android: Fix typo.

Change-Id: Ie2a321f1d8461d9fa665be11a8e5085c24ad032b
android: Simplify the About dialog creation.

Change-Id: I40fb007e8f672e1c5ff4e6e23c043b7305e726a9
android: Fix the application lifecycle.

Now onStart() loads the file, and onStop() closes it again.  Fixes the case
when the user leaves the app by pressing Home, and starts it again;
previously, this caused a race.

Change-Id: I493a76eaf5e8ca8a68b53f70c7acd09b638f7e11