How to launch already installed App on Android 4.4.2 device

Support
1

I have Installed app on this device using Appium drivers based on C# in visual studio. but unable to lookback on the device home screeen from that point of code , so please suggest how to launch a App if it is installed already .

I really killed so much of time in finding .

Thanks in advance,
sri

2

I will use these capabilities when I’m not installing the app again:

    capabilities = {
        platformName:      :android,
        deviceName:        '',
        platformVersion:   '4.4.4',
        androidPackage:    'com.vacationrentals.homeaway',
        appActivity:       'com.vacationrentals.homeaway.activities.SplashActivity',
        newCommandTimeout: 0,
        autoWebview:       true,
    }

And when I do want to install the app I add this in the capabilities:

        app:               '/my/local/path.apk',