1. 安卓 1.0：
Android 1.0 是 Google 推出的第一个 Android 版本。它有一些基本功能，包括网络浏览器支持、相机支持、Gmail 帐户、谷歌地图和 Youtube 应用程序。虽然它没有像进一步介绍版本那样的正式版本名称，但非正式地称为Apple Pie 。 Android 1.0 版本的 API 级别为 1。在移动设备中不再使用它。它于2008年9月23日发布。
2.安卓9：
Android 9 是继 Google 推出的 Android 8.1 之后的下一个 Android 版本。它具有以前版本的所有功能，并且在此版本中添加了一些关键的用户功能。此版本中添加了关键用户功能，例如 UI 上的圆角、快速设置菜单更改、通知栏、在应用程序之间切换时的新转换、更新的音量滑块、带有屏幕截图按钮的电源选项和生物识别身份验证。它的版本名称是Pie 。 Android 9 中的 API 级别为 28。它于 2018 年 8 月 9 日发布。
Android 1.0 和 Android 9 的区别：
| S.No. | ANDROID 1.0 | ANDROID 9 |
|---|---|---|
| 1. | It is the first version of Android. | It is the next version of Android after Android 8.1. |
| 2. | It is predecessor to Android 1.1. | It is predecessor to Android 10 and successor to Android 8.1. |
| 3. | It was released on 23 September 2008. | It was released on 09 August 2018. |
| 4. | The API level in Android 1.0 version is 1. | The API level in Android 9 version is 28. |
| 5. | It has 0 % android market share. | It has 10.4 % android market share. |
| 6. | It does not have official version name. | It has official version name like its other previous versions. |
| 7. | It has unofficial version name ‘Apple Pie’. | It has official version name ‘Pie’. |
| 8. | It had limited basic features like google maps, gmail, web browser, camera and youtube. | It had all features of previous versions and some new user features were added in this version. |
| 9. | It did not have UI updates for various functionalities. | UI updates for notification bar and volume slider button were added in this version. |
| 10. | It did not have biometric authentication. | Biometric authentication was introduced in this version. |