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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