我们可以通过代码实现以下步骤来解决Android USB通讯问题:
在AndroidManifest.xml文件中添加以下权限:
在代码中使用UsbManager来查找与USB设备的连接状态,示例代码如下:
UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap deviceList = usbManager.getDeviceList();
Iterator deviceIterator = deviceList.values().iterator();
while (deviceIterator.hasNext()) {
UsbDevice device = deviceIterator.next();
// Do something with the device
}
使用UsbDeviceConnection连接到设备并发送和接收数据,示例代码如下:
UsbDeviceConnection connection = usbManager.openDevice(device);
if (connection != null) {
// Use the deviceConnection to communicate with the device.
UsbEndpoint inEndpoint = device.getInterface(0).getEndpoint(0);
UsbEndpoint outEndpoint = device.getInterface(0).getEndpoint(1);
connection.claimInterface(device.getInterface(0), true);
byte[] dataToSend = "Hello, USB device!".getBytes();
int sentBytes = connection.bulkTransfer(outEndpoint, dataToSend, dataToSend.length, 5000);
if (sentBytes < 0) {
// Handle error
} else {
byte[] receivedData = new byte[4096];
int receivedBytes = connection.bulkTransfer(inEndpoint, receivedData, receivedData.length, 5000);
if (receivedBytes < 0) {
// Handle error
} else {
String receivedMessage = new String(receivedData, 0, receivedBytes);
// Do something with the received data
}
}
connection.releaseInterface(device.getInterface(0));
connection.close();
}