您好我想使用蓝牙和 NFC 连接两个 android 手机应用程序。
我目前正在通过 NFC 将 UUID 和 MAC 从一台设备发送到另一台设备；问题是在打开套接字时出现以下错误：java.io.IOException：服务发现失败
在应用程序的客户端：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.bluerec);
JSONObject oneObject = null;
//NFC
Intent intent = getIntent();
Parcelable[] messages = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage message = (NdefMessage)messages[0];
NdefRecord record = message.getRecords()[0];
payload = new String(record.getPayload());
String add = null;
String uuid = null;
try {
oneObject = new JSONObject(payload);
add = oneObject.getString("MAC");
uuid = oneObject.getString("UUID");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
TextView textView = (TextView) findViewById(R.id.textView);
textView.setText(payload);
UUID uuid2 = UUID.fromString(uuid);
BluetoothAdapter bluetooth = BluetoothAdapter.getDefaultAdapter();
this.bluetooth = bluetooth;
BluetoothDevice device = bluetooth.getRemoteDevice(add);
connectToServerSocket(device, uuid2 );
}
private void connectToServerSocket(BluetoothDevice device, UUID uuid) {
try{
BluetoothSocket clientSocket = device.createRfcommSocketToServiceRecord(uuid);
// Block until server connection accepted.
clientSocket.connect();
// Start listening for messages.
StringBuilder incoming = new StringBuilder();
listenForMessages(clientSocket, incoming);
// Add a reference to the socket used to send messages.
transferSocket = clientSocket;
} catch (IOException e) {
Log.e("BLUETOOTH", "Blueooth client I/O Exception", e);
}
}
在服务器端：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//Bluetooth
//NFC
jsonObj = getMacAddress();
payload = jsonObj.toString();
nfcAdapter = NfcAdapter.getDefaultAdapter(this);
String mimeType = "application/com.example.cpayvendingcomm";
byte[] mimeBytes = mimeType.getBytes(Charset.forName("US-ASCII"));
NdefMessage nfcMessage = new NdefMessage(
new NdefRecord[]
{
// Create the NFC payload.
new NdefRecord(
NdefRecord.TNF_MIME_MEDIA,
mimeBytes,
new byte[0],
payload.getBytes()),
// Add the AAR (Android Application Record)
//NdefRecord.createApplicationRecord("com.paad.nfcbeam")
});
nfcAdapter.setNdefPushMessage(nfcMessage, this);
initBluetooth();
}
private static final int ENABLE_BLUETOOTH = 1;
private void initBluetooth() {
if (!bluetooth.isEnabled()) {
// Bluetooth isn't enabled, prompt the user to turn it on.
Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, ENABLE_BLUETOOTH);
} else {
// Bluetooth is enabled, initialize the UI.
initBluetoothUI();
BluetoothAdapter bluetooth = BluetoothAdapter.getDefaultAdapter();
this.bluetooth = bluetooth;
startServerSocket(bluetooth);
}
}
private void initBluetoothUI() {
// TODO Auto-generated method stub
}
private ArrayList<BluetoothDevice> deviceList =
new ArrayList<BluetoothDevice>();
BroadcastReceiver discoveryResult = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String remoteDeviceName = intent.getStringExtra(BluetoothDevice.EXTRA_NAME);
BluetoothDevice remoteDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
deviceList.add(remoteDevice);
Log.d(TAG, "Discovered " + remoteDeviceName);
}
};
private BluetoothSocket transferSocket;
private UUID startServerSocket(BluetoothAdapter bluetooth) {
UUID uuid = UUID.fromString("a60f35f0-b93a-11de-8a39-08002009c545");
String name = "bluetoothserver";
try {
final BluetoothServerSocket btserver =
bluetooth.listenUsingRfcommWithServiceRecord(name, uuid);
Thread acceptThread = new Thread(new Runnable() {
public void run() {
try {
// Block until client connection established.
BluetoothSocket serverSocket = btserver.accept();
// Start listening for messages.
StringBuilder incoming = new StringBuilder();
listenForMessages(serverSocket, incoming);
// Add a reference to the socket used to send messages.
transferSocket = serverSocket;
} catch (IOException e) {
Log.e("BLUETOOTH", "Server connection IO Exception", e);
}
}
});
acceptThread.start();
} catch (IOException e) {
Log.e("BLUETOOTH", "Socket listener IO Exception", e);
}
return uuid;
}
// Listener for messages
private boolean listening = false;
private void listenForMessages(BluetoothSocket socket, StringBuilder incoming) {
listening = true;
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
try {
InputStream instream = socket.getInputStream();
int bytesRead = -1;
while (listening) {
bytesRead = instream.read(buffer);
if (bytesRead != -1) {
String result = "";
while ((bytesRead == bufferSize) &&
(buffer[bufferSize-1] != 0)){
result = result + new String(buffer, 0, bytesRead - 1);
bytesRead = instream.read(buffer);
}
result = result + new String(buffer, 0, bytesRead - 1);
incoming.append(result);
}
socket.close();
}
} catch (IOException e) {
Log.e(TAG, "Message received failed.", e);
}
finally {
}
}