Appium context switching with multiple apps

Question

I'm automating 2 hybrid apps, using the same driver. I have set apps in appium session capabilities settings like this:

'appium:app': app1path, 
'appium:otherApp': [app2path]

Now I need to do switchContexts() to get webview ob app2. But it only shows context of app1 when I call getContexts(). Any help is appreciated.