通过蓝牙在android中从树莓派接收数据

Question

我正在创建一个Android应用程序，使用它我将通过蓝牙连接到树莓派。 我能够发送数据到Raspberry Pi的问题，并且它在终端上可见（我在Android中使用OutputStream发送数据），但无论Raspberry pi发送什么，我都无法在我的InputStream中获取它。

我已阅读有关使用listenrfcomm来获取其他设备发送的数据，但同时使用createrfcomm，我也输入以及输出流。我很困惑什么使用和如何使用。

注意：使用createrfcomm我能够成功地将数据发送到Raspberry pi。只有来自Rasperry pi的数据接收才是剩余的部分。

请相应通知。

Answer 1

它会更容易与您的代码明确回答，但我发现API指南例如有用虽然略显杂乱起初：

具有螺纹连接：

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) { } 
    } 

}

和一个线程来监听和完成工作：

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) { } 
    } 

}

我认为，如果你可以发送你有BluetoothDevice类和BluetoothAdapter已经，并且可以创建并运行连接线程

mConnectThread = new ConnectThread(bluetoothAdapter.getRemoteDevice(deviceAddress)); 
mConnectThread.start(); 

在这个例子中字节的数据读取，被发送到UI线程与mHandler.obtainMessage。这行可以编辑，以适应你想要处理的数据。

例子来自http://developer.android.com/guide/topics/connectivity/bluetooth.html