图片上的NFC标签 [英] Picture on nfc tags

问题描述

通过最新的NFC标签，可以存储多达8K就可以了。
所以，我想知道如何存储的照片上的标记，像恩智浦是否tagwriter应用程序？
我没有发现任何关于它的信息。
在此先感谢

With the latest nfc tags, it is possible to store up to 8k on it. So I would like to know how store picture on a tag, like the tagwriter Application by NXP does ? I found no information about it. Thanks in advance

推荐答案

您可以使用MIME类型的记录存储在NFC标签的图像。如果，例如，你的图像是JPEG图像，你可以使用MIME类型为图像/ JPEG。你NDEF记录然后可以是这样的：

You can use MIME type records to store images on NFC tags. If, for instance, your image is a JPEG image, you would use the MIME type "image/jpeg". You NDEF record could then look like this:

+----------------------------------------+
+ MB=1, ME=1, CF=0, SR=0, IL=0, TNF=MIME +
+----------------------------------------+
+ Type Length = 10                       +
+----------------------------------------+
+ Payload Length = N                     +
+----------------------------------------+
+ image/jpeg                             +
+----------------------------------------+
+ <Your image data (N bytes)>            +
+----------------------------------------+

在Android上，您使用可以创建这样的记录

On Android, you could create such a record using

byte[] myImage = ...;
NdefRecord myImageRecord = NdefRecord.createMime("image/jpeg", myImage);

，或使用构造 NdefRecord ：

byte[] myImage = ...;
NdefRecord myImageRecord = new NdefRecord(
        NdefRecord.TNF_MIME_MEDIA,
        "image/jpeg".getBytes("US-ASCII"),
        null,
        myImage
);

一旦你有一个标签的NDEF标签的柄（即通过接收和NFC发现意向），然后你可以写NDEF记录到标签：

Once you have a Tag handle of an NDEF tag (i.e. through receiving and NFC discovery intent), you could then write the NDEF record to the tag:

NdefMessage ndefMsg = new NdefMessage(new NdefRecord[] { myImageRecord });

Tag tag = ...;
Ndef ndefTag = Ndef.get(tag);
if (ndefTag != null) {
    ndefTag.connect();
    ndefTag.writeNdefMessage(ndefMsg);
    ndefTag.close();
} else {
    NdefFormatable ndefFormatable = NdefFormatable.get(tag);
    if (ndefFormatable != null) {
        ndefFormatable.connect();
        ndefFormatable.format(ndefMsg);
        ndefFormatable.close();
    }
}

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