如果你按照步骤哪里都对，按照教程哪里都对就是死活不出来的时候。看下你的工程编译了吗？看下工作空间中build文件＋里面有没有class文件。如果没有的话 eclipse工具栏中的progect里面有个clean。
build文件夹生成。class文件可能就好了。虽然问题很小，也花了好久才想到了。
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