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问题 I want to format a Mifare Ultralight C to handle NDEF messages. I have written the code below and it works just fine with the Mifare Classic 1K chips but it gets an IOExeption when i try and connect to the Ultralight C chip. NdefFormatable format = NdefFormatable.get(tag) if(format != null){ try { format.connect(); format.format(new NdefMessage(new NdefRecord(NdefRecord.TNF_EMPTY, null, null, null))); format.close(); Toast.makeText(getApplicationContext(), "Tag formated.", Toast.LENGTH_LONG)

问题 I wrote a nfc text tag like this myscheme://company?page=2&poiId=140 Then i've created an Intent-filter like this in my manifest file in order to open my app (and then call a WS with informations from tag) <intent-filter> <action android:name="android.nfc.action.NDEF_DISCOVERED"/> <category android:name="android.intent.category.DEFAULT"/> <data android:mimeType="text/plain" android:scheme="myscheme" android:host="company"/> </intent-filter> If i remove scheme and host params from data tag so

问题 What I've been trying to do is send an integer and receive it and then take that integer and set it to the timer that's counting down. So far I am able to send the integer and have the application open on the other device, However when the device loads the activity, it opens the MainActivity and not the Newgame activity. I must admit at this point I'm not code smart and a bit of a novice but here is the extract of code which deals with NFC Communication, This extract is from the Newgame.java:

问题 I'm about to implement the LLCP / SNEP protocol based on a PN532 NFC chip from NXP (purely for learning reasons) and i'm currently studying the LLCP specification of the NFC Forum. I'm pretty familiar with the MAC-layer of NFC as specified in ISO 18092, but i have some problems understanding how the "asynchronous balanced mode (ABM)" of LLCP works. To my understanding, the ABM enables the Initiator and the Target a possibility to send data at any time (on top of the actual master / slave

问题 Is it possible to create a cross platform NDEF Message to start an application on Android and Windows Phone passing additional data to the app? What I am trying to do: I have an application installed on Android and Windows Phone. It should be possible to start the applications with an NFC tag and I need to pass additional data from the tag (any string) to my applications. To start the applications with the NFC tags, I created a Windows Phone LaunchApp Record and an Android Application Record

问题 M24LR64 IC from STMicroelectronics supports ISO 15693 protocol, also called NfcV in Android NFC. When I placed my Nexus S phone (Android 4.0.4) near to my prototype tag board, I could hear a beep, and saw a message fired by the logcat: no tag fallback activity found for Intent { act = android.nfc.action.TAG_DISCOVERED} I wondered why the android dispatched the ACTION_TAG_DISCOVERED intent, not the ACTION_NDEF_DISCOVERED, because I had constructured the ndef format messages following the ST

问题 I have developed a system that can read NFC tag using a reader with PN532 chip. It works ok. I can read Mifare Classic and Mifare Ultralight tag. Now I'd like to use a Nexus Tablet with Android 4.4.2 to emulate a tag. I have no experience with android development but I think it is possible. I have set NFC communication in the Nexus Tablet but I think I have to download or write some application to emulate a Tag and an NDEF communication. What is the easiest way? 回答1: That depends on what

问题 I am using Apache cordova to build android applications. I made an application with NFC feature. we already written data into NFC tag, with mimetype: myApp/firstNFCApp . Inside my application whenever detect tag with this mimetype my application will read data and showing that data into user friendly manner. This way I implemented, it's working fine.This was the code I written to fetch data from tag nfc.addNdefListener( function(nfcEvent){ console.log(nfc.bytesToString(nfcEvent.tag

问题 I want to read NDEF content contained within a detected NFC tag (i.e., Tag id, Tag Size, Tag Type, Is tag Writable, Target Type, and message types). 回答1: I assume that you are talking about tags with NDEF content? In that case, you can do: Tag myTag = (Tag) nfcintent.getParcelableExtra(NfcAdapter.EXTRA_TAG); // get NDEF tag details Ndef ndefTag = Ndef.get(myTag); int size = ndefTag.getMaxSize(); // tag size boolean writable = ndefTag.isWritable(); // is tag writable? String type = ndefTag

问题 I'm trying to read an NDEF message from an NFC tag. The detection of the tag works correctly. For reading the NDEF data from the tag I'm running a TimerTask. The task polls the NDEF message from the tag with getNdefMessage() every 900 ms and updates the UI. The procedure works perfect until I remove the phone. Than the app freezes without a logcat error message. Does anyone have an idea why this happens? package com.example.infcdemo; import java.io.IOException; import java.util.Timer; import