1. Android 1.0：
Android 1.0是Google推出的第一个Android版本。它具有一些基本功能，包括Web浏览器支持，相机支持，Gmail帐户，Google地图和Youtube应用程序。尽管它没有正式的版本名称(如进一步介绍的版本)，但非官方地将其称为Apple Pie 。 Android 1.0版本中的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. Android 8.1：
Android 8.1是Google推出的继Android 8.0之后的下一个Android版本。此版本中添加了关键的用户功能，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，墙纸颜色API，程序化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之间的区别：
| 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. |
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