SanityTests is a hodgepodge of things to test various interactions, such as SQLite use, JNI use, P/Invoke use, SSL, compression, and all manner of other things.
This sample is not a "HOWTO" guide for how to 'properly' (sanely) do something; it's our internal "test suite" (ha!) "thrown over the wall" as it answers frequently recurring questions on the mailing list, such as how to use Android.Runtime.JNIEnv, Java integration, and more.
Ideally such things will be split out into separate, easily digestible samples in the future (presumably as part of ApiDemo), but in the interest of expediency...