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 计数、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 2.1：
Android 2.1 是继 Google 推出的 Android 2.0.1 之后的下一个 Android 版本。它具有以前版本的所有功能，并且在此版本中还添加了一些新功能。此版本与之前的 Android 2.0 和 Android 2.0.1 版本非常相似。此版本中没有添加任何主要功能。仅更新了用户界面。这个版本有一个版本名称。它的版本名称是Eclair 。 Android 2.1 中的 API 级别为 7。它于 2010 年 1 月 12 日发布。
Android 1.0 和 Android 2.1 的区别：
| S.No. | ANDROID 1.0 | ANDROID 2.1 |
|---|---|---|
| 1. | It is the first version of Android. | It is the next version of Android after Android 2.0.1. |
| 2. | It is predecessor to Android 1.1. | It is predecessor to Android 2.2 and successor to Android 2.0.1. |
| 3. | It was released on 23 September 2008. | It was released on 12 January 2010. |
| 4. | The API level in Android 1.0 version is 1. | The API level in Android 2.1 version is 7. |
| 5. | It is not used anymore in mobile devices. | It is also not used anymore. |
| 6. | It does not have official version name. | It has official version name like its previous version. |
| 7. | It has unofficial version name ‘Apple pie’. | It has official version name ‘Eclair’. |
| 8. | It had limited features like google maps, gmail, web browser, camera and youtube. | It had all the features of Android 2.0 and Android 2.0.1 but some new features were added in this version. |
| 9. | It did not have good user interface. | It had updated user interface than its previous versions. |