Question

我想格式化Mifare Ultralight C来处理NDEF消息。我已经编写了下面的代码，它可以与Mifare Classic 1K芯片一起工作，但是当我尝试连接到Ultralight C芯片时它会获得IOExeption。

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).show();
        }catch (IOException e) {
            // TODO Auto-generated catch block
            Toast.makeText(getApplicationContext(), "Failed to connect", Toast.LENGTH_SHORT).show();
            e.printStackTrace();

        } catch (FormatException e) {
            // TODO Auto-generated catch block
            Toast.makeText(getApplicationContext(), "Failed Format", Toast.LENGTH_SHORT).show();
            e.printStackTrace();
        }
    }
    else
        Toast.makeText(getApplicationContext(), "Tag unformatable or already formatted to Ndef.", Toast.LENGTH_LONG).show();

}

有谁知道错误可能是什么以及为什么代码适用于1k芯片而不是Ultralight C？标签是全新的，完全空白。

这是logcat中的输出：

    04-21 08:49:27.300: W/System.err(9351): java.io.IOException
04-21 08:49:27.300: W/System.err(9351):     at android.nfc.tech.NdefFormatable.format(NdefFormatable.java:132)
04-21 08:49:27.300: W/System.err(9351):     at android.nfc.tech.NdefFormatable.format(NdefFormatable.java:95)
04-21 08:49:27.300: W/System.err(9351):     at com.example.exjobb.nfc.FormatTag.formatTag(FormatTag.java:69)
04-21 08:49:27.300: W/System.err(9351):     at com.example.exjobb.nfc.FormatTag.onNewIntent(FormatTag.java:58
04-21 08:49:27.300: W/System.err(9351):     at android.app.Instrumentation.callActivityOnNewIntent(Instrumentation.java:1178)
04-21 08:49:27.300: W/System.err(9351):     at android.app.ActivityThread.deliverNewIntents(ActivityThread.java:2418)
04-21 08:49:27.300: W/System.err(9351):     at android.app.ActivityThread.performNewIntents(ActivityThread.java:2431)
04-21 08:49:27.300: W/System.err(9351):     at android.app.ActivityThread.handleNewIntent(ActivityThread.java:2440)
04-21 08:49:27.300: W/System.err(9351):     at android.app.ActivityThread.access$1500(ActivityThread.java:159)
04-21 08:49:27.300: W/System.err(9351):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1387)
04-21 08:49:27.300: W/System.err(9351):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-21 08:49:27.300: W/System.err(9351):     at android.os.Looper.loop(Looper.java:176)
04-21 08:49:27.300: W/System.err(9351):     at android.app.ActivityThread.main(ActivityThread.java:5419)
04-21 08:49:27.300: W/System.err(9351):     at java.lang.reflect.Method.invokeNative(Native Method)
04-21 08:49:27.300: W/System.err(9351):     at java.lang.reflect.Method.invoke(Method.java:525)
04-21 08:49:27.305: W/System.err(9351):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
04-21 08:49:27.305: W/System.err(9351):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
04-21 08:49:27.305: W/System.err(9351):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

我通过向ForegroundDispatch过滤器添加其他过滤器来完成格式化工作。在我只过滤标签发现之前，但在添加技术发现之后，它似乎正在发挥作用。

IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
IntentFilter techDetected = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
IntentFilter[] nfcIntentFilter = new IntentFilter[]{tagDetected,techDetected};

nfcAdapter.enableForegroundDispatch(this, nfcPendingIntent, nfcIntentFilter, null);

不要忘记将新过滤器添加到onNewIntent方法中。

将Mifare Ultralight C格式化为NDEF

1 个答案: