I used to release an Android app 10ish years ago (before I was banned by Google from releasing Android apps) and this was the case back then. Every time I opened Eclipse it would automatically add the 6MB "support library" to my otherwise 50kB app. There was no way to turn this off, but if you removed it, it would stay removed for that session. Usually I only noticed I'd forgotten when I built the final .apk and went to upload it to the App Store.