我正在尝试以下方法:
为了加快测试开始我已经使用应用程序Tagwriter(https://play.google.com/store/apps/details?id=com.nxp.nfc.tagwriter&hl=de)来编写满足我需求的标签:"创建纯文本"和"添加启动应用程序"在下一个窗口中。
在与标签联系后,我的手机将启动我的应用程序,它甚至会正确读取识别字符串。但是我也想让它从我自己的应用程序中编写标记,而不是引用另一个。
我测试了几种方法,但没有一种方法有效。要么我的应用程序根本没有启动,要么它无法读取字符串。任何人都可以帮助我吗?
public static boolean writeTag(String textToWrite, Tag tag)
{
Miscellaneous.logEvent("i", "NFC", "Attempting to write tag...", 2);
String packageName = Miscellaneous.getAnyContext().getPackageName();
NdefRecord appRecord = NdefRecord.createApplicationRecord(packageName);
// Record with actual data we care about
NdefRecord textRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA,
new String("application/" + packageName)
.getBytes(Charset.forName("US-ASCII")),
null, textToWrite.getBytes());
// Complete NDEF message with both records
NdefMessage completeMessageToWrite = new NdefMessage(new NdefRecord[] {textRecord, appRecord});
int size = completeMessageToWrite.toByteArray().length;
try
{
Ndef ndef = Ndef.get(tag);
if (ndef != null)
{
ndef.connect();
if (ndef.isWritable() && ndef.getMaxSize() > size)
{
ndef.writeNdefMessage(completeMessageToWrite);
Miscellaneous.logEvent("i", "NFC", "Done writing tag.", 2);
return true;
}
}
else
{
NdefFormatable format = NdefFormatable.get(tag);
if (format != null)
{
try
{
format.connect();
format.format(completeMessageToWrite);
Miscellaneous.logEvent("i", "NFC", "Done writing tag.", 2);
return true;
}
catch(IOException e)
{
Miscellaneous.logEvent("e", "NFC", "Error writing tag: " + Log.getStackTraceString(e), 2);
}
}
}
}
catch(Exception e)
{
Miscellaneous.logEvent("e", "NFC", "Error writing tag: " + Log.getStackTraceString(e), 2);
}
return false;
}
答案 0 :(得分:1)
对不起,本来可以更详细了。看来我有点自己解决了我的问题。我一直在从这个网站上获取一些示例代码,并从该网站获得一些... 这就是为什么在回答这里之前我必须先做一些清理工作。在那个过程中,我发现了一个错误。写函数现在看起来像这样:
public static boolean writeTag(String textToWrite, Tag tag)
{
Miscellaneous.logEvent("i", "NFC", "Attempting to write tag...", 2);
String packageName = Miscellaneous.getAnyContext().getPackageName();
NdefRecord appRecord = NdefRecord.createApplicationRecord(packageName);
// Record with actual data we care about
byte[] textBytes = textToWrite.getBytes();
byte[] textPayload = new byte[textBytes.length + 3];
textPayload[0] = 0x02; // 0x02 = UTF8
textPayload[1] = 'e'; // Language = en
textPayload[2] = 'n';
System.arraycopy(textBytes, 0, textPayload, 3, textBytes.length);
NdefRecord textRecord = new NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_TEXT, new byte[0], textPayload);
// Complete NDEF message with both records
NdefMessage completeMessageToWrite = new NdefMessage(new NdefRecord[] {textRecord, appRecord});
[...]
}
似乎“赞赏”很好,但文本记录不是。