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 9：
Android 9是Google推出的继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的用户功能，例如，整个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过渡，更新了音量滑块，带有屏幕截图按钮的电源选项和生物特征认证。其版本名称为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之间的区别：
| 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. |
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