Question

我正在尝试使用NFC开始编写应用程序。我只需要从一部手机发送NDef消息到另一部手机只包含一个简单的字符串。

我的传输活动：

public class MainActivity extends Activity {

    NfcAdapter mNfcAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
        if (mNfcAdapter == null) {
            Toast.makeText(this, "NFC is not available", Toast.LENGTH_LONG).show();
            finish();
            return;
        }
        NdefMessage msg = new NdefMessage(
                new NdefRecord[] { createTextRecord("Bla", Locale.GERMANY , true )});
        mNfcAdapter.setNdefPushMessage(msg, this);
    }



    public NdefRecord createTextRecord(String payload, Locale locale, boolean encodeInUtf8) {
        byte[] langBytes = locale.getLanguage().getBytes(Charset.forName("US-ASCII"));
        Charset utfEncoding = encodeInUtf8 ? Charset.forName("UTF-8") : Charset.forName("UTF-16");
        byte[] textBytes = payload.getBytes(utfEncoding);
        int utfBit = encodeInUtf8 ? 0 : (1 << 7);
        char status = (char) (utfBit + langBytes.length);
        byte[] data = new byte[1 + langBytes.length + textBytes.length];
        data[0] = (byte) status;
        System.arraycopy(langBytes, 0, data, 1, langBytes.length);
        System.arraycopy(textBytes, 0, data, 1 + langBytes.length, textBytes.length);
        NdefRecord record = new NdefRecord(NdefRecord.TNF_WELL_KNOWN,
        NdefRecord.RTD_TEXT, new byte[0], data);
        return record;
    }
   }

然后我只是尝试在另一部手机上收到一些意图发生的意图：

public class MainActivity extends Activity {

    NfcAdapter mNfcAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
        if (mNfcAdapter == null) {
            Toast.makeText(this, "NFC is not available", Toast.LENGTH_LONG).show();
            finish();
            return;
        }
    }


    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();

            if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) {
                Toast.makeText(getApplicationContext(), "Received an Event onResume", Toast.LENGTH_LONG).show();
            }

        }

}

可悲的是，如果我点按手机就没有任何反应。谢谢你的帮助！

Answer 1

On Their website。您应该首先查看文档。

本文档介绍了您在Android中执行的基本NFC任务。它解释了如何以NDEF消息的形式发送和接收NFC数据并描述了支持这些功能的Android框架API。有关更高级的主题，包括使用的讨论非NDEF数据，请参阅高级NFC。

简单的NFC代码不起作用？

1 个答案: