How to open an app from my app?

If you would like to open any app from your app then you can use openURL method. You can check out this doc link and sample code

• https://gist.github.com/MotiurRahman/2d2c0579e497bee91cc912e6cc96a57e
•  http://docs.appcelerator.com/platform/latest/#!/api/Titanium.Platform-method-openURL

Hope this helps.