This article from: http://www.cnblogs.com/yaotong/archive/2011/01/25/1943615.html
If the download is slow or cannot be downloaded, there are three ways to fix it
1. Patience.
2. Use P2SP download tools, such as Thunder, Baidu Cloud offline.
3. You know.
Cannot upgrade online please see below
sudo vi/etc/hosts
Add to
74.125.206.93 dl-ssl.google.com
2014.7
ADT Bundle
Http://dl.google.com/android/adt/adt-bundle-windows-x86-20140702.zip
Http://dl.google.com/android/adt/adt-bundle-windows-x86_64-20140702.zip
Http://dl.google.com/android/adt/adt-bundle-mac-x86_64-20140702.zip
Http://dl.google.com/android/adt/adt-bundle-linux-x86-20140702.zip
Http://dl.google.com/android/adt/adt-bundle-linux-x86_64-20140702.zip
SDK Tools only
Http://dl.google.com/android/android-sdk_r23.0.2-windows.zip
Http://dl.google.com/android/installer_r23.0.2-windows.exe
Http://dl.google.com/android/android-sdk_r23.0.2-macosx.zip
Http://dl.google.com/android/android-sdk_r23.0.2-linux.tgz
Android Studio
Http://dl.google.com/android/studio/install/0.8.6/android-studio-bundle-135.1339820-windows.exe
Http://dl.google.com/android/studio/install/0.8.6/android-studio-bundle-135.1339820-mac.dmg
Http://dl.google.com/android/studio/install/0.8.6/android-studio-bundle-135.1339820-linux.tgz
Android NDK
Http://dl.google.com/android/ndk/android-ndk32-r10-windows-x86.zip
http://dl.google.com/ Android/ndk/android-ndk32-r10-windows-x86_64.zip
http://dl.google.com/android/ndk/ ANDROID-NDK32-R10-DARWIN-X86.TAR.BZ2
http://dl.google.com/android/ndk/android-ndk32-r10-darwin-x86_64. tar.bz2
http://dl.google.com/android/ndk/android-ndk32-r10-linux-x86.tar.bz2
http://dl.google.com/ ANDROID/NDK/ANDROID-NDK32-R10-LINUX-X86_64.TAR.BZ2
http://dl.google.com/android/ndk/ Android-ndk64-r10-windows-x86.zip
Http://dl.google.com/android/ndk/android-ndk64-r10-windows-x86_64.zip
HTTP://DL.GOOGLE.COM/ANDROID/NDK/ANDROID-NDK64-R10-DARWIN-X86.TAR.BZ2
http://dl.google.com/android/ndk/ ANDROID-NDK64-R10-DARWIN-X86_64.TAR.BZ2
http://dl.google.com/android/ndk/ ANDROID-NDK64-R10-LINUX-X86.TAR.BZ2
http://dl.google.com/android/ndk/android-ndk64-r10-linux-x86_64.tar.bz2
Http://dl.google.com/android/ndk/android-ndk-r10-cxx-stl-libs-with-debug-info.zip
2014.6
Android Studio 0.8
Http://dl.google.com/android/studio/install/0.8.0/android-studio-bundle-135.1245622-windows.exe
Http://dl.google.com/android/studio/install/0.8.0/android-studio-bundle-135.1245622-mac.dmg
Http://dl.google.com/android/studio/install/0.8.0/android-studio-bundle-135.1245622-linux.tgz
Android SDK only R23
Http://dl.google.com/android/android-sdk_r23-windows.zip
Http://dl.google.com/android/installer_r23-windows.exe
Http://dl.google.com/android/android-sdk_r23-macosx.zip
Http://dl.google.com/android/android-sdk_r23-linux.tgz
ADT Bundle R23
Http://dl.google.com/android/adt/adt-bundle-linux-x86_64-20140624.zip
Http://dl.google.com/android/adt/adt-bundle-linux-x86-20140624.zip
Http://dl.google.com/android/adt/adt-bundle-windows-x86-20140624.zip
Http://dl.google.com/android/adt/adt-bundle-windows-x86-20140624.zip
Http://dl.google.com/android/adt/adt-bundle-mac-x86_64-20140624.zip
Android NDK r9d
Http://dl.google.com/android/ndk/android-ndk-r9d-windows-x86.zip
Http://dl.google.com/android/ndk/android-ndk-r9d-windows-x86_64.zip
http://dl.google.com/android/ndk/android-ndk-r9d-darwin-x86.tar.bz2
http://dl.google.com/android/ndk/android-ndk-r9d-linux-x86.tar.bz2
http://dl.google.com/android/ndk/android-ndk-r9d-linux-x86_64.tar.bz2
Http://dl.google.com/android/ndk/android-ndk-r9d-cxx-stl-libs-with-debug-info.zip
Android NDK r6b
Windows
Http://dl.google.com/android/ndk/android-ndk-r6b-windows.zip
Mac OS X (Intel)
http://dl.google.com/android/ndk/android-ndk-r6b-darwin-x86.tar.bz2
Linux
http://dl.google.com/android/ndk/android-ndk-r6b-linux-x86.tar.bz2
Android SDK 3.2
Windows
Http://dl.google.com/android/android-sdk_r12-windows.zip
Http://dl.google.com/android/installer_r12-windows.exe
Mac OS X (Intel)
Http://dl.google.com/android/android-sdk_r12-mac_x86.zip
Linux (i386)
Http://dl.google.com/android/android-sdk_r12-linux_x86.tgz
Android NDK R6
Windows
Http://dl.google.com/android/ndk/android-ndk-r6-windows.zip
Mac OS X (Intel)
http://dl.google.com/android/ndk/android-ndk-r6-darwin-x86.tar.bz2
Linux 32/64-bit (x86)
http://dl.google.com/android/ndk/android-ndk-r6-linux-x86.tar.bz2
Android SDK 3.1
Windows
Http://dl.google.com/android/android-sdk_r11-windows.zip
Http://dl.google.com/android/installer_r11-windows.exe
Mac OS X (Intel)
Http://dl.google.com/android/android-sdk_r11-mac_x86.zip
Linux (i386)
Http://dl.google.com/android/android-sdk_r11-linux_x86.tgz
Android NDK r5b
Windows
Http://dl.google.com/android/ndk/android-ndk-r5b-windows.zip
Mac OS X (Intel)
http://dl.google.com/android/ndk/android-ndk-r5b-darwin-x86.tar.bz2
Linux
http://dl.google.com/android/ndk/android-ndk-r5b-linux-x86.tar.bz2
Android SDK 3.0
Windows
Http://dl.google.com/android/installer_r10-windows.exe
Http://dl.google.com/android/android-sdk_r10-windows.zip
Mac OS X (Intel)
Http://dl.google.com/android/android-sdk_r10-mac_x86.zip
Linux (i386)
Http://dl.google.com/android/android-sdk_r10-linux_x86.tgz
Android SDK 2.3
Windows
Http://dl.google.com/android/android-sdk_r08-windows.zip
Http://dl.google.com/android/installer_r08-windows.exe
Linux (i386)
Http://dl.google.com/android/android-sdk_r08-linux_86.tgz
MAC OS X (Intel)
Http://dl.google.com/android/android-sdk_r08-mac_86.zip
Android NDK R5
Windows
Http://dl.google.com/android/ndk/android-ndk-r5-windows.zip
Mac OS X (Intel) R5
http://dl.google.com/android/ndk/android-ndk-r5-darwin-x86.tar.bz2
Linux 32/64-bit (x86) R5
http://dl.google.com/android/ndk/android-ndk-r5-linux-x86.tar.bz2
Android SDK Android NDK android Studio official