您如何在Android上读取NFC标签的唯一ID? [英] how do you read the unique ID of an NFC tag on android?

问题描述

Tag myTag = (Tag) intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
Log.i("tag ID", myTag.getId().toString());

这给了我一个像"[B @ 40521c40""的ID，但是这个ID每次读取都会改变.

This gives me an ID like "[B@40521c40" but this ID changes every read.

任何帮助将不胜感激.

谢谢.

推荐答案

您仍然需要将字节转换为字符串:

you still need to convert the byte to string:

private String bytesToHexString(byte[] src) {
    StringBuilder stringBuilder = new StringBuilder("0x");
    if (src == null || src.length <= 0) {
        return null;
    }

    char[] buffer = new char[2];
    for (int i = 0; i < src.length; i++) {
        buffer[0] = Character.forDigit((src[i] >>> 4) & 0x0F, 16);  
        buffer[1] = Character.forDigit(src[i] & 0x0F, 16);  
        System.out.println(buffer);
        stringBuilder.append(buffer);
    }

    return stringBuilder.toString();
}

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