NDEF文本格式解析

============》》Record Type Definition Technical Specificaltions

 

public class TextRecord {
    private final String mText;

    private TextRecord(String text) {
        // TODO Auto-generated constructor stub

        mText = text;
    }

    public String getText() {
        return mText;
    }

    public static TextRecord parse(NdefRecord ndefRecord) {
        //
        if (ndefRecord.getTnf() != NdefRecord.TNF_WELL_KNOWN) {
            return null;
        }

        if (!Arrays.equals(ndefRecord.getType(), NdefRecord.RTD_TEXT)) {
            return null;
        }

        try {

            byte[] palyload = ndefRecord.getPayload();
            // 根据最高位判断字符编码
            String textEncoding = ((palyload[0] & 0x80) == 0) ? "UTF-8"
                    : "UTF-16";
            // 根据第六位获得语言编码长度
            int languageCodeLength = palyload[0] & 0x3f;
            // 获得语言编码
            String languageCod = new String(palyload, 1, languageCodeLength,
                    "US-ASCII");

            String text = new String(palyload, languageCodeLength + 1,
                    palyload.length - languageCodeLength - 1, textEncoding);

            return new TextRecord(text);

        } catch (Exception e) {
            // TODO: handle exception
            throw new IllegalArgumentException();
        }

    }
}