为4.0蓝牙传输创建一个socket

Question

我正在开发一个可以将数据传输到 4.0 蓝牙串行设备的 Android 应用。我由 LeGatt android 示例项目 (http://developer.android.com/samples/BluetoothLeGatt/index.html) 指导。在这个项目中，他们连接到设备，但没有传输数据。

对于 2.0 蓝牙，我可以创建一个 Socket、InputStream 和 OutputStream 来传输数据，如下所示：

protected BluetoothSocket mySocket = null;
private InputStream MyInStream;
private OutputStream MyOutStream;
try {
                        Method m = mBluetoothDevice.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
                        tmp = (BluetoothSocket) m.invoke(mBluetoothDevice, Integer.valueOf(1));
                    } catch (Exception e) {
                        textViewLog.append("\n"+"CONNECTION IN THREAD DIDNT WORK");
                    }
                    mySocket = tmp;

                    try {
                        mySocket.connect();
                    } catch (IOException e) {
                        textViewLog.append("\n"+e.getMessage());
                        textViewLog.append("\n"+"CONNECTION IN THREAD DIDNT WORK 2");
                    }  

                    try {
                        MyInStream = mySocket.getInputStream();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

try {
                    MyOutStream = mySocket.getOutputStream();
                } catch (IOException e) {
                    textViewLog.append("\nERROR: "+e.getMessage()); 
                }     

                try {
                    MyOutStream.write((letra+"\r").getBytes()); 
                } catch (IOException e) {
                    textViewLog.append("\nERROR: "+e.getMessage());
                }

但在 4.0 蓝牙中我无法创建 Socket，因为这种方法不起作用

try {
                            Method m = mBluetoothDevice.getClass().getMethod("createRfcommSocket", new Class[] {int.class});
                            tmp = (BluetoothSocket) m.invoke(mBluetoothDevice, Integer.valueOf(1));
                        } catch (Exception e) {
                            textViewLog.append("\n"+"CONNECTION IN THREAD DIDNT WORK");
                        }

谁能帮助我使用我的 4.0 蓝牙设备进行数据传输。

Answer 1

Android BLE 的工作方式与蓝牙堆栈完全不同，请在 Wikipedia 中阅读有关 BLE 的信息。

要使用 BLE 发送数据，您需要将数据放入特征中并使用 gatt 发送！

1st，你需要检查你的BLE设备，哪个特性用于发送数据，以及使用该特性来发送数据！

byte[] data; //Place your data into this array of byte
characteristic.setValue(data); 
gatt.writeCharacteristic(characteristic);

请注意，Android BLE 堆栈有问题，一次只能写一次Characteristics，如下面的链接所述！！

您可以查看这篇关于 Android BLE 的帖子，它将让您清楚地了解 Android BLE 回调的工作原理！

Android BLE, read and write characteristics