1. Open Android SDK Manager (e.g. from Eclipse IDE)
2. Open from top menu Android SDK Manager/Settings
3. Check box Force https://...sources to be fetched using http://
<profiles>
<profile>
<id>downloadSources</id>
<properties>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>
</properties>
</profile>
</profiles>
<activeProfiles>
<activeProfile>downloadSources</activeProfile>
</activeProfiles>