Android layout design for many menu options
<p>What is the best way to go about designing an Android application that features quite a bit of formulas and conversions?  I was thinking that multiple Activities with ListViews sort of like a tree with the leaves being the actual calculations.  However, after reading Android design principles it's better to avoid a pure navigational structure and try to reduce the deepness of the app.</p>

<p>For example:</p>

<pre><code>Main Menu
  Conversions
    Weight
    Distance
  Distance - Speed - Time
    Calculate air speed
    Calculate distance traveled
  Weather
    METAR
    TAF
</code></pre>

<p>So by the 3rd or 4th screen we've reached the actual individual calculator.  Does this make sense?  And if it does, is there a better way of designing this (maybe using action bars or tabs)?</p>
