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Orangutan is intended as replacement for Android's monkey/monkeyrunner tool, intended to overcome the following limitations:

  • Lack of ability to realistically simulate input events: it is difficult to impossible to accurately simulate touch events in terms of downtime and event time. The TCP/IP protocol does not currently set the down time for events correctly, which can result in swipes being misinterpreted as long presses. Running a monkey script these values are set automatically, but not in a way that all applications can understand: for example, Google Chrome for Android totally ignores a monkey-generated drag event.
  • Difficult to impossible to fix bugs. Theoretically it may be possible to submit patches upstream, but good luck getting a patched version of monkeyrunner on a device running Android 2.x.

Instead of hooking into Android's java-based windowing/event system like Monkey, Orangutan takes a different approach: injecting events directly into the kernel /dev/input system. From the point of view of the Android system, this is totally indistinguishable from actual touch events. Parameters such as the duration of a press, speed of the swipe, etc. are inferred at run time by the Android system.

An additional advantage of Orangutan is that it should run/work on any system which provides the /dev/input interface. This means that it should be possible to use Orangutan on Mozilla's B2G operating system (which reuses much of Android's kernel and userspace functionality).


Building / Installing

Assuming you have installed the Android NDK, you can configure and build Orangutan by running:

./configure $PATH_TO_ANDROID_NDK

For example, on my machine I downloaded and extracted the NDK to $HOME/opt/android-ndk-r6. So In my case I would run:

./configure $HOME/opt/android-ndk-r6

To install on your device (assuming it's connected via USB and developer mode is enabled), run:

make push

If you want to use Orangutan with Eideticker, you'll need to install it in /system/xbin. Since this directory is normally readonly, you'll need to remount it. This can usually be done using something resembling the following procedure (assuming you already have a copy in /data):

adb shell su -c 'mount -o remount,rw /dev/block/mmcblk0p1 /system'
adb shell su -c 'cp /data/orng /system/xbin/orng'

Exact instructions may vary depending on the phone you're working with and its partition layout.

Kernel support

Orangutan comes with a Linux kernel module that lets you emulate arbitrary input devices. The use of the module is optional.

A guide on how to build kernel modules for binary-only kernels is available at

The resulting binary module is named 'orng.ko' and resides in the subdirectory 'kernel/'. To copy the binary module to your device, execute

adb push kernel/orng.ko /system/orng/orng.ko

and load the module with

adb shell insmod /system/orng/orng.ko <module parameter>

Module parameters are either

'names' - an comma-separated list of up tp 16 device names, or
'bustype', 'vendor', 'product', and 'version' - a device id.

Names take precedence over device ids.


Orangutan currently just executes "script" files containing a sequence of gestures. Currently the following are supported:

  • Drag: Simulates a drag (panning) gesture. Syntax:

    drag [start x] [start y] [end x] [end y] [num steps] [duration in msec]

  • Tap: Simulates a sequence of taps. Syntax:

    tap [x] [y] [num times]

  • Sleep: Sleeps for a specified period of time. Syntax:

    sleep [duration in msec]

An example script file which fairly simulates a double tap, then a pan gesture, then a sleep for two seconds on a Galaxy Nexus in landscape mode might be:

tap 175 630 2
drag 200 200 600 200 10 100
sleep 2000

To execute a script file, simply copy it onto the device, and run orng utility against it as follows.

/system/xbin/orng [device name] [script file]

The device name varies per device, you can generally figure it out by running "getevent" on the device and seeing what device corresponds to the touch screen. On the Galaxy Nexus

For example, if your script file was '/mnt/sdcard/script' and you were running on a Galaxy Nexus, you would run the following command from an adb shell:

/system/xbin/orng /dev/input/event1 /mnt/sdcard/script
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