我正在尝试连接蓝牙设备并想向该设备发送数据，并且还想从该设备接收数据。
为了实现这一点，我遵循android developer bluetooth document但似乎我无法连接另一台设备，因为在连接时它会引发以下异常。
09-13 13:27:56.913: I/BluetoothConnect(2980): Connect exception:-java.io.IOException: [JSR82] connect: Connection is not created (failed or aborted).
我遵循的步骤。
启用蓝牙
Intent turnOnIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(turnOnIntent, REQUEST_ENABLE_BT);获取蓝牙配对设备
Set<BluetoothDevice> bondSet = myBluetoothAdapter.getBondedDevices(); ArrayList<HashMap<String, String>> bondedhDevicesList = new ArrayList<HashMap<String, String>>(); for (Iterator<BluetoothDevice> it = bondSet.iterator(); it.hasNext();) { BluetoothDevice bluetoothDevice = (BluetoothDevice) it.next(); HashMap<String, String> map = new HashMap<String, String>(); map.put("name", bluetoothDevice.getName()); map.put("address", bluetoothDevice.getAddress()); bondedhDevicesList.add(map); }获取设备的 UUID
bluetoothDevice = myBluetoothAdapter.getRemoteDevice(address); // min api 15 !!! Method m; try { m = bluetoothDevice.getClass(). getMethod("fetchUuidsWithSdp", (Class[]) null); m.invoke(bluetoothDevice, (Object[]) null ); } catch (NoSuchMethodException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) { // TODO Auto-generated catch block e.printStackTrace(); }连接到设备
private static final UUID MY_UUID = UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
public ConnectThread(BluetoothDevice device, String uuid, BluetoothAdapter mBluetoothAdapter) {
// Use a temporary object that is later assigned to mmSocket,
// because mmSocket is final
BluetoothSocket tmp = null;
this.mBluetoothAdapter = mBluetoothAdapter;
mmDevice = device;
Method m;
try {
mBluetoothAdapter.cancelDiscovery();
mmSocket = device.createInsecureRfcommSocketToServiceRecord(MY_UUID);
m = device.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class});
mmSocket = (BluetoothSocket) m.invoke(device, 1);
} catch (IOException | IllegalArgumentException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
// TODO Auto-generated catch block
Log.i("BluetoothConnect", e.toString());
e.printStackTrace();
}
//mBluetoothAdapter.cancelDiscovery();
//socket.connect();
}
public void run() {
// Cancel discovery because it will slow down the connection
mBluetoothAdapter.cancelDiscovery();
try {
// Connect the device through the socket. This will block
// until it succeeds or throws an exception
mmSocket.connect();
Constants.globalSocket = mmSocket;
} catch (IOException connectException) {
// Unable to connect; close the socket and get out
Log.i("BluetoothConnect", "Connect exception:-"+connectException.toString());
try {
mmSocket.close();
} catch (IOException closeException) {
Log.i("BluetoothConnect", "close exception:-"+closeException.toString());
}
return;
}
}
但是在连接时，我得到了那个例外。
5. 写入设备。
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[1024]; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI activity
CreatePacket.mHandler.obtainMessage(MESSAGE_READ , bytes, -1, buffer)
.sendToTarget();
} catch (IOException e) {
Log.i("ConnectedThread", "while receiving data:-"+e.toString());
break;
}
}
}
public void write(byte[] bytes) {
Log.i("ConnectedThread", "data while writing:-"+bytes.toString());
try {
mmOutStream.write(bytes);
} catch (IOException e) {
Log.i("ConnectedThread", "while writing data to bluetooth:-"+e.toString());
}
}
如果我仍然尝试写入数据，那么我会收到以下异常。
请给我任何提示或参考。
09-13 13:48:55.079: I/ConnectedThread(2980): while writing data to bluetooth:-java.io.IOException: socket closed
从过去三天开始，我一直坚持这一点，但仍然没有得到任何解决方案。