android - 在android上读取原始鼠标数据

Question

在我的 Android 应用程序中，我通过 USB-OTG 从 3DConnexion SpaceNavigator 读取值来控制 AR.Drone .

现在我想用鼠标做同样的事情。然而，Android 正在抓取鼠标并呈现鼠标光标。当我使用鼠标的供应商和产品 ID 编写设备过滤器时，我并没有像 SpaceNavigator 那样得到它(奇怪的是，两者都是 HID —— SpaceNavigator 没有光标)。

有没有办法在没有光标的情况下获取原始鼠标数据？

将与股票 Android 完美结合。但我也会考虑为此更改 ROM。

Answer 1

一旦您的应用程序声明了鼠标(作为主机时的 USB HID 设备)，Android 应该隐藏光标并且您可以读取原始数据。这应该适用于股票 android，但您的设备必须支持 USB 主机模式，并且需要 USB OTG 电缆来连接鼠标。

基本流程:

• 枚举设备
• 请求访问 USB 设备的权限
• 认领设备
• 从 HID 端点读取数据包
• 从数据包中解析 X 和 Y 位置、按钮点击和滚轮旋转

适用于我的示例代码(Android 5.0):

UsbManager usbManager;
UsbDevice usbDevice;

private void connect() {
    this.usbManager = (UsbManager) context.getSystemService(Context.USB_SERVICE);
    HashMap<String, UsbDevice> deviceList = usbManager.getDeviceList();

    // just get the first enumerated USB device
    Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
    if (deviceIterator.hasNext()) {
        this.usbDevice = deviceIterator.next();
    }

    if (usbDevice == null) {
        Log.w(TAG, "no USB device found");
        return;
    }

    // ask for permission

    final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
    final BroadcastReceiver mUsbReceiver = 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){
                            // call method to set up device communication
                            Log.i(TAG, "permission granted. access mouse.");

                            // repeat in a different thread
                            transfer(device);
                        }
                    }
                    else {
                        Log.d(TAG, "permission denied for device " + device);
                    }
                }
            } else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
                UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
                if (device != null) {
                    // TODO:
                    // call your method that cleans up and closes communication with the device
                    // usbInterface.releaseInterface();
                    // usbDeviceConnection.close();
                }
            }
        }
    };

    PendingIntent mPermissionIntent = PendingIntent.getBroadcast(context, 0, new Intent(ACTION_USB_PERMISSION), 0);
    IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
    context.registerReceiver(mUsbReceiver, filter);

    usbManager.requestPermission(usbDevice, mPermissionIntent);
}

private void transfer(UsbDevice device) {

    int TIMEOUT = 0;
    boolean forceClaim = true;

    // just grab the first endpoint
    UsbInterface intf = device.getInterface(0);
    UsbEndpoint endpoint = intf.getEndpoint(0);
    UsbDeviceConnection connection = this.usbManager.openDevice(device);
    connection.claimInterface(intf, forceClaim);

    byte[] bytes = new byte[endpoint.getMaxPacketSize()];

    connection.bulkTransfer(endpoint, bytes, bytes.length, TIMEOUT);

    // depending on mouse firmware and vendor the information you're looking for may
    // be in a different order or position. For some logitech devices the following 
    // is true:

    int x = (int) bytes[1];
    int y = (int) bytes[2];
    int scrollwheel = (int) bytes[3]

    // call a listener, process your data ...
}