Please check your android sdk is properly installed or not .
according to your comments above it seems that you have not installed the platform for android-7 .
you can check that by below command.
C:\Program Files\Android>android list targets
this should give you all installed platforms to your android sdk.
But when i config "configuration":"Release", i don't know where it save my apk file
dont use the configuration as release for development purpose.
Its used only when you want to release your app for end users. BTW if you keep your configuration as release then it asks for the password which you should have configured at the time of creation of certificate.
So if i want to release app. How i config package.json.
and more, although i config :
, android emulator support both portrait and landscape
"orientations": [ "portrait"
use the following configuration.
This is configuration for your application. `Debug` should always be used unless you are submitting your app to an online store - in which case `Release` should be specified.
i am not sure about the orientation being used here.
I really appreciate you taking the time to put all this useful information together, thanks dustfinger!