Android gradle: buildtoolsVersion vs compileSdkVersion

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compileSdkVersion is the API version of Android that you compile against.

buildToolsVersion is the version of the compilers (aapt, dx, renderscript compiler, etc…) that you want to use. For each API level (starting with 18), there is a matching .0.0 version.

At IO 2014, we release API 20 and build-tools 20.0.0 to go with it.

Between Android releases we will release updates of the compilers, and so we’ll release version .0.1, .0.2, etc… Because we don’t want to silently update these version under you, it’s up to you to move to the new version when it’s convenient for you.

You can use a higher version of the build-tools than your compileSdkVersion, in order to pick up new/better compiler while not changing what you build your app against.

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