Hi!
I'm reposting this from android-platform, as there was no response. Perhaps
someone here knows how to fix this?
I have a system app (signed with platform keys), and this app is injecting
events. It is using uinput and tries to use /dev/input/eventN (where N is a
number) as well.
If I run the code as root (i.e. with su), the code can obviously open
/dev/input/eventN and can inject events in there. If the code is run from
the system app, I get permission denied when opening /dev/input/eventN with
open("/dev/input/event1", O_RDWR). Uinput works fine, however, even in
system app.
The permissions requested by the system app are:
<uses-permission android:name="android.permission.READ_FRAME_BUFFER"
tools:ignore="ProtectedPermissions"/>
<uses-permission android:name="android.permission.ACCESS_SURFACE_FLINGER"
tools:ignore="ProtectedPermissions"/>
<uses-permission android:name="android.permission.INJECT_EVENTS"
tools:ignore="ProtectedPermissions"/>
<uses-permission android:name="android.permission.BIND_INPUT_METHOD"
tools:ignore="ProtectedPermissions"/>
For what it's worth, this system app also reads screen (using screencap
binary), and is able to do so. So it is very strange it is not able to open
with r/w /dev/input/eventN.
You might wonder what's wrong with uinput if that works. The problem with
uinput is that I have problems injecting touch events. Specifically, I can
not "click" (tap).
I can drag, swipe, inject keyboard events, but clicking (tapping) just does
not work. It seems as if it is stuck with long press. It does not register
the final event, where ABS_MT_TRACKING_ID is set to 0xffffffff.
The code I'm using for "click" (tap) is:
// pointer down
send_event(EV_ABS, ABS_MT_SLOT, 0);
send_event(EV_ABS, ABS_MT_TRACKING_ID,
m_tracking_id++ % 65535);
send_event(EV_ABS, ABS_MT_TOOL_TYPE, MT_TOOL_PEN);
// pointer coordinates
send_event(EV_ABS, ABS_MT_POSITION_X, x);
send_event(EV_ABS, ABS_MT_POSITION_Y, y);
send_event(EV_ABS, ABS_MT_TOUCH_MAJOR, m_tracking_id % 2 ? 0x3c : 0x30);
send_event(EV_ABS, ABS_MT_PRESSURE, m_tracking_id % 2 ? 20 : 25);
send_event(EV_SYN, SYN_REPORT);
// pointer up
send_event(EV_ABS, ABS_MT_TRACKING_ID, -1);
send_event(EV_SYN, SYN_REPORT);
Any help or pointers greatly appreaciated.
Regards,
Miha.
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