Android Open Source - easyNFC-dev Write Map 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;
/* www . j  a v  a2  s.c om*/

import java.io.IOException;
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 WriteMapActivity 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.writemap);

        final EditText latitudeEditText = (EditText)this.findViewById(R.id.latitudetext);
        final EditText longitudeEditText = (EditText)this.findViewById(R.id.longitudeedittext);

        Button writeMapButton = (Button)this.findViewById(R.id.mapwritebutton);
        writeMapButton.setOnClickListener(new android.view.View.OnClickListener() 
        {
          public void onClick(View view) {
            String latitude = latitudeEditText.getText().toString();
            String longitude = longitudeEditText.getText().toString();        
             urlAddress = "geo:"+latitude+","+longitude;
            TextView messageText = (TextView)findViewById(R.id.latitudetext);
            messageText.setText("Touch NFC Tag to share GEO location\n"+
                "Latitude: "+latitude+"\nLongitude: "+longitude);    
                        
          }
        });
    
         
       
       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);  
        String externalType = "nfclab.com:geoService";
    NdefRecord extRecord = new NdefRecord(NdefRecord.TNF_EXTERNAL_TYPE, externalType.getBytes(), new byte[0], urlAddress.getBytes());
        NdefMessage newMessage = new NdefMessage(new NdefRecord[] { extRecord});
        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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