莫名其妙出现这个错误：
[2020-04-14 05:40:51 - Dex Loader] Failed to load D:\adt-bundle-windows-x86_64-20190307\sdk\build-tools\28.0.3\lib\dx.jar [2020-04-14 05:40:51 - Android-CameraFps] Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!
解决办法：
检查build-tools下有几个目录。比如吾有25.0.2和其他。
打开project.properties，然后加上一行：sdk.buildtools=25.0.2
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