数据读取NFC标记的比较 [英] Comparing Data Read from NFC Tag

问题描述

我从NFC标签读取数据，并试图把它与一个字符串比较，但如果循环得到失败而对于字符串读取NFC的数据和比较它string.My code的比较作为。谢谢。

  Parcelable [] =的消息intent.getParcelableArrayExtra（NfcAdapter.EXTRA_NDEF_MESSAGES）;
                // NdefMessage消息= ndef.getNdefMessage（）;
                如果（短信！= NULL）{
                    NdefMessage [] = ndefMessages新NdefMessage [messages.length]
                    的for（int i = 0; I＆LT; messages.length;我++）{
                        ndefMessages [I] =（NdefMessage）消息[I]
                    }
                NdefRecord记录= ndefMessages [0] .getRecords（）[0];                字节[] =有效载荷record.getPayload（）;
                字符串文本=新的String（负载）;
                txtRead.setText（文本）;
                                如果（text.equalsIgnoreCase（沉默））{
                    Toast.makeText（getApplicationContext（），文本，Toast.LENGTH_LONG）.show（）;
                    AudioManager audiomanage =（AudioManager）getSystemService（Context.AUDIO_SERVICE）;
                    audiomanage.setRingerMode（AudioManager.RINGER_MODE_SILENT）;
                }
 

解决方案

这是NDEF文字记录包含的实际文本之前，对文本的语言信息，更重要的是，文本编码（使用的字符集）。您应检查这些字节知道实际的文本是否连接使用UTF-8或UTF-16 codeD（和使用，用于转换字节字符串）。

Hi I am reading data from a NFC Tag and trying to compare it with a String but the if loop is getting failed while comparison of string.My code for reading NFC data and comparing it with String is as. Thank You.

   Parcelable[] messages = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
                //NdefMessage message = ndef.getNdefMessage();
                if (messages != null) {
                    NdefMessage[] ndefMessages = new NdefMessage[messages.length];
                    for (int i = 0; i < messages.length; i++) {
                        ndefMessages[i] = (NdefMessage) messages[i];
                    }
                NdefRecord record = ndefMessages[0].getRecords()[0];

                byte[] payload = record.getPayload();
                String text = new String(payload);
                txtRead.setText(text);


                                if(text.equalsIgnoreCase("silent")){
                    Toast.makeText(getApplicationContext(), text, Toast.LENGTH_LONG).show();
                    AudioManager audiomanage = (AudioManager)getSystemService(Context.AUDIO_SERVICE);  
                    audiomanage.setRingerMode(AudioManager.RINGER_MODE_SILENT); 
                }

解决方案

An NDEF text record contains, before the actual text, information about the text's language and, more important, the text encoding (character set used). You should inspect those bytes to know whether the actual text is encoded in UTF-8 or UTF-16 (and use that for converting the bytes to a String).

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