Fix download Android Build-tools 19.1.0 failed

Ready to go from Eclipse to Android studio. Today, when trying Android studio, it reminds me that the SDK Android Build-tools version is too low and needs to be upgraded.
So open the Android SDK Manager, it successfully helped me find Android SDK Build-tools the 19.1 version, but download the time is dead and alive download--android SDK Manager in the country has always been unstable, when good and bad, And today, I still can't download it without a ladder.
Helpless, had to manually download, but found a lap, incredibly did not find the official Google download link, on the http://developer.android.com/sdk/index.html only found the Android tools and IDE download link.

OK, here's the procedure for manually analyzing the download link:

↑ This is the management interface of the Android SDK Manager and then view its logs ↓:

The list of discovered SDKs is parsed from one xml: Https://dl-ssl.google.com/android/repository/repository-8.xml
OK, then open this address with your browser:
The XML file is exactly the information for these SDK listings, and then looking for what I need Android SDK Build-tools 19.1 , duang~ sees a sdk:url node called:

The display URL is build-tools_r19.1-macosx.zip . Then, by trying to find the complete URL is https://dl-ssl.google.com/android/repository/build-tools_r19.1-macosx.zip--direct access, it is downloaded to this build-tools_r19.1-macosx.zip Zip package, and then throw it into the Build-tools directory of the local SDK, biu~ fix it!

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Fix download Android Build-tools 19.1.0 failed