麻烦写一段蓝牙轮询检索波特率的代码
时间: 2023-07-10 13:04:01 浏览: 47
以下是一个简单的蓝牙轮询检索波特率的代码示例,使用了Android的Bluetooth API:
```java
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import java.io.IOException;
import java.util.UUID;
public class BluetoothPortScanner {
private final UUID SERIAL_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); // SPP service UUID
private BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
public int getBaudRate(BluetoothDevice device) {
int[] baudRatesToTry = new int[] {9600, 19200, 38400, 57600, 115200};
BluetoothSocket socket = null;
for (int baudRate : baudRatesToTry) {
try {
socket = device.createRfcommSocketToServiceRecord(SERIAL_UUID);
socket.connect();
socket.getOutputStream().write("AT\r\n".getBytes()); // Send an AT command to test the connection
Thread.sleep(100); // Wait for the response
byte[] buffer = new byte[256];
int bytesRead = socket.getInputStream().read(buffer);
String response = new String(buffer, 0, bytesRead);
if (response.contains("OK")) {
return baudRate; // The connection was successful at this baud rate
}
} catch (IOException | InterruptedException e) {
// Failed to connect at this baud rate
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// Ignore
}
}
}
}
return -1; // Failed to connect at any baud rate
}
}
```
这个类中的 `getBaudRate` 方法接受一个 `BluetoothDevice` 对象作为参数,并返回成功连接到设备时使用的波特率。它使用了一个整数数组 `baudRatesToTry` 来存储要尝试的波特率,然后在循环中尝试连接每个波特率。如果连接成功,则返回该波特率;如果所有波特率都失败,则返回 -1。