Question

我试图连接android和arduino并在它们之间发送数据。我正在遵循指南http://developer.android.com/guide/topics/connectivity/bluetooth.html#ManagingAConnection

我想我隐约明白这是如何运作的，但我并没有完全掌握基础知识，所以我有点卡住了。

我正在查看＆＃34;作为客户端连接的代码＆＃34;：

private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;

public ConnectThread(BluetoothDevice device) {
    // Use a temporary object that is later assigned to mmSocket,
    // because mmSocket is final
    BluetoothSocket tmp = null;
    mmDevice = device;

    // Get a BluetoothSocket to connect with the given BluetoothDevice
    try {
        // MY_UUID is the app's UUID string, also used by the server code
        tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
    } catch (IOException e) { }
    mmSocket = tmp;
}

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();
    } catch (IOException connectException) {
        // Unable to connect; close the socket and get out
        try {
            mmSocket.close();
        } catch (IOException closeException) { }
        return;
    }

    // Do work to manage the connection (in a separate thread)
    manageConnectedSocket(mmSocket);
}

/** Will cancel an in-progress connection, and close the socket */
public void cancel() {
    try {
        mmSocket.close();
    } catch (IOException e) { }
}
}

和＆＃34;管理连接＆＃34;

private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;

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
            mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
                    .sendToTarget();
        } catch (IOException e) {
            break;
        }
    }
}

/* Call this from the main activity to send data to the remote device */
public void write(byte[] bytes) {
    try {
        mmOutStream.write(bytes);
    } catch (IOException e) { }
}

/* Call this from the main activity to shutdown the connection */
public void cancel() {
    try {
        mmSocket.close();
    } catch (IOException e) { }
}
}

我基本上复制了确切的代码并制作了包含它们的新java文件。我想实际使用这些类来发送数据，所以我配对了设备，然后找到了ID：

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
    if (pairedDevices.size() > 0) 
    {
        // Loop through paired devices
        for (BluetoothDevice device : pairedDevices) 
        {
            if (device.getName().equals("HC-06"))
            {
                //NEED TO INSERT CODE HERE (I think...)             
            }
            else
            {
                Intent intentneedsetting = new Intent(this, NeedSettingsActivity.class);       
                startActivity(intentneedsetting);
            }
        }
    }
    else
    {
        Intent intentneedsetting = new Intent(this, NeedSettingsActivity.class);       
        startActivity(intentneedsetting);
    }

非常感谢有关如何使用这些类（ConnectThread / ConnectedThread）的任何帮助！

Answer 1

我不确定你是什么意思，什么不是，但我会试着解释一下这些课程的目的..

ConnectThread - 接收在发现阶段发现的蓝牙设备（显然在连接之前）从设备获取BT套接字，当调用run（）时，它尝试连接到它。如果连接成功 - 在代码中它只是说manageConnectedSocket(mmSocket);但这意味着你应该打开ConnectedThread来通过套接字接收和发送数据。

如上所述，

ConnectedThread -是管理发送和接收数据的线程。正如你在run()中看到的那样，它经常使用while(true)监听它调用阻塞的读取 - 意味着“线程卡在那里”，直到它接收到传入的数据。当收到数据时，它使用mHandler处理它，这也没有在这里实现，你应该再次实现你想要对收到的数据做什么。 write方法只接收一个字节数组并将其写入套接字，请注意，这也是一个阻塞调用，因此你应该从另一个线程使用它。

希望这有助于你理解

如何使用类 - 蓝牙线程

1 个答案: