>>297
レスありがとうございます

https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels
↑この辺を今読んでたんですが
「 In a very small number of cases, parts of the API may be modified or removed, although typically
such changes are only needed to ensure API robustness and application or system security.」
うーんやっぱりそういうのもあるのか、って感じです