Refactor updateTimerText()
Round minutes off evenly, not down
Add one to seconds display

When there's exactly one second remaining, display 1, not 0.
Multiply the hit-test scale by the pixel density

In SDK level 4 and later, getX() and getY() are no longer auto-scaled to
a common resolution, so we have to divide pixel-based values such as the
radius by the pixel density.
AndroidManifest.xml:  Add <uses-sdk> element

Set minSdkVersion to 4 to avoid implicitly asserting phone state and USB
storage access permissions.  Set targetSdkVersion to 14 to avoid showing
the legacy overflow button on Android 4.0 and higher.