The recent EAP of IntelliJ IDEA 10.5 introduces a new presentation of Android platform inside a project.
Previously, you could configure Android SDK inside Android facet settings, while JDK played the role of the main Project/Module SDK. IntelliJ IDEA 10.5 considers Android platform itself as a Project/Module SDK:
Thus, the standard JDK jars aren't included to the classpath of your Android module. So, the IDE will not complete the java classes which are not supported by the Android platform anymore. Also, the usages of such classes will be correctly highlighted as errors:
Note, that in add