Ok, I'll show you 2 different ways:
1- Using the Phone library
Dim in As Intent
Dim pm As PackageManager
in = pm.GetApplicationIntent("com.ebay.mobile")
If in.IsInitialized Then
StartActivity(in)
Else
Msgbox("eBay app not installed", "")
End If
2- Using an Intent
Dim Intent1 As Intent
Try
Intent1.Initialize(Intent1.ACTION_MAIN, "")
Intent1.SetComponent("com.ebay.mobile/.activities.eBay")
StartActivity(Intent1)
Catch
Msgbox("eBay app not installed", "")
End Try
To get the Intent, you have to check the unfiltered logs (you have a tab in the IDE labeled LOGS, click there, then UNCHECK the Filter check box and click on CONNECT), then read the logs and search for the intent.