Done loading packages.
Preparing to install archives
Downloading SDK Platform Android 8.1.0, API 27, revision 1
Download finished with wrong size. Expected 65606517 bytes, got 65738431 bytes.
Done. Nothing was installed.
实际上本地已经下载好了：
解压：
\android-sdk_r24.4.1-windows\android-sdk-windows\temp\platform-27_r01\android-8.1.0
最后：
剪切 android-8.1.0 文件夹 到 \android-sdk-windows\platforms 目录下，并重命名 android-8.1.0 为 android-27 即可。