If you look at this Gingerbread code:
// See if this is a keyboard. Ignore everything in the button
range except for
// gamepads which are also considered keyboards.
if (containsNonZeroByte(key_bitmask, 0,
sizeof_bit_array(BTN_MISC))
|| containsNonZeroByte(key_bitmask,
sizeof_bit_array(BTN_GAMEPAD),
sizeof_bit_array(BTN_DIGI))
|| containsNonZeroByte(key_bitmask,
sizeof_bit_array(KEY_OK),
sizeof_bit_array(KEY_MAX + 1))) {
device->classes |= INPUT_DEVICE_CLASS_KEYBOARD;
device->keyBitmask = new uint8_t[sizeof(key_bitmask)];
if (device->keyBitmask != NULL) {
memcpy(device->keyBitmask, key_bitmask,
sizeof(key_bitmask));
} else {
delete device;
LOGE("out of memory allocating key bitmask");
return -1;
}
}
}
// See if this is a trackball (or mouse).
if (test_bit(BTN_MOUSE, key_bitmask)) {
uint8_t rel_bitmask[sizeof_bit_array(REL_MAX + 1)];
memset(rel_bitmask, 0, sizeof(rel_bitmask));
LOGV("Getting relative controllers...");
if (ioctl(fd, EVIOCGBIT(EV_REL, sizeof(rel_bitmask)),
rel_bitmask) >= 0) {
if (test_bit(REL_X, rel_bitmask) && test_bit(REL_Y,
rel_bitmask)) {
device->classes |= INPUT_DEVICE_CLASS_TRACKBALL;
}
}
}
// See if this is a touch pad.
uint8_t abs_bitmask[sizeof_bit_array(ABS_MAX + 1)];
memset(abs_bitmask, 0, sizeof(abs_bitmask));
LOGV("Getting absolute controllers...");
if (ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(abs_bitmask)), abs_bitmask)
>= 0) {
// Is this a new modern multi-touch driver?
if (test_bit(ABS_MT_POSITION_X, abs_bitmask)
&& test_bit(ABS_MT_POSITION_Y, abs_bitmask)) {
device->classes |= INPUT_DEVICE_CLASS_TOUCHSCREEN |
INPUT_DEVICE_CLASS_TOUCHSCREEN_MT;
// Is this an old style single-touch driver?
} else if (test_bit(BTN_TOUCH, key_bitmask)
&& test_bit(ABS_X, abs_bitmask) && test_bit(ABS_Y,
abs_bitmask)) {
device->classes |= INPUT_DEVICE_CLASS_TOUCHSCREEN;
}
}
we know that support for the joystick is not expected.
In Honeycomb and in Ice Cream Sandwich the support for Joystick is
present,
but even if we have not yet the source code, from sdk 14, we find that
there are no devices that can function as a mouse, keyboard and
joystick together. mouse and joystick are exclusive.
I would like to inform Android developers that there are virtual
devices that can have all these functions together. For example, an
android device that can function as a multifunctional remote control.
I think this thing is very important, make happy the android community
and try to implement the support for these types of devices.
thanks.
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