Always self-update the SDK tools before installing build tools

[sschuberth]

This is more or less a simplified version of PRs #87, #44, #41, #37, in the sense that it always self-updates the SDK tools before installing the build tools, and does so after resolving the platform tools. The latter is necessary as the SDK tools depend on the platform tools, and resolving the SDK tools first would result in an error like

Skipping 'Android SDK Tools, revision 24.4.1'; it depends on 'Android SDK Platform-tools, revision 23.1 rc1' which was not installed.

This PR fixes a bunch of issues, mainly issue #43, but also issue #101 and related ones.

[pelegb]

Hi,
I'm using this PR version in a project with multiple subprojects each is android library and one is an app. It seems that the plugin downloasd Android SDK tools 24.4.1 again and again between the different subprojects and between subsequent builds.
It seems that some kind of "already installed" mechanism isn't in place.

Thanks

[sschuberth]

Confirmed. I was assuming the update command itself to be smart enough to only do the download if there actually is something to update. I'll look into it.

[sschuberth]

@pelegb Would you mind trying the force-pushed update to this PR?

[pelegb]

@sschuberth it doesn't seem to solve the issue. The tools are being updated in each subproject and in each build.

Thanks for the quick response.

[sschuberth]

@pelegb Thanks for checking, I believe to have found the issue. Please try again with the new force-pushed version.

[pelegb]

@sschuberth I'm receiving "No SDK tools available for update." in subsequent builds. Strange.

[pelegb]

I think I found the issue, you need to use listAll instead of listUpdate android command because once installed the tools don't appear in the list anymore

[sschuberth]

Why is that an issue? I'd say it works as expected. Once the latest SDK tools have been installed, they naturally are not available for update anymore.

[pelegb]

Your correct. Thanks

[sschuberth]

So can you confirm it's working correctly for you now?

[pelegb]

Yes

[sschuberth]

Great, thanks for checking!

[sschuberth]

Closing this as the Android Gradle plugin 2.2.0 has this feature built-in and this whole project is deprecated now.