在Android中,UsbManager
是用于管理和控制USB设备的类。要设置UsbManager
的参数,您需要执行以下步骤:
- 获取
UsbManager
实例:
UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
- 检查设备是否已连接:
HashMapdeviceList = usbManager.getDeviceList(); Iterator deviceIterator = deviceList.values().iterator(); while (deviceIterator.hasNext()) { UsbDevice device = deviceIterator.next(); if (device.getVendorId() == YOUR_VENDOR_ID && device.getProductId() == YOUR_PRODUCT_ID) { // 设备已连接,可以进行后续操作 } }
- 打开设备:
UsbDeviceConnection connection = usbManager.openDevice(device);
- 设置配置:
UsbInterface intf = device.getInterface(YOUR_INTERFACE_INDEX); UsbEndpoint endpointIn = null; UsbEndpoint endpointOut = null; for (int i = 0; i < intf.getEndpointCount(); i++) { UsbEndpoint endpoint = intf.getEndpoint(i); if (endpoint.getDirection() == UsbConstants.USB_DIR_IN) { endpointIn = endpoint; } else if (endpoint.getDirection() == UsbConstants.USB_DIR_OUT) { endpointOut = endpoint; } } if (endpointIn != null && endpointOut != null) { // 设置配置 connection.claimInterface(intf, true); } else { // 无法设置配置 }
- 设置权限:
在AndroidManifest.xml中添加以下权限:
在代码中检查并请求权限(如果需要):
String deviceName = device.getDeviceName(); UsbDeviceConnection connection = usbManager.openDevice(device); if (connection != null) { HashMapdeviceList = usbManager.getDeviceList(); Iterator deviceIterator = deviceList.values().iterator(); while (deviceIterator.hasNext()) { UsbDevice device = deviceIterator.next(); if (device.getVendorId() == YOUR_VENDOR_ID && device.getProductId() == YOUR_PRODUCT_ID) { PendingIntent permissionIntent = PendingIntent.getBroadcast(this, 0, new Intent("com.example.USB_PERMISSION"), 0); usbManager.requestPermission(device, permissionIntent); break; } } }
在广播接收器中处理权限请求结果:
public class UsbReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (ACTION_USB_PERMISSION.equals(action)) { synchronized (this) { UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE); if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) { if (device != null) { // 权限被授予,可以进行后续操作 } } else { // 权限被拒绝 } } } } }
- 关闭设备连接:
connection.close();
以上示例展示了如何使用UsbManager
设置参数。请注意,您需要根据实际情况替换YOUR_VENDOR_ID
、YOUR_PRODUCT_ID
和YOUR_INTERFACE_INDEX
。