1 package skyseraph.easytagwrite;
  2 
  3 import skyseraph.android.util.CustomDialog;
  4 import skyseraph.android.util.LogUtil;
  5 import skyseraph.android.util.MyConstant;
  6 import skyseraph.android.util.nfc.BobNdefMessage;
  7 
  8 import android.app.Activity;
  9 import android.app.AlertDialog;
 10 import android.app.Dialog;
 11 import android.app.PendingIntent;
 12 import android.content.Context;
 13 import android.content.DialogInterface;
 14 import android.content.Intent;
 15 import android.content.IntentFilter;
 16 import android.graphics.Color;
 17 import android.nfc.NdefMessage;
 18 import android.nfc.NfcAdapter;
 19 import android.nfc.Tag;
 20 import android.nfc.tech.Ndef;
 21 import android.nfc.tech.NdefFormatable;
 22 import android.os.AsyncTask;
 23 import android.os.Bundle;
 24 import android.provider.Settings;
 25 import android.util.DisplayMetrics;
 26 import android.view.Menu;
 27 import android.view.MenuItem;
 28 import android.view.View;
 29 import android.view.WindowManager;
 30 import android.widget.AdapterView;
 31 import android.widget.AdapterView.OnItemSelectedListener;
 32 import android.widget.ArrayAdapter;
 33 import android.widget.Button;
 34 import android.widget.EditText;
 35 import android.widget.Spinner;
 36 import android.widget.TextView;
 37 import android.widget.Toast;
 38 
 39 import java.io.IOException;
 40 
 41 public class MainActivity extends Activity {
 42     private static final String TAG_ASSIST = "[MainActivity]-";
 43 
 44     // NFC Declarations
 45     private NfcAdapter mNfcAdapter = null;
 46 
 47     private IntentFilter[] mFilters = null;
 48 
 49     private PendingIntent mPendingIntent = null;
 50 
 51     private String[][] mTechLists = null;
 52 
 53     private Context mContext;
 54 
 55     private NdefMessage NDEFMsg2Write = null;
 56 
 57     // UI
 58     private EditText mEditText1 = null;
 59 
 60     private EditText mEditText2 = null;
 61 
 62     private TextView mTextView1 = null;
 63 
 64     private TextView mTextView2 = null;
 65 
 66     private Spinner mSpinner = null;
 67 
 68     private ArrayAdapter mAdapter = null;
 69 
 70     private Button writeUrlButton, saveUrlButton, exitButton;
 71 
 72     private static final String[] spinnerStr = {
 73             "TNF_ABSOLUTE_URI", "TNF_MIME_MEDIA", "TNF_WELL_KNOWN RTD-TEXT",
 74             "TNF_WELL_KNOWN RTD-URI", "TNF_EXTERNAL_TYPE",
 75     };
 76 
 77     private String payloadStr = "";
 78 
 79     private String typeStr = "";
 80 
 81     private int tagTypeFlag = 0;//
 82 
 83     private AlertDialog alertDialog = null;
 84 
 85     @Override
 86     protected void onCreate(Bundle savedInstanceState) {
 87         super.onCreate(savedInstanceState);
 88         setContentView(R.layout.activity_main);
 89         mContext = this;
 90 
 91         checkNFCFunction(); // NFC Check
 92         initUI();// Init UI
 93         initNFC();// Init NFC
 94     }
 95 
 96     @Override
 97     public boolean onCreateOptionsMenu(Menu menu) {
 98         // Inflate the menu; this adds items to the action bar if it is present.
 99         getMenuInflater().inflate(R.menu.main, menu);
100         return true;
101     }
102 
103     @Override
104     public boolean onOptionsItemSelected(MenuItem item) {
105         // TODO Auto-generated method stub
106         super.onOptionsItemSelected(item);
107         switch (item.getItemId())
108         // item clicked
109         {
110             case R.id.action_settings:
111                 // Intent setnfc = new
112                 // Intent(Settings.ACTION_WIRELESS_SETTINGS);
113                 Intent setnfc = new Intent(Settings.ACTION_NFC_SETTINGS);
114                 startActivity(setnfc);
115                 break;
116             case R.id.action_about:
117                 dialog();
118                 break;
119         }
120         return true;
121     }
122 
123     protected void dialog() {
124         AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
125         builder.setTitle(getString(R.string.dialog_notice));
126         alertDialog = builder.create();
127         builder.setCancelable(true);// back
128         alertDialog.setCanceledOnTouchOutside(true);
129         alertDialog.show();
130     }
131 
132     @Override
133     public void onResume() {
134         super.onResume();
135         if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) {
136             LogUtil.i(MyConstant.TAG, TAG_ASSIST + "ACTION_TECH_DISCOVERED");
137             // get NFC object
138             Tag detectTag = getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG);
139             // validate that this tag can be written
140             if (supportedTechs(detectTag.getTechList())) {
141                 switch (tagTypeFlag) {
142                     case 0:// ABSOLUTE_URI
143                         NDEFMsg2Write = BobNdefMessage.getNdefMsg_from_ABSOLUTE_URI(payloadStr, false);
144                         // writeNdefMessageToTag(NDEFMsg2Write, detectTag); // By
145                         // Function
146                         new WriteTask(this, NDEFMsg2Write, detectTag).execute(); // By
147                                                                                  // AsyncTask
148                                                                                  // Class
149                         break;
150                     case 1:// MIME_MEDIA
151                         NDEFMsg2Write = BobNdefMessage.getNdefMsg_from_MIME_MEDIA(payloadStr,
152                                 "application/skyseraph.nfc_demo", false);
153                         // writeNdefMessageToTag(NDEFMsg2Write, detectTag);
154                         new WriteTask(this, NDEFMsg2Write, detectTag).execute();
155                         break;
156                     case 2:// RTD_TEXT
157                         NDEFMsg2Write = BobNdefMessage.getNdefMsg_from_RTD_TEXT(payloadStr, false,
158                                 false);
159                         // writeNdefMessageToTag(NDEFMsg2Write, detectTag);
160                         new WriteTask(this, NDEFMsg2Write, detectTag).execute();
161                         break;
162                     case 3:// RTD_URI
163                         NDEFMsg2Write = BobNdefMessage.getNdefMsg_from_RTD_URI(payloadStr, (byte)0x01,
164                                 false);
165                         // writeNdefMessageToTag(NDEFMsg2Write, detectTag);
166                         new WriteTask(this, NDEFMsg2Write, detectTag).execute();
167                         break;
168                     case 4:// EXTERNAL_TYPE
169                         NDEFMsg2Write = BobNdefMessage.getNdefMsg_from_EXTERNAL_TYPE(payloadStr, false);
170                         // writeNdefMessageToTag(NDEFMsg2Write, detectTag);
171                         new WriteTask(this, NDEFMsg2Write, detectTag).execute();
172                         break;
173                     default:// RTD_URI
174                         NDEFMsg2Write = BobNdefMessage.getNdefMsg_from_RTD_URI(payloadStr, (byte)0x01,
175                                 false);
176                         // writeNdefMessageToTag(NDEFMsg2Write, detectTag);
177                         new WriteTask(this, NDEFMsg2Write, detectTag).execute();
178                         break;
179                 }
180             } else {
181                 Toast.makeText(mContext, "This tag type is not supported", Toast.LENGTH_SHORT).show();
182             }
183         } 
184     }
185 
186     @Override
187     public void onNewIntent(Intent intent) {
188         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "Discovered tag with intent: " + intent);
189         setIntent(intent);
190     }
191 
192     @Override
193     public void onPause() {
194         super.onPause();
195         if (alertDialog != null)
196             alertDialog.cancel();
197         disableForegroundDispatch();
198     }
199 
200     private void initUI() {
201         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "into initUI");
202         // TODO Auto-generated method stub
203         mEditText1 = (EditText)this.findViewById(R.id.write_ndef_tag_et1);
204         mEditText2 = (EditText)this.findViewById(R.id.write_ndef_tag_et2);
205         mTextView1 = (TextView)findViewById(R.id.write_ndef_tag_tv1);
206         mTextView2 = (TextView)findViewById(R.id.write_ndef_tag_tv2);
207 
208         saveUrlButton = (Button)findViewById(R.id.write_ndef_tag_saveBtn);
209         saveUrlButton.setOnClickListener(new View.OnClickListener() {
210             public void onClick(View v) {
211                 writeUrlButton.setEnabled(true);
212                 switch (tagTypeFlag) {
213                     case 0:// ABSOLUTE_URI
214                         payloadStr = mEditText1.getText().toString();
215                         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "payloadStr=" + payloadStr);
216                         mTextView1.setText("(Touch NFC Tag to write-ABSOLUTE_URI)： " + payloadStr);
217                         mTextView1.setTextColor(Color.BLUE);
218                         break;
219                     case 1:// MIME_MEDIA
220                         payloadStr = mEditText2.getText().toString();
221                         typeStr = mEditText1.getText().toString();
222                         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "payloadStr=" + payloadStr
223                                 + ",typeStr=" + typeStr);
224                         mTextView1.setText("Touch NFC Tag to write-MIME_MEDIA)： " + typeStr);
225                         mTextView1.setTextColor(Color.BLUE);
226                         mTextView2
227                                 .setText("Touch NFC Tag to write-MIME_MEDIA，Data)： " + payloadStr);
228                         mTextView2.setTextColor(Color.BLUE);
229                         break;
230                     case 2:// RTD_TEXT
231                         payloadStr = mEditText1.getText().toString();
232                         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "payloadStr=" + payloadStr);
233                         mTextView1.setText("(Touch NFC Tag to write-RTD_TEXT)： " + payloadStr);
234                         mTextView1.setTextColor(Color.BLUE);
235                         break;
236                     case 3:// RTD_URI
237                         payloadStr = mEditText1.getText().toString();
238                         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "payloadStr=" + payloadStr);
239                         mTextView1.setText("(Touch NFC Tag to write-RTD_URI)：  http://www."
240                                 + payloadStr);
241                         mTextView1.setTextColor(Color.BLUE);
242                         break;
243                     case 4:// EXTERNAL_TYPE_SMS
244                         typeStr = "skyseraph.nfc_demo:externalType";
245                         payloadStr = mEditText2.getText().toString();
246                         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "payloadStr=" + payloadStr);
247                         mTextView1.setText("Touch NFC Tag to write-EXTERNAL_TYPE)： " + payloadStr);
248                         mTextView1.setTextColor(Color.BLUE);
249                         break;
250                     default:// RTD_URI
251                         payloadStr = mEditText1.getText().toString();
252                         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "payloadStr=" + payloadStr);
253                         mTextView1.setText("(Touch NFC Tag to write)： http://www." + payloadStr);
254                         mTextView1.setTextColor(Color.BLUE);
255                         break;
256                 }
257             }
258         });
259 
260         writeUrlButton = (Button)this.findViewById(R.id.write_ndef_tag_writeBtn);
261         writeUrlButton.setEnabled(false);
262         writeUrlButton.setOnClickListener(new View.OnClickListener() {
263             public void onClick(View view) {
264                 // Write to a tag for as long as the dialog is shown.
265                 enableForegroundDispatch();
266                 AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
267                 builder.setTitle("Touch tag to write").setOnCancelListener(
268                         new DialogInterface.OnCancelListener() {
269                             @Override
270                             public void onCancel(DialogInterface dialog) {
271                                 LogUtil.i(MyConstant.TAG, TAG_ASSIST + "mTagWriter - onCancel");
272                                 disableForegroundDispatch();
273                             }
274                         });
275                 alertDialog = builder.create();
276                 alertDialog.setCanceledOnTouchOutside(false);
277                 alertDialog.show();
278             }
279         });
280 
281         exitButton = (Button)findViewById(R.id.write_ndef_tag_exitBtn);
282         exitButton.setOnClickListener(new View.OnClickListener() {
283             public void onClick(View v) {
284                 finish();
285             }
286         });
287 
288         mSpinner = (Spinner)findViewById(R.id.write_ndef_tag_sp);
289         mAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, spinnerStr);
290         mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
291         mSpinner.setAdapter(mAdapter);
292         mSpinner.setOnItemSelectedListener(new SpinnerXMLSelectedListener());
293         mSpinner.setVisibility(View.VISIBLE);
294         mSpinner.setSelection(0, true);
295     }
296 
297     class SpinnerXMLSelectedListener implements OnItemSelectedListener {
298         public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
299             LogUtil.i(MyConstant.TAG,
300                     TAG_ASSIST + "What you have selected=" + mAdapter.getItem(arg2) + ",position="
301                             + arg2);
302             saveUrlButton.setEnabled(true);
303             writeUrlButton.setEnabled(false);
304             switch (arg2) {
305                 case 0:// ABSOLUTE_URI
306                     tagTypeFlag = 0;
307                     mTextView1
308                             .setText("Please input a absolute uri,exp: http://www.baidu.com/index.html");
309                     mTextView1.setTextColor(Color.RED);
310                     mEditText2.setVisibility(View.GONE);
311                     mTextView2.setVisibility(View.GONE);
312                     break;
313                 case 1:// MIME_MEDIA
314                     tagTypeFlag = 1;
315                     mTextView2
316                             .setText("Please input a mime_media, exp: application/skyseraph.nfc_demo");
317                     mTextView1.setTextColor(Color.RED);
318                     mEditText2.setVisibility(View.VISIBLE);
319                     mTextView2.setVisibility(View.VISIBLE);
320                     mTextView1
321                             .setText("Please input your mime_media data, exp: This is a MIME_MEDIA");
322                     mTextView2.setTextColor(Color.RED);
323                     break;
324                 case 2:// RTD TEXT
325                     tagTypeFlag = 2;
326                     mTextView1.setText("Please input a RTD TEXT,exp: This is an RTD-TEXT");
327                     mTextView1.setTextColor(Color.RED);
328                     mEditText2.setVisibility(View.GONE);
329                     mTextView2.setVisibility(View.GONE);
330                     break;
331                 case 3: // RTD URI
332                     tagTypeFlag = 3;
333                     mTextView1.setText("Please input a RTD uri,exp: baidu.com");
334                     mTextView1.setTextColor(Color.RED);
335                     mEditText2.setVisibility(View.GONE);
336                     mTextView2.setVisibility(View.GONE);
337                     break;
338                 case 4:// EXTERNAL_TYPE
339                     tagTypeFlag = 4;
340                     mTextView1
341                             .setText("Please input a EXTERNAL_TYPE, exp: This is an EXTERNAL_TYPE");
342                     mTextView1.setTextColor(Color.RED);
343                     mEditText2.setVisibility(View.GONE);
344                     mTextView2.setVisibility(View.GONE);
345                     break;
346                 default:// RTD_URI
347                     tagTypeFlag = 3;
348                     mTextView1.setText("Please input a RTD uri,exp: baidu.com");
349                     mTextView1.setTextColor(Color.RED);
350                     mEditText2.setVisibility(View.GONE);
351                     mTextView2.setVisibility(View.GONE);
352                     break;
353             }
354         }
355 
356         public void onNothingSelected(AdapterView<?> arg0) {
357 
358         }
359     }
360 
361     /**
362      * Init NFC
363      */
364     private void initNFC() {
365         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "into initNFC");
366         mPendingIntent = PendingIntent.getActivity(this, 0,
367                 new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
368         // FLAG_ACTIVITY_SINGLE_TOP: not creating multiple instances of the same
369         // application.
370         IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
371         IntentFilter ndefDetected = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
372         IntentFilter techDetected = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
373         // ndef.addDataScheme("http");
374         // Intent filters for writing to a tag
375         mFilters = new IntentFilter[] {
376             ndefDetected,
377         };// just trying to find a tag,not ndef or tech
378 
379         mTechLists = new String[][] {
380                 new String[] {
381                     Ndef.class.getName()
382                 }, new String[] {
383                     NdefFormatable.class.getName()
384                 }
385         };
386     }
387 
388     /**
389      * @param message
390      * @param detectedTag
391      * @return
392      */
393     boolean writeNdefMessageToTag(NdefMessage message, Tag detectedTag) {
394         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "into writeNdefMessageToTag");
395         int size = message.toByteArray().length;
396         try {
397             Ndef ndef = Ndef.get(detectedTag);
398             if (ndef != null) {
399                 ndef.connect();
400 
401                 if (!ndef.isWritable()) {
402                     Toast.makeText(this, "Tag is read-only.", Toast.LENGTH_LONG).show();
403                     return false;
404                 }
405                 if (ndef.getMaxSize() < size) {
406                     Toast.makeText(
407                             this,
408                             "The data cannot written to tag, Tag capacity is " + ndef.getMaxSize()
409                                     + " bytes, message is " + size + " bytes.", Toast.LENGTH_LONG)
410                             .show();
411                     return false;
412                 }
413 
414                 ndef.writeNdefMessage(message);
415                 ndef.close();
416                 String str = "Message is written tag, message=" + message;
417                 Toast.makeText(this, str, Toast.LENGTH_LONG).show();
418                 return true;
419             } else {
420                 NdefFormatable ndefFormat = NdefFormatable.get(detectedTag);
421                 if (ndefFormat != null) {
422                     try {
423                         ndefFormat.connect();
424                         ndefFormat.format(message);
425                         ndefFormat.close();
426                         Toast.makeText(this, "The data is written to the tag ", Toast.LENGTH_SHORT)
427                                 .show();
428                         return true;
429                     } catch (IOException e) {
430                         Toast.makeText(this, "Failed to format tag", Toast.LENGTH_SHORT).show();
431                         return false;
432                     }
433                 } else {
434                     Toast.makeText(this, "NDEF is not supported", Toast.LENGTH_SHORT).show();
435                     return false;
436                 }
437             }
438         } catch (Exception e) {
439             Toast.makeText(this, "Write opreation is failed", Toast.LENGTH_SHORT).show();
440         }
441         return false;
442     }
443 
444     /**
445      * @Title: supportedTechs
446      * @Description: Check Support Techs
447      * @param @param techs
448      * @param @return
449      * @return boolean
450      * @throws
451      */
452     public static boolean supportedTechs(String[] techs) {
453         LogUtil.i(MyConstant.TAG, TAG_ASSIST + "into supportedTechs");
454         for (String s : techs) {
455             LogUtil.i(MyConstant.TAG, TAG_ASSIST + "all supportedTechs = " + s);
456         }
457         boolean ultralight = false;
458         boolean nfcA = false;
459         boolean ndef = false;
460         for (String tech : techs) {
461             if (tech.equals("android.nfc.tech.MifareUltralight")) {
462                 ultralight = true;
463                 LogUtil.i(MyConstant.TAG, TAG_ASSIST + "supportedTechs is:ultralight");
464             } else if (tech.equals("android.nfc.tech.NfcA")) {
465                 nfcA = true;
466                 LogUtil.i(MyConstant.TAG, TAG_ASSIST + "supportedTechs is:NfcA");
467             } else if (tech.equals("android.nfc.tech.Ndef")
468                     || tech.equals("android.nfc.tech.NdefFormatable")) {
469                 ndef = true;
470                 LogUtil.i(MyConstant.TAG, TAG_ASSIST + "supportedTechs is:Ndef/NdefFormatable");
471             } else if (tech.equals("android.nfc.tech.MifareClassic")) {
472                 LogUtil.i(MyConstant.TAG, TAG_ASSIST + "supportedTechs is:MifareClassic");
473             }
474         }
475         if (ultralight && nfcA && ndef) {
476             return true;
477         } else {
478             return false;
479         }
480     }
481 
482     /**
483      * enable TagWrite
484      */
485     private void enableForegroundDispatch() {
486         if (mNfcAdapter != null) {
487             mNfcAdapter.enableForegroundDispatch(this, mPendingIntent, mFilters, mTechLists);
488         }
489     }
490 
491     /**
492      * disable TagWrite
493      */
494     private void disableForegroundDispatch() {
495         if (mNfcAdapter != null) {
496             mNfcAdapter.disableForegroundDispatch(this);
497         }
498     }
499 
500     /**
501      * NFC Function Check By skyseraph 2013-2
502      */
503     private void checkNFCFunction() {
504         // TODO Auto-generated method stub
505         mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
506         // check the NFC adapter first
507         if (mNfcAdapter == null) {
508             // mTextView.setText("NFC apdater is not available");
509             Dialog dialog = null;
510             CustomDialog.Builder customBuilder = new CustomDialog.Builder(mContext);
511             customBuilder
512                     .setTitle(getString(R.string.inquire))
513                     .setMessage(getString(R.string.nfc_notice2))
514                     .setIcon(R.drawable.dialog_icon2)
515                     .setNegativeButton(getString(R.string.no),
516                             new DialogInterface.OnClickListener() {
517                                 public void onClick(DialogInterface dialog, int which) {
518                                     dialog.dismiss();
519                                     finish();
520                                 }
521                             })
522                     .setPositiveButton(getString(R.string.yes),
523                             new DialogInterface.OnClickListener() {
524                                 public void onClick(DialogInterface dialog, int which) {
525                                     dialog.dismiss();
526                                     finish();
527                                 }
528                             });
529             dialog = customBuilder.create();
530             dialog.setCancelable(false);// back
531             dialog.setCanceledOnTouchOutside(false);
532             SetDialogWidth(dialog).show();
533             return;
534         } else {
535             if (!mNfcAdapter.isEnabled()) {
536                 Dialog dialog = null;
537                 CustomDialog.Builder customBuilder = new CustomDialog.Builder(mContext);
538                 customBuilder
539                         .setTitle(getString(R.string.inquire))
540                         .setMessage(getString(R.string.nfc_notice3))
541                         .setIcon(R.drawable.dialog_icon2)
542                         .setNegativeButton(getString(R.string.no),
543                                 new DialogInterface.OnClickListener() {
544                                     public void onClick(DialogInterface dialog, int which) {
545                                         dialog.dismiss();
546                                         finish();
547                                     }
548                                 })
549                         .setPositiveButton(getString(R.string.yes),
550                                 new DialogInterface.OnClickListener() {
551                                     public void onClick(DialogInterface dialog, int which) {
552                                         dialog.dismiss();
553                                         Intent setnfc = new Intent(
554                                                 Settings.ACTION_WIRELESS_SETTINGS);
555                                         // Intent setnfc = new
556                                         // Intent(Settings.ACTION_NFC_SETTINGS);
557                                         startActivity(setnfc);
558                                     }
559                                 });
560                 dialog = customBuilder.create();
561                 dialog.setCancelable(false);// back
562                 dialog.setCanceledOnTouchOutside(false);
563                 SetDialogWidth(dialog).show();
564                 return;
565             }
566         }
567     }
568 
569     /**
570      * @param dialog
571      * @return
572      */
573     private Dialog SetDialogWidth(Dialog dialog) {
574         DisplayMetrics dm = new DisplayMetrics();
575         getWindowManager().getDefaultDisplay().getMetrics(dm);
576         int screenWidth = dm.widthPixels;
577         int screenHeight = dm.heightPixels;
578         WindowManager.LayoutParams params = dialog.getWindow().getAttributes();
579         if (screenWidth > screenHeight) {
580             params.width = (int)(((float)screenHeight) * 0.875);
581 
582         } else {
583             params.width = (int)(((float)screenWidth) * 0.875);
584         }
585         dialog.getWindow().setAttributes(params);
586 
587         return dialog;
588     }
589 
590     /**
591      *********************************************************************** @Title ：WriteNdefTag.java
592      * @Package ：skyseraph.nfc_demo.tag.write
593      * @ClassName : WriteTask
594      * @Description ： TODO
595      * @author ： skyseraph00@163.com
596      * @date ： 2013-9-13 上午11:38:58
597      * @version ： V1.0
598      */
599     static class WriteTask extends AsyncTask<Void, Void, Void> {
600         Activity host = null;
601 
602         NdefMessage msg = null;
603 
604         Tag tag = null;
605 
606         String text = null;
607 
608         WriteTask(Activity host, NdefMessage msg, Tag tag) {
609             LogUtil.i(MyConstant.TAG, TAG_ASSIST + "into WriteTask AsyncTask");
610             this.host = host;
611             this.msg = msg;
612             this.tag = tag;
613         }
614 
615         @Override
616         protected Void doInBackground(Void... arg0) {
617             int size = msg.toByteArray().length;
618 
619             try {
620                 Ndef ndef = Ndef.get(tag);
621 
622                 if (ndef == null) {
623                     NdefFormatable formatable = NdefFormatable.get(tag);
624                     if (formatable != null) {
625                         try {
626                             formatable.connect();
627                             try {
628                                 formatable.format(msg);
629                             } catch (Exception e) {
630                                 text = "Failed to format tag，Tag refused to format";
631                             }
632                         } catch (Exception e) {
633                             text = "Failed to connect tag，Tag refused to connect";
634                         } finally {
635                             formatable.close();
636                         }
637                     } else {
638                         text = "NDEF is not supported in this Tag";
639                     }
640                 } else {
641                     ndef.connect();
642 
643                     try {
644                         if (!ndef.isWritable()) {
645                             text = "Tag is read-only";
646                         } else if (ndef.getMaxSize() < size) {
647                             text = "The data cannot written to tag，Message is too big for tag，Tag capacity is "
648                                     + ndef.getMaxSize() + " bytes, message is " + size + " bytes.";
649                         } else {
650                             ndef.writeNdefMessage(msg);
651                             text = "Message is written tag, message=" + msg;
652                         }
653                     } catch (Exception e) {
654                         text = "Tag refused to connect";
655                     } finally {
656                         ndef.close();
657                     }
658                 }
659             } catch (Exception e) {
660                 text = "Write opreation is failed，General exception: " + e.getMessage();
661                 LogUtil.i(MyConstant.TAG, TAG_ASSIST
662                         + "Exception when writing tag，Write opreation is failed" + text);
663             }
664 
665             return (null);
666         }
667 
668         @Override
669         protected void onPostExecute(Void unused) {
670             if (text != null) {
671                 Toast.makeText(host, text, Toast.LENGTH_SHORT).show();
672             }
673 
674             // host.finish(); // after writed, auto finish
675         }
676     }
677 }