android sdk and level

sdk.txt

.--------------------.---------------.---------------------.
|     Code name      |    Version    |      API level      |
:--------------------+---------------+---------------------:
| (no code name)     | 1.0           | API level 1         |
:--------------------+---------------+---------------------:
| (no code name)     | 1.1           | API level 2         |
:--------------------+---------------+---------------------:
| Cupcake            | 1.5           | API level 3, NDK 1  |
:--------------------+---------------+---------------------:
| Donut              | 1.6           | API level 4, NDK 2  |
:--------------------+---------------+---------------------:
| Eclair             | 2.0           | API level 5         |
:--------------------+---------------+---------------------:
| Eclair             | 2.0.1         | API level 6         |
:--------------------+---------------+---------------------:
| Eclair             | 2.1           | API level 7, NDK 3  |
:--------------------+---------------+---------------------:
| Froyo              | 2.2.x         | API level 8, NDK 4  |
:--------------------+---------------+---------------------:
| Gingerbread        | 2.3 - 2.3.2   | API level 9, NDK 5  |
:--------------------+---------------+---------------------:
| Gingerbread        | 2.3.3 - 2.3.7 | API level 10        |
:--------------------+---------------+---------------------:
| Honeycomb          | 3.0           | API level 11        |
:--------------------+---------------+---------------------:
| Honeycomb          | 3.1           | API level 12, NDK 6 |
:--------------------+---------------+---------------------:
| Honeycomb          | 3.2.x         | API level 13        |
:--------------------+---------------+---------------------:
| Ice Cream Sandwich | 4.0.1 - 4.0.2 | API level 14, NDK 7 |
:--------------------+---------------+---------------------:
| Ice Cream Sandwich | 4.0.3 - 4.0.4 | API level 15, NDK 8 |
:--------------------+---------------+---------------------:
| Jelly Bean         | 4.1.x         | API level 16        |
:--------------------+---------------+---------------------:
| Jelly Bean         | 4.2.x         | API level 17        |
:--------------------+---------------+---------------------:
| Jelly Bean         | 4.3.x         | API level 18        |
:--------------------+---------------+---------------------:
| KitKat             | 4.4 - 4.4.4   | API level 19        |
:--------------------+---------------+---------------------:
| KitKat Watch       | 4.4W          | API level 20        |
:--------------------+---------------+---------------------:
| Lollipop           | 5.0           | API level 21        |
:--------------------+---------------+---------------------:
| Lollipop           | 5.1           | API level 22        |
:--------------------+---------------+---------------------:
| Marshmallow        | 6.0           | API level 23        |
'--------------------'---------------'---------------------'

https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels