正確的使用方法是什么

MifareUltralight.writePage()

方法?

查詢

getMaxTransceiveLength()

方法返回253字節。然而

tag

以888字節的速度公布。是

transceive()

因此

writePage()

應該被多次調用?正在寫入的有效負載的大小為457字節。

val jsonString = Gson().toJson(casualty)

val casualtyBytes = toBlob(casualty)

var currentPage = PAGE_OFFSET

val pageBytes = ByteArray(MifareUltralight.PAGE_SIZE)

var byteIndex = 0

for(i in 0 until casualtyBytes.size){

pageBytes[byteIndex] = casualtyBytes[i]

byteIndex++

if(byteIndex == 4 || i == (casualtyBytes.size-1)) {

tag.writePage(currentPage, pageBytes)

currentPage++

byteIndex = 0

}

}

fun toBlob(item : Any) : ByteArray{

val bos = ByteArrayOutputStream()

val gzip = GZIPOutputStream(bos) //compress

val oos = ObjectOutputStream(gzip)

oos.writeObject(item)

oos.close()

return bos.toByteArray()

}

例外情況

java.io.IOException: Transceive failed

at android.nfc.TransceiveResult.getResponseOrThrow(TransceiveResult.java:52)

at android.nfc.tech.BasicTagTechnology.transceive(BasicTagTechnology.java:151)

at android.nfc.tech.MifareUltralight.writePage(MifareUltralight.java:193)

at some.package.nfc.NfcCasualtyPublisher.writeToTag(NfcCasualtyPublisher.kt:42)

at some.package.nfc.NfcCasualtyPublisher.access$writeToTag(NfcCasualtyPublisher.kt:11)

at some.package.nfc.NfcCasualtyPublisher$publishCasualty$1.run(NfcCasualtyPublisher.kt:21)

at java.lang.Thread.run(Thread.java:818)

總結

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