Display a toast with message, for longer if is_long

Property definitions

android :: toast $ App :: toast
	# Display a _toast_ with `message`, for longer if `is_long`
	fun toast(message: String, is_long: Bool)
	do
		var jstr = message.to_java_string
		native_toast(jstr, is_long, native_activity)
		jstr.delete_local_ref
	end
lib/android/toast.nit:27,2--33,4