在Android 11上读取USB OTG(On-The-Go)的方法如下:
<uses-permission android:name="android.permission.USB_PERMISSION" />
private static final String ACTION_USB_PERMISSION = "com.example.USB_PERMISSION";
private UsbManager usbManager;
private PendingIntent permissionIntent;
// 初始化USBManager和permissionIntent
usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
permissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
// 检测已连接的USB设备
HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();
Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
while (deviceIterator.hasNext()) {
UsbDevice device = deviceIterator.next();
// 请求USB权限
usbManager.requestPermission(device, permissionIntent);
}
private final BroadcastReceiver usbReceiver = new BroadcastReceiver() {
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) {
// 已获得USB权限,可以进行读取操作
// 在这里执行您的读取USB操作
}
} else {
// 未获得USB权限
}
}
}
}
};
// 注册广播接收器
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
registerReceiver(usbReceiver, filter);
UsbDeviceConnection connection = usbManager.openDevice(device);
UsbInterface usbInterface = device.getInterface(0);
UsbEndpoint endpoint = usbInterface.getEndpoint(0);
connection.claimInterface(usbInterface, true);
byte[] buffer = new byte[endpoint.getMaxPacketSize()];
int bytesRead = connection.bulkTransfer(endpoint, buffer, buffer.length, TIMEOUT);
// 处理读取到的数据
请注意,以上代码仅为示例,实际操作可能因设备类型和协议而有所不同。您可能需要根据您连接的具体USB设备进行适当的调整。
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