blockevent for Android

The "Android" name is a trademark of Google LLC.

blockevent runs on the user space similarly to getevent tool. Offers 2 appliable concepts for input devices.

Grabs exclusive input handle with using EVIOCGRAB control for input devices in the /dev/input/ to block input_event flow to Android Platform's EventHub. (Block concept)

Then releases the devices when specified input_event is received from any device(Stop trigger concept) or SIGINT signal sent by its terminal.(Ctrl+C)

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Can be used:

• To keep using devices that has faulty touch screen(especially ghost touch), buttons or headphone jack without modifying the kernel or disassembly any hardware.

• For the applications needing to temporarily block of touch screen such as video players, child locks, drawing tracers, ebook readers.

• For the applications needing to permanently block of touch screen like turning device into display.

Usage

Usage: ./blockevent -d device... [-s trigger] [-v level] [-r x1,y1,x2,y2...] [-R ] [-W width] [-H height]
    -d: blocking device. Preset device id or a path specified device.
        Preset devices (0=Touchscreen, 1=Volume Down, 2=Volume Up, 3=Power Button)
        Specific device (/dev/input/eventX)

    -s: stop trigger.Preset device or a device specified event.
        Preset devices (0=Area Button, 1=Volume Down, 2=Volume Up, 3=Power Button)
        Specific event (/dev/input/eventX:<Type>,<Code>,<Value>)

    -v: verbosity level.(Errors=1, None=2, All=4) (Default=1)
    -r: rectangle.Comma seperated left bottom and right top corner point coordinates.
        -d 0 -s (1-3) -r x1,y1,x2,y2 : specifies partly blocking rectangle on the touchscreen.
        -d 0 -r x1,y1,x2,y2 -s 0 -r x1,y1,x2,y2 : specifies partly blocking.
        -d (1-3) -s 0 -r x1,y1,x2,y2 : specifies area button's rectangle.

    -R: reverse. Reverses blocking rectangle on the touchscreen.
    -W: screen width.
    -H: screen height.
    -h: print help.

Get your executable binary from Releases or build yourself then follow the commands.

Running on device :

su # tsu for Termux
cp blockevent_* /data/local/tmp/
chmod +x /data/local/tmp/blockevent_*
./data/local/tmp/blockevent_*

Running with adb :

adb push blockevent_* /data/local/tmp/
adb shell su -c "chmod +x /data/local/tmp/blockevent_*"
adb shell su -c /data/local/tmp/blockevent_*

Block touch screen :

> ./data/local/tmp/blockevent_* -d 0

Block left half of the touch screen:

> ./data/local/tmp/blockevent_* -d 0 -r 0,2400,540,0 -W 1080 -H 2400

Block touch screen and stop blocking when volume down button is pressed:

> ./data/local/tmp/blockevent_* -d 0 -s 1

Block touch screen and stop blocking when rectangle area is double tapped.

> ./data/local/tmp/blockevent_* -d 0 -s 0 -r 400,1100,750,800 -W 1080 -H 2400

Block other devices :

> getevent -lp
add device 3: /dev/input/event6
  name:     "atoll-wcd937x-snd-card Headset Jack"
  [...]

> ./data/local/tmp/blockevent_* -d /dev/input/event6

Build

Target	ABI
android_arm	armeabi-v7a
android_arm64	arm64-v8a
android_x86	x86
android_x86_64	x86_64

There is a script provided to build application for all the targets. Make sure you download NDK and install Bazel then follow the commands.

Using the release.sh script:

> export ANDROID_NDK_HOME=/YOUR/NDK/PATH
> ./release.sh

4 build completed successfully (Total: 4)
releases/blockevent_arm: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /system/bin/linker, with debug_info, not stripped
[...]

Build for the specific target:

bazel build //src:blockevent --config=TARGET

TODO

This section will be removed after version 1.x.x

• Add specific event trigger option to stop blocking
• Add touch device classifier to able to block touchscreen without getting device from the user.
• Add option to block multiple devices at the same time.
• Add installation script
• Add option to block only specific part of touchscreen
• Add custom stop triggers.
• [Done for touchscreen] Change device blocking behavior to event blocking behavior. Some devices has a single device for volume and power button events. New behavior will provide a filtered blocking mechanism.