解决Failed to load D:\Android-Studio\sdk\build-tools\26.0.1\lib\dx.jar

问题：升级了sdk之后运行出错，Failed to load D:\Android-Studio\sdk\build-tools\26.0.1\lib\dx.jar

Unable to build: the file dx.jar was not loaded from the SDK folder

网上找了半天照着解决，结果都不成功，最后硬着头皮看英文最后解决了，记录一下。

第一种办法:

• Delete "26.0.0" in "build-tools" directory
• Use "25.0.2" instead
• Restart eclipse

第二种办法:

• add this in the project.properties of your project:
  sdk.buildtools=25.0.2

复制过来的 就不翻译了。