简单的NFC code不工作？ [英] Simple NFC Code not working?

问题描述

我想找到一个开始编写使用NFC的应用程序。我只需要一部手机发送NDEF消息到另一个只包含一个简单的字符串。

I am trying to find a start writing an app using NFC. I simply need to send a NDef Message from one phone to another containing only a simple String.

我的发送活动：

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，我只是试着得到一些意图在手机的其他的东西happend：

Then I simply try to receive some Intent on the other phone that something happend:

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();
            }

        }

}

可悲的是没有任何反应，如果我一敲电话。感谢您的帮助！

Sadly nothing happens if I tap the phones. Thanks for any help!

推荐答案

在其网站上。你应该总是查找文档中的第一个。

On Their website. You should always look up in the documentation first.

本文档介绍了Android中执行基本的NFC任务。它   解释如何发送和接收的NFC数据在NDEF消息的形式   并介绍了支持这些功能的Andr​​oid框架的API。   对于更高级的主题，包括有工作的讨论   非NDEF数据，请参见高级NFC。

This document describes the basic NFC tasks you perform in Android. It explains how to send and receive NFC data in the form of NDEF messages and describes the Android framework APIs that support these features. For more advanced topics, including a discussion of working with non-NDEF data, see Advanced NFC.

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