记录一下android各个版本对应的代号和API等级，方便以后查找
| 系统版本 | 代号 | API等级 |
|---|---|---|
| Android 13.0 | T | 33 |
| Android 12.0 | S | 31，32 |
| Android 11.0 | R | 30 |
| Android 10.0 | Q | 29 |
| Android 9.0 | Pie | 28 |
| Android 8.1 | Oreo | 27 |
| Android 8.0 | Oreo | 26 |
| Android 7.1.1 | Nougat | 25 |
| Android 7.0 | Nougat | 24 |
| Android 6.0 | Marshmallow | 23 |
| Android 5.1 | Lollipop | 22 |
| Android 5.0 | Lollipop | 21 |
| Android 4.4W | KitKat Wear | 20 |
| Android 4.4 | KitKat | 19 |
| Android 4.3 | Jelly Bean | 18 |
| Android 4.2 | Jelly Bean | 17 |
| Android 4.1 | Jelly Bean | 16 |
| Android 4.0.3 | IceCreamSandwich | 15 |
| Android 4.0 | IceCreamSandwich | 14 |
| Android 3.2 | Honeycomb | 13 |
| Android 3.1 | Honeycomb | 12 |
| Android 3.0 | Honeycomb | 11 |
| Android 2.3.3 | Gingerbread | 10 |
| Android 2.3 | Gingerbread | 9 |
| Android 2.2 | Froyo | 8 |
| Android 2.1 | Eclair | 7 |