| page.title=Permitted Version Strings for Android 2.1 | 
 | @jd:body | 
 |  | 
 | <p>As described in Section 3.2.2 of the <a href="/compatibility/android-2.1-cdd.pdf">Android 2.1 Compatibility Definition</a>,  | 
 | only certain strings are allowable for the system property | 
 | <code>android.os.Build.VERSION.RELEASE</code>. The reason for this is that | 
 | applications and web sites may rely on predictable values for this string, and | 
 | so that end users can easily and reliably identify the version of Android | 
 | running on their devices.</p> | 
 | <p>Because subsequent releases of the Android software may revise this string, | 
 | but not change any API behavior, such releases may not be accompanied by a new | 
 | Compatibility Definition Document. This page lists the versions that are | 
 | allowable by an Android 2.1-based system. The only permitted values for | 
 | <code>android.os.Build.VERSION.RELEASE</code> for Android 2.1 are:</p> | 
 | <ul> | 
 | <li> | 
 | <p>2.1</p> | 
 | </li> | 
 | <li> | 
 | <p>2.1-update1</p> | 
 | </li> | 
 | </ul> |