代码修改后是否需重新生成Signed APK用于Google Play上传？

Absolutely! You must generate a new signed APK after modifying your app's code—here's why it's non-negotiable:

• The original signed APK only contains your app's code and resources before the changes. Uploading it would mean users still get the old version, making your code updates completely useless.
• Google Play requires all uploaded app packages (APKs or App Bundles) to be signed with your registered developer key. This signature acts as proof of your app's identity and integrity. After modifying code, re-packaging and re-signing ensures the new bundle is tied to your developer account, which is mandatory for Google Play to accept the update.
• If you try to upload a modified but unsigned (or incorrectly signed) APK, Google Play will immediately reject it. The platform's security checks rely on valid signatures to prevent tampered or untrusted apps from being distributed.

Quick Tip #

Make sure to use the same keystore file (.jks or .keystore) that you used for the original signed APK. Switching to a new key will cause Google Play to treat the upload as a completely new app, and you won't be able to update your existing listing.

内容的提问来源于stack exchange，提问作者Brinda Rathod