title: Android change SDK version in Eclipse? Unable to resolve target android-x
body: <p>I developed an Android aplication against 2.1 SDK. Since then I have re-installed Eclipse/Android SDK; with the new install, I want to 'upgrade' the dependancy of the Android application to 2.2 SDK (because I dont want 2.1 installed on my machine). Is this possible? I am getting the following error from eclipse:</p>
  
  <pre><code>[2010-08-31 18:18:32 - AndroidApplication] Unable to resolve target 'android-7'
  </code></pre>