re Requirements</h3>

<p>Some feature constants listed in the tables above were made available to
applications <em>after</em> the corresponding API; for example, the
<code>android.hardware.bluetooth</code> feature was added in Android 2.2 (API
level 8), but the bluetooth API that it refers to was added in Android 2.0 (API
level 5). Because of this, some apps were able to use the API before they had
the ability to declare that they require the API via the
<code>&lt;uses-feature&gt;</code> system. </p>

<p>To