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 8.1：
Android 8.1 是继 Google 推出的 Android 8.0 之后的下一个 Android 版本。此版本中添加了关键用户功能，例如在通过蓝牙连接的设备的快速设置中显示电池电量、不使用时导航按钮变暗、用于关闭和重启的 UI 更新、自动明暗主题和表情符号更新。此版本中引入了关键的开发人员功能，例如用于人工智能的神经网络 API、共享内存 API、壁纸颜色 API、编程安全浏览操作和自动填充框架更新。它的版本名称是Oreo 。 Android 8.1 中的 API 级别为 27。它于 2017 年 12 月 5 日发布。
Android 1.0 和 Android 8.1 的区别：
| S.No. | ANDROID 1.0 | ANDROID 8.1 |
|---|---|---|
| 1. | It is the first version of Android. | It is the next version of Android after Android 8.0. |
| 2. | It is predecessor to Android 1.1. | It is predecessor to Android 9 and successor to Android 8.0. |
| 3. | It was released on 23 September 2008. | It was released on 05 December 2017. |
| 4. | The API level in Android 1.0 version is 1. | The API level in Android 8.1 version is 27. |
| 5. | It has 0 % android market share. | It has 15.4 % 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 ‘Oreo’. |
| 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 and developer features were added in this version. |
| 9. | It did not have UI updates for power off and restart. | UI updates for power off and restart were added in this version. |
| 10. | It did not have automatic light and dark themes. | Automatic light and dark themes were introduced in this version. |
| 11. | It did not have developer features. | Developer features like various APIs were introduced in this version. |