Error:java.lang.NullPointerException (no error message)
2017-08-08 16:39
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今天遇到一个问题，电脑突然关机了，然后重启电脑打开Android studio时，运行程序跑不起来，然后报Error:java.lang.NullPointerException (no error message)，同时Java文件找不到R文件。首先尝试clear和rebuild无效。最后在网上找到如下解决方法：
删除工程目录下.gradle文件夹，重启Android Studio就OK了，删除.gradle文件，不是删除Build.gradle文件。
删除工程目录下.gradle文件夹，重启Android Studio就OK了，删除.gradle文件，不是删除Build.gradle文件。
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