android R.java居然报错，Underscores can only be used with source level 1.7 or greater
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第一次碰到R.java居然报错，，什么要我用JDK1.7的，，
我就改了，然后一想我没有JDK1.7啊
于是又报错，然后说是一个以数字开头的变量的问题，我不可能以数字开头啊，一顿怪人家R.java。。sorry啊。。。
后来一想是刚刚下了几个图片，一看果真！！！有个图片叫什么20143467387438_easyicon.png,不能乱放啊
哼！！！害死我了。。我还没用到这个icon呢，原来放进去就有问题了，恩，怪不得drawable里面放多了图片就开始eclipse没事就卡，还得把不用的删掉去，，
恩，只要把数字开头的图片删了就好了，图片也会直接在R.JAVA里面算资源的，谨记啊！！！没用的也统统删掉！！！
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