在Android上读取原始鼠标数据

Question

在我的Android应用中，我通过USB-OTG 从A 3DConnexion spacenavigator读取值，以控制Ar.drone。

现在我想对鼠标进行同样的操作。但是，Android正在抓住鼠标并呈现鼠标旋转器。当我使用鼠标的供应商和产品ID编写设备过滤器时，我不会像Spacenavigator (strangely, both are HID -- I get no cursor with the SpaceNavigator).

那样获得它

是否有一种方法可以在没有光标的情况下获取原始鼠标数据？

库存Android将是完美的。但是我也考虑为此更改ROM。

Answer 1

您的应用程序声称鼠标（作为主机时的USB HID设备），Android应该隐藏光标，您可以读取原始数据。这应该适用于库存Android，但是您的设备必须支持USB主机模式，并且需要使用USB OTG电缆来连接鼠标。

基本过程：

• 枚举设备
• 要求访问USB设备的权限
• 要求该设备
• 从HID端点读取数据包
• 解析数据包的X和Y位置，按钮点击和滚动轮旋转

对我有用的示例代码（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 ...
}