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 addition to the Android SDK, you still need a Java SDK because IntelliJ IDEA uses it for compilation. You’ll be prompted for it while creating a new Android SDK.
It is important to mention that once you open an existing Android project in IntelliJ IDEA 10.5 it will be converted automatically, no manual configuration needed.
You are welcome to try it in the latest IntelliJ IDEA 10.5 EAP build and let us know what you think.