1. 安卓 1.1：
Android 1.1 是继Android 1.0 之后Google 推出的第二个Android 版本。它具有以前版本(即 Android 1.0)中包含的所有功能，并且在此版本中还添加了更多功能。在呼叫者应用程序中添加了一些功能，例如隐藏和显示数字键盘。此版本还增加了保存彩信附件的功能。它也没有像 Android 1.0 那样的正式版本名称，但非正式地称为Banana Bread 。 Android 1.1 中的 API 级别为 2。它于 2009 年 2 月 9 日发布。
2. 安卓 3.1：
Android 3.1 是继 Google 推出的 Android 3.0 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。此版本中引入了新的用户功能，例如 UI 改进、开放式附件 API、USB 主机 API、操纵杆和游戏手柄支持、MTP 通知和音频的 RTP API。此版本中未添加新的开发人员功能。它的版本名称是Honeycomb 。 Android 3.1 中的 API 级别是 12。它于 2011 年 5 月 10 日发布。
Android 1.1 和 Android 3.1 之间的区别：
| S.No. | ANDROID 1.1 | ANDROID 3.1 |
|---|---|---|
| 1. | It is the second version of Android. | It is the next version of Android after Android 3.0. |
| 2. | It is successor to Android 1.0 version. | It is successor to Android 3.0 version. |
| 3. | It is predecessor to Android 1.5 version. | It is predecessor to Android 3.2 version. |
| 4. | It was released on 09 February 2009. | It was released on 10 May 2011. |
| 5. | The API level in Android 1.1 version is 2. | The API level in Android 3.1 version is 12. |
| 6. | It does not have official version name like its successors. | It has official version name like its other previous versions. |
| 7. | It has unofficial version name ‘Banana Bread’. | It has official version name ‘Honeycomb’. |
| 8. | It had all the features of previous version and two more features were added in this version. | It had all features of previous versions and some new features were added in this version. |
| 9. | It did not support joysticks and gamepads. | Features like joysticks and gamepads support were added in this version. |
| 10. | It had simple user interface. | Improved user interface was introduced in this version. |
| 11. | It did not have open accessory API and USB host API. | Open accessory API and USB host API were added in this version. |