从 BroadcastReceiver 获得 USB 设备许可的问题？答案

【问题标题】：Issue with getting USB device permission from BroadcastReceiver?从 BroadcastReceiver 获得 USB 设备许可的问题？
【发布时间】：2022-10-19 16:25:25
【问题描述】：

我正在使用下面的代码在检测到它时从用户那里获取 USB 访问权限，但它从未在 android 11 中被检测到。任何帮助将不胜感激

public final String ACTION_USB_PERMISSION = "com.domain.ftd.USB_PERMISSION";

private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { 
        @Override
        public void onReceive(Context context, Intent intent) {


            if (intent.getAction().equals(ACTION_USB_PERMISSION)) {
                boolean granted = intent.getExtras().getBoolean(UsbManager.EXTRA_PERMISSION_GRANTED);
                Log.e("usb started","really");
                if (granted) {
                     //DO SOMETHING 
                }
         }

     @Override
        protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
             usbManager = (UsbManager) getSystemService(this.USB_SERVICE);
            IntentFilter filter = new IntentFilter();
            filter.addAction(ACTION_USB_PERMISSION);
            filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
            filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
            registerReceiver(broadcastReceiver, filter);
    
    
    
    
        }

【问题讨论】：

标签： java broadcastreceiver android-usb

【解决方案1】：

您需要调用 requestPermission() 方法来显示一个对话框，询问用户是否允许连接到设备，请参考official doc 并搜索关键字“requestPermission()”

【讨论】：