Android SDK requirements state that either JDK 5 or JDK 6 is required.
However, I have a Java class library written in Java 7 and I would like to use it for my Andro
Do you have the source for the JAR? If so, you can use the javac -target parameter set to either 5 or 6 to generate either Java 5 or 6 class files. See this page.
javac -target