官网上找不到Android Studio 3.0下载，

此处有预览版下载的，可以直接根据你的系统点击对应的超链接进行下载

Windows (64-bit): android-studio-ide-171.4010489-windows.zip (702075896 bytes)

b1f983c68b7c1f9a7442b132b774fe01489acfd6cd4d0a72a07cbef441682727

Windows (32-bit): android-studio-ide-171.4010489-windows32.zip (701541040 bytes)

5d7101353eee3d0bc201be01afca6e40d2643bb3ae5e99ec94e0cc0400698de0

Mac: android-studio-ide-171.4010489-mac.zip (701134644 bytes)

863849c56ea4ac1d788e8a5c30cb7bf88b80f552fcc72c4cef24c016e148a3b8

Linux: android-studio-ide-171.4010489-linux.zip (700534332 bytes)

7eeade7638b8a2d2715539e27e521a75be274e5b690b1a90e69e938f42a75988

64位：

https://dl.google.com/dl/android/studio/ide-zips/3.0.0.0/android-studio-ide-171.4010489-windows.zip

32位：

https://dl.google.com/dl/android/studio/ide-zips/3.0.0.0/android-studio-ide-171.4010489-windows32.zip​

https://developer.android.com/studio/preview/index.html

以上