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要在Android设备上通过串口发送数据,可以使用Java中的SerialPort类来实现。以下是一个简单的示例代码,演示如何在Android设备上通过串口发送数据:
import android.hardware.usb.UsbDeviceConnection; import android.hardware.usb.UsbManager; import java.io.IOException; import java.io.OutputStream; import java.util.HashMap; public class SerialPortSender { private UsbDeviceConnection connection; private OutputStream outputStream; public SerialPortSender(UsbDeviceConnection connection) { this.connection = connection; this.outputStream = connection.openOutputStream(); } public void sendData(byte[] data) { try { outputStream.write(data); outputStream.flush(); } catch (IOException e) { e.printStackTrace(); } } public static UsbDeviceConnection findSerialPortConnection(UsbManager usbManager) { HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList(); UsbDeviceConnection connection = null; for (UsbDevice device : deviceList.values()) { if (device.getVendorId() == VENDOR_ID && device.getProductId() == PRODUCT_ID) { connection = usbManager.openDevice(device); break; } } return connection; } }
在上面的代码中,SerialPortSender
类负责实现与串口的连接和数据发送功能。sendData
方法用于发送数据,findSerialPortConnection
方法用于查找串口连接。要使用该类,可以在Android应用的主活动中进行调用:
UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE); UsbDeviceConnection connection = SerialPortSender.findSerialPortConnection(usbManager); if (connection != null) { SerialPortSender sender = new SerialPortSender(connection); byte[] data = "Hello, world!".getBytes(); sender.sendData(data); } else { Log.e(TAG, "Cannot find serial port connection"); }
在上面的代码中,首先通过UsbManager
获取USB设备管理器实例,然后通过findSerialPortConnection
方法查找串口连接。如果找到了串口连接,就可以实例化SerialPortSender
类,并通过sendData
方法发送数据。