I suppose you don't know who am I since your consider me as a user... I'm the co-author of the initial version of the sonar android lint plugin that has been moved to Sonar plugin community after I spoke to Freddy Mallet.
"Copyright (C) 2013 SonarSource and Jerome Van Der Linden, Stephane Nicolas, Florian Roncari, Thomas Bores"
Now that you know, I hope I can answer here and not on user ml. I would like to create issues but I can't... so I took this one to speak about the rule importer. I don't care about the source importer, you are totally right.
I had a ProfileImporter in the initial version that permit to do the feature I describe above (https://github.com/jeromevdl/sonar-android-lint-plugin/blob/master/src/main/java/org/sonar/plugins/android/lint/AndroidLintProfileImporter.java). This class has been removed during issue
SONARPLUGINS-3065 (https://github.com/SonarCommunity/sonar-android/commit/220daeaf81027b47c00a74bad91ef9a0fc969def#diff-72e5fa0714f849107d4d415f115b8133). Why ? Maybe it was not compliant with all the refactoring that has been done, but maybe it could have been refactored instead of removed ?
An android project still a java project, so we may have android lint checks but also findbugs, pmd, checkstyle... We could do that with the ProfileImporter. It is not possible anymore now.