如何通过Android NFC传输纯文本?

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问题描述

我是Android NFC的新手，正在android中开发NFC应用程序.我的想法是设备A需要向设备B发送纯文本.在Android NFC中可以吗?我刚刚在Reader和Writer上尝试了Tag Dispatcher(enableForegroundDispatch，disableForegroundDispatch).我的读者端代码是:

I am new to Android NFC and developing NFC application in android. My idea is Device A need to send a plain text to Device B. Is it possible in Android NFC?I just tried with Tag Dispatcher (enableForegroundDispatch , disableForegroundDispatch) on both Reader and Writer.My Reader side code is :

nfcAdapter.enableForegroundDispatch(this, pendingIntent, intentFilters, techList)
override fun onNewIntent(intent: Intent?) {
intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES)?.also { rawMessages ->
            val messages: List<NdefMessage> = rawMessages.map { it as NdefMessage }

            for (message in messages) {
                for (record in message.records) {
                    println(" ${record.toString()}")
                }
            }
        }
}

我的Writer辅助代码为:

My Writer side code is:

nfcAdapter.enableForegroundDispatch(
        this, pendingIntent, intentFilters, techList)
override fun onNewIntent(intent: Intent?) {
if (action.equals(NfcAdapter.EXTRA_TAG)) {
        val tagFromIntent = intent.getParcelableExtra<Tag>(NfcAdapter.EXTRA_TAG)
        if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)
            || NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)
        ) {
            println("testing=============== tag discovered ")
            writeNdefMessage(tagFromIntent!!, "This is my first app")
        }
    }}

private fun writeNdefMessage(tag: Tag, message: String) {
    val record: NdefRecord = newTextRecord(message, Locale.ENGLISH, true)!!
    val ndefMessage = NdefMessage(arrayOf(record))
    try {
        if (isExist(tag.techList, NdefFormatable::class.java.name)) {
            val ndefFormatable = NdefFormatable.get(tag)
            try {
                if (!ndefFormatable.isConnected) {
                    ndefFormatable.connect()
                }
                ndefFormatable.format(ndefMessage)
            } finally {
                ndefFormatable.close()
            }
        } else if (isExist(tag.techList, Ndef::class.java.name)) {
            val ndef = Ndef.get(tag)
            try {
                if (!ndef.isConnected) {
                    ndef.connect()
                }
                if (ndef.isWritable) {
                    ndef.writeNdefMessage(ndefMessage)
                }
            } finally {
                ndef.close()
            }
        }
    } catch (e: FormatException) {
        println("Format failed exception")
    } catch (e: IOException) {
        println("")
    }
}

当我扫描Tag时启动了应用程序(通过AndroidManifest.xml详细信息).但是我无法通过NFC发送纯文本.我不知道我做错了什么.我不知道这种方法是对还是错.请帮助我进行此操作.

Application is launched when I scan the Tag (via AndroidManifest.xml details). But I am not able to send plain text via NFC. I don't know what I did wrong. I don't know whether the approach is right or wrong. Please help me to proceed this.

谢谢.

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如何通过Android NFC传输纯文本?

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