1. Android 1.1：
Android 1.1是Google继Android 1.0之后推出的第二个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一些其他功能。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。此版本中还添加了用于保存MMS附件的功能。它也没有像Android 1.0这样的正式版本名称，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. Android 3.1：
Android 3.1是Google推出的继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RTP音频API。此版本未添加任何新的开发人员功能。它的版本名称是Honeycomb 。 Android 3.1中的API级别为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. |
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