Question

我在Android和Arduino之间找到了蓝牙源我复制并粘贴了它它没有在代码中显示任何错误当我尝试运行它时，它会以消息

结束

"Fatal Error - In onResume() and an exception occureed during write :
socket closde. Check that the SPP
UUID:00001101-0000-1000-8000-00805f9b34fb exists on server"

问题是什么，我该怎么办？

这是源代码：

public class MainActivity extends Activity {
private static final String TAG = "bluetooth1";

Button btnOn, btnOff;

private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;

// SPP UUID service
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

// MAC-address of Bluetooth module (you must edit this line)
private static String address = "00:15:FF:F2:19:5F";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    btnOn = (Button) findViewById(R.id.btnOn);
    btnOff = (Button) findViewById(R.id.btnOff);

    btAdapter = BluetoothAdapter.getDefaultAdapter();
    checkBTState();

    btnOn.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            sendData("1");
            Toast.makeText(getBaseContext(), "Turn on LED", Toast.LENGTH_SHORT).show();
        }
    });

    btnOff.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            sendData("0");
            Toast.makeText(getBaseContext(), "Turn off LED", Toast.LENGTH_SHORT).show();
        }
    });
}

private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
    if(Build.VERSION.SDK_INT >= 10){
        try {
            final Method m = device.getClass().getMethod("createRFCommSocketToServiceRecord", new Class[] { UUID.class });
            return (BluetoothSocket) m.invoke(device, MY_UUID);
        } catch (Exception e) {
            Log.e(TAG, "Could not create Insecure RFComm Connection",e);
        }
    }
    return  device.createRfcommSocketToServiceRecord(MY_UUID);
}

@Override
public void onResume() {
    super.onResume();

    Log.d(TAG, "...onResume - try connect...");

    // Set up a pointer to the remote node using it's address.
    BluetoothDevice device = btAdapter.getRemoteDevice(address);

    // Two things are needed to make a connection:
    //   A MAC address, which we got above.
    //   A Service ID or UUID.  In this case we are using the
    //     UUID for SPP.

    try {
        btSocket = createBluetoothSocket(device);
    } catch (IOException e1) {
        errorExit("Fatal Error", "In onResume() and socket create failed: " + e1.getMessage() + ".");
    }

    // Discovery is resource intensive.  Make sure it isn't going on
    // when you attempt to connect and pass your message.
    btAdapter.cancelDiscovery();

    // Establish the connection.  This will block until it connects.
    Log.d(TAG, "...Connecting...");
    try {
        btSocket.connect();
        Log.d(TAG, "...Connection ok...");
    } catch (IOException e) {
        try {
            btSocket.close();
        } catch (IOException e2) {
            errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
        }
    }

    // Create a data stream so we can talk to server.
    Log.d(TAG, "...Create Socket...");

    try {
        outStream = btSocket.getOutputStream();
    } catch (IOException e) {
        errorExit("Fatal Error", "In onResume() and output stream creation failed:" + e.getMessage() + ".");
    }
}

@Override
public void onPause() {
    super.onPause();

    Log.d(TAG, "...In onPause()...");

    if (outStream != null) {
        try {
            outStream.flush();
        } catch (IOException e) {
            errorExit("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
        }
    }

    try     {
        btSocket.close();
    } catch (IOException e2) {
        errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
    }
}

private void checkBTState() {
    // Check for Bluetooth support and then check to make sure it is turned on
    // Emulator doesn't support Bluetooth and will return null
    if(btAdapter==null) {
        errorExit("Fatal Error", "Bluetooth not support");
    } else {
        if (btAdapter.isEnabled()) {
            Log.d(TAG, "...Bluetooth ON...");
        } else {
            //Prompt user to turn on Bluetooth
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, 1);
        }
    }
}

private void errorExit(String title, String message){
    Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
    finish();
}

private void sendData(String message) {
    byte[] msgBuffer = message.getBytes();

    Log.d(TAG, "...Send data: " + message + "...");

    try {
        outStream.write(msgBuffer);
    } catch (IOException e) {
        String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
        if (address.equals("00:00:00:00:00:00"))
            msg = msg + ".\n\nUpdate your server address from 00:00:00:00:00:00 to the correct address on line 35 in the java code";
        msg = msg +  ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";

        errorExit("Fatal Error", msg);
    }
}
}

Answer 1

这是一个糟糕的代码，您不应该使用它 - 来自Google的一个很好的示例 - BluetoothChatService：https://github.com/googlesamples/android-BluetoothChat。请参阅BluuetoothChatService类。不幸的是，它存在问题 - 它使用Handler与应用程序的其余部分进行通信。我稍微更改它以便将消息发布到另一个HandlerThread并且该线程通知用户设置的自定义界面（对于我的Arduino项目），有关更多详细信息，请参阅此项目：https://github.com/AlexShutov/LEDLights

蓝牙应用程序不起作用

1 个答案: