Android Open Source - android-nfcv-reader Main Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.nathansizemore.nfcvreader;
/* w  w  w .j  a v  a  2 s. c o m*/
import java.util.Arrays;

import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.NfcV;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
import android.widget.TextView;
import com.nathansizemore.nfcvreader.R;

public class MainActivity extends Activity {

  //Properties...
  private NfcAdapter nfcAdapter;
  private TextView textView;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    textView = (TextView)findViewById(R.id.textView);
    nfcAdapter = NfcAdapter.getDefaultAdapter(this);
    
    if (nfcAdapter.isEnabled() == false) {
      textView.setText("NFC is disabled.");
    }
    
    handleIntent(getIntent());
  }
  
  @Override
  public void onResume() {
    super.onResume();    
    setupForegroundDispatch(this, nfcAdapter);
  }
  
  @Override
  public void onPause() {
    stopForegroundDispatch(this, nfcAdapter);
    super.onPause();
  }
  
  @Override
  protected void onNewIntent(Intent intent) {
    handleIntent(intent);
  }
  
  /**
   * 
   * @param intent  The calling {@link Intent} (When an NfcV device is recognized)
   */
  private void handleIntent(Intent intent){
    if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) {
      Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
      Log.d("Action", "ACTION_TAG_DISCOVERED");      
      Log.d("Tag", tag.toString());
      String[] techList = tag.getTechList();
      String searchedTech = NfcV.class.getName();
      for (String tech : techList) {
        if (searchedTech.equals(tech)) {
          Log.d("Tech", tech);
          new NfcVReaderTask().execute(tag);
          break;
        }
      }
    }
  }
  
  /**
   * 
   * @param activity  The {@link Activity} requesting foreground dispatch.
   * @param adapter  The {@link NfcAdapter} used for the foreground dispatch.
   */
  public static void setupForegroundDispatch(final Activity activity, NfcAdapter adapter) {
    final Intent intent = new Intent(activity.getApplicationContext(), activity.getClass());
    intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    
    final PendingIntent pendingIntent = PendingIntent.getActivity(activity.getApplicationContext(), 0, intent, 0);
    
    IntentFilter[] filters = new IntentFilter[1];
    String[][] techList = new String[][]{};
    filters[0] = new IntentFilter();
    filters[0].addAction(NfcAdapter.ACTION_TAG_DISCOVERED);
    filters[0].addCategory(Intent.CATEGORY_DEFAULT);
    
    adapter.enableForegroundDispatch(activity, pendingIntent, filters, techList);
  }
  
  /**
   * 
   * @param activity  The {@link BaseActivty} requesting to stop the foreground dispatch
   * @param adapter  The {@link NfcAdapter} used for the foreground dispatch
   */
  public static void stopForegroundDispatch(final Activity activity, NfcAdapter adapter) {
    adapter.disableForegroundDispatch(activity);
  }
  
  private class NfcVReaderTask extends AsyncTask<Tag, Void, String> {
    
    @Override
    protected String doInBackground(Tag... params) {
      Tag tag = params[0];
      NfcV nfcvTag = NfcV.get(tag);
      byte[] tagID = nfcvTag.getTag().getId();
      Log.d("Hex ID", getHex(tagID));
      
      return Arrays.toString(tagID);      
    }
    
    /**
     * 
     * @param bytes  Array of bytes read from {@link NfcV.get(Tag)}
     * @return String representing ID as Hex
     */
    private String getHex(byte[] bytes) {
      StringBuilder sb = new StringBuilder();
      for (int x = 0; x < bytes.length; x++) {
        int bit = bytes[x] & 0xFF;
        if (bit < 0x10) {
          sb.append('0');
        }
        sb.append(Integer.toHexString(bit));
        sb.append(" ");
      }
      return sb.toString();
    }
    
    @Override
    protected void onPostExecute(String result) {
      if (result != null) {
        textView.setText("Hex ID: " + result);
      }
    }    
  }
}

Java Source Code List

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