現象： ... java: 1801: method does not override a method from its superclass @Override...
原因： Eclipse is defaulting to Java 1.5 and you have classes implementing interface methods (which in Java 1.6 can be annotated with @Override, but in Java 1.5 can only be applied to methods overriding a superclass method).
解決方案： Go to your project/ide preferences and set the java compiler level to 1.6 and also make sure you select JRE 1.6 to execute your program from eclipse. java的編譯器是1.6版本的，選擇編譯級別為1.6，但重要的一點是，選擇build的android庫是1.5的即可，生成的apk程序是可以在1.5內核上跑起來。
