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:
UsbManager
实例:UsbManager usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
Iterator<UsbDevice> 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
}
}
UsbDeviceConnection connection = usbManager.openDevice(device);
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
}
在AndroidManifest.xml中添加以下权限:
<uses-feature android:name="android.hardware.usb.host" />
<uses-permission android:name="android.permission.USB_PERMISSION" />
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) {
HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
Iterator<UsbDevice> 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
}
}
}
}
}
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
。