In the uinput_user_dev structure, you need to set absmax for the axises you
enabled, otherwise android will see that (max - min) == 0 and will consider
the axis unusable. (cf. EventHub.cpp EventHub::getAbsoluteAxisInfo)
Le samedi 5 octobre 2013 02:03:41 UTC+8, Andre Rodrigues a écrit :
>
> Hello everyone.
>
> I am starting to develop a system wide assistive tecnhology. To do so i
> trying to control all the input.
>
> So far i am able to block all the events from the touchscreen while
> monitoring them. I am also able to inject events when it is unblocked.
>
> My goal is to is create a virtual touchscreen (using uinput) so i can
> forward the events from the blocked one while adjusting them.
>
> The problem i face is that even though i am able to create the device i
> get the message
> " Touch device 'uinput-eve' did not report support for X or Y axis!Thedevice
> will be inoperable
> ."
>
> This is the way i am creating the device:
>
> struct uinput_user_dev uidev;struct input_event ev;int dx, dy;
> int fd;
> fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK);if (fd < 0) {
> die("error: open");}
>
> memset(&uidev, 0, sizeof(uidev));
> snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "uinput-eve");
> uidev.id.bustype = BUS_VIRTUAL;
> uidev.id.vendor = 0x1;
> uidev.id.product = 0x1;
> uidev.id.version = 1;
> if (write(fd, &uidev, sizeof(uidev)) < 0) {
> die("error: write");}
> /* touch screen event */
> ioctl(fd, UI_SET_EVBIT, EV_ABS);
> ioctl(fd, UI_SET_ABSBIT, ABS_X);
> ioctl(fd, UI_SET_ABSBIT, ABS_Y);
> ioctl(fd, UI_SET_EVBIT, EV_KEY);
> ioctl(fd, UI_SET_KEYBIT, BTN_TOUCH);
>
> if (ioctl(fd, UI_DEV_CREATE,0) < 0) {
> die("error: ioctl");}
>
> I dug a little and it seems the problem is this validation that happens in
> services/input/InputReader.cpp
>
> // Ensure we have valid X and Y axes.if (!mRawPointerAxes.x.valid ||
> !mRawPointerAxes.y.valid) {
> LOGW(INDENT "Touch device '%s' did not report support for X or Y axis! "
> "The device will be inoperable.", getDeviceName().string());
> mDeviceMode = DEVICE_MODE_DISABLED;
> return;
>
> }
>
> The problem is that i have no idea how to solve this.
> It is my first time working with native Android and any help would be
> deeply appreciated.
>
> Thank you for your time.
>
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