Question

我正在向微控制器发送NDEF消息。写入和读取仅适用于一次写入/读取（但不能同时进行）。它类似于：Write NDEF message multiple times to same tag?，但没有帮助。

我的代码是：

new Thread(new Runnable() {
            @Override
            public void run() {
    Ndef ndef = Ndef.get(detectedTag);
            try {
                ndef.connect();
            } catch (IOException e) {
                Log.e("connect", "Connection error");
                e.printStackTrace();
            }
            try {
                ndef.writeNdefMessage(getNdefMessage("Hey"));
                Log.e("write", "write ok");
            } catch (Exception e) {
                Log.e("write", "error write "+e.getMessage());
            }
            try {
                ndef.writeNdefMessage(getNdefMessage("Hey"));
                Log.e("write", "write ok");
            } catch (Exception e) {
                Log.e("write", "error write "+e.getMessage());
            }
            try {
                ndef.writeNdefMessage(getNdefMessage("Hey"));
                Log.e("write", "write ok");
            } catch (Exception e) {
                Log.e("write", "error write "+e.getMessage());
            }
            try {
                ndef.writeNdefMessage(getNdefMessage("Hey"));
                Log.e("write", "write ok");
            } catch (Exception e) {
                Log.e("write", "error write "+e.getMessage());
            }

            finally {
                try {
                    ndef.close();
                } catch (IOException e) {
                    Log.e("write", "ndef close");
                }
            }
 }
        }).start();

如果我想写4次，第一次就可以了，之后最后3次是错误。 logcat的：

08-27 10:11:45.029  12850-12850/com.example.me.testnfc E/write﹕ write ok
08-27 10:11:45.299  12850-12850/com.example.me.testnfc E/write﹕ error write Tag is not ndef
08-27 10:11:45.379  12850-12850/com.example.me.testnfc E/write﹕ error write Tag is not ndef
08-27 10:11:45.459  12850-12850/com.example.me.testnfc E/write﹕ error write Tag is not ndef

用writeNdefMessage()替换getNdefMessage()以便阅读它有用......

logcat的：

08-27 10:25:26.584  24701-24701/com.example.me.testnfc E/Read﹕ Read ok
08-27 10:25:26.646  24701-24701/com.example.me.testnfc E/Read﹕ Read ok
08-27 10:25:26.709  24701-24701/com.example.me.testnfc E/Read﹕ Read ok
08-27 10:25:26.783  24701-24701/com.example.me.testnfc E/Read﹕ Read ok

编辑：每次写入后添加Thread.sleep(2000)，Log.e("Detected TAG", detectedTag.toString())中添加onNewIntent() logcat的：

08-27 10:50:57.988  15948-15948/com.example.me.testnfc E/Detected TAG﹕ TAG: Tech [android.nfc.tech.IsoDep, android.nfc.tech.NfcA, android.nfc.tech.Ndef]
08-27 10:51:00.461  15948-16128/com.example.me.testnfc E/write﹕ write ok
08-27 10:51:02.221  15948-15948/com.example.me.testnfc E/Detected TAG﹕ TAG: Tech [android.nfc.tech.IsoDep, android.nfc.tech.NfcA, android.nfc.tech.Ndef]
08-27 10:51:02.533  15948-16128/com.example.me.testnfc E/write﹕ write ok
08-27 10:51:04.312  15948-15948/com.example.me.testnfc E/Detected TAG﹕ TAG: Tech [android.nfc.tech.IsoDep, android.nfc.tech.NfcA, android.nfc.tech.Ndef]
08-27 10:51:04.620  15948-16128/com.example.me.testnfc E/write﹕ write ok
08-27 10:51:06.405  15948-15948/com.example.me.testnfc E/Detected TAG﹕ TAG: Tech [android.nfc.tech.IsoDep, android.nfc.tech.NfcA, android.nfc.tech.Ndef]
08-27 10:51:06.692  15948-16128/com.example.me.testnfc E/write﹕ write ok
08-27 10:51:08.480  15948-15948/com.example.me.testnfc E/Detected TAG﹕ TAG: Tech [android.nfc.tech.IsoDep, android.nfc.tech.NfcA, android.nfc.tech.Ndef]

多次写入/读取NDEF消息到标记

0 个答案: