How to run Ubuntu touch apps on Ubuntu desktop?

It's all done with the help of a PPA. All you have to do is to open a terminal and run the following command (you will need to be root):

sudo add-apt-repository ppa:ubuntu-touch-coreapps-drivers/daily
sudo apt-get update
sudo apt-get install touch-coreapps

When the installation finishes, you can find the application in Unity Dash. According to Alan Pope, the apps have been tested on Ubuntu 13.10 and Ubuntu 14.04.

Source: http://linux.softpedia.com/blog/How-to-Test-and-Use-Ubuntu-Touch-Core-Apps-on-the-Ubuntu-Desktop-433742.shtml

There is experimental emulator for ubuntu 14.04, when someone have it it can be installed from repositories:

sudo apt-get update
sudo apt-get install android-emulator
cp -r /usr/share/android/emulator/ ~/
cd ~/emulator/
./build-emulator-sdcard.sh
./run-emulator.sh

For other cases I recommend: https://wiki.ubuntu.com/Touch/Emulator

Hope it helps :)