Unknown error: java.lang.NullPointerException.

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编译工程的时候遇到RT错误，诡异的是之前都是好的，我就改了改makefile和lib工程的文件

最后找到了方法

I was getting the error when I created a new Android project from source in eclipse and it stumped me for a bit until I took a look at the .project file. For some reason even after I updated the library links, the old links were not removed. This is what was causing the Unknown error: java.lang.NullPointerException.

This should cause the workspace to be re-built and the .project file will get corrected.To fix it close Eclipse and edit your .project file and remove the <linkResources> section and ALL of the links inside. Then go back into eclipse re-setup the links and do a clean (Project->Clean in the menu) on the affected project.

Happy Developing!

把 .project 下面的 <linkResource>标签删掉，clean再build就对了