);
        writeMailButton.setOnClickListener(new android.view.View.OnClickListener() 
        {
          public void onClick(View view) {
            String mailAddress = addressEditText.getText().toString();
            String mailSubject = subjectEditText.getText().toString();
            String mailBody = mailBodyEditText.getText().toString();
            urlAddress = mailAddress+"?subject=" +mailSubject+"&body="+mailBody;
            TextView messageText = (TextView)findViewById(R.id.textView1);
            messageText.setText("Touch NFC Tag to share e-mail\n"+
            "Mail addres: "+mailAddress+"\nSubject: "+mailSubject+"\nBody: "+mailBody);
                        
          }
        });
    
            
        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] = 0x06;                                      //prefixes http://www. 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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