Add sample for Android Studio 3.x

As of 3.0 beta 5, we finally have support for automatically packaging
and running lint checks in your project, such that you don't have to
add your own local jar copy tasks anymore (or worse, dropping it in
~/.android/lint as the current version of this sample describes).

This CL moves the current sample into an android-studio-2 folder,
and adds a new adnroid-studio-3 folder with a project showing the
new project layout.

Author: tnorbye

README.md

@@ -1,5 +1,5 @@
 Custom Lint Rules
-============
+=================
 
 The [Android `lint` tool](http://developer.android.com/tools/help/lint.html) is a static code
  analysis tool that checks your Android project source files for potential bugs and optimization
@@ -31,31 +31,15 @@ git clone https://github.com/googlesamples/android-custom-lint-rules.git
 cd android-custom-lint-rules
 ```
 
-##### Build the validator
+##### Build the code
 
-`./gradlew build`
-
-##### Copy to the lint directory
-
-`cp ./build/libs/android-custom-lint-rules.jar ~/.android/lint/`
-
-##### Verify whether the issues are registered with lint
-
-`lint --show MainActivityDetector`
-
-##### Run lint
-
-`./gradlew lint`
-
-> Note: If you can't run `lint` directly, you may want to include android tools `PATH` in your
- `~/.bash_profile`.
-> (i.e. `PATH=$PATH:~/Library/Android/sdk/tools`)
->
-> Then run `source ~/.bash_profile`.
+For Android Studio 3.x and above, use the sample in `android-studio-3`.
+If you are targeting Android Studio 2.x and older, use the sample in `android-studio-2`.
 
 Support
 -------
 
+- The "lint-dev" Google group: https://groups.google.com/forum/#!forum/lint-dev
 - Google+ Community: https://plus.google.com/communities/105153134372062985968
 - Stack Overflow: http://stackoverflow.com/questions/tagged/android
 

android-studio-2/README.md

@@ -0,0 +1,33 @@
+See README.md in the parent directory for general information.
+
+Getting Started
+---------------
+
+##### Fetch code
+
+```
+git clone https://github.com/googlesamples/android-custom-lint-rules.git
+cd android-custom-lint-rules
+```
+
+##### Build the validator
+
+`./gradlew build`
+
+##### Copy to the lint directory
+
+`cp ./build/libs/android-custom-lint-rules.jar ~/.android/lint/`
+
+##### Verify whether the issues are registered with lint
+
+`lint --show MainActivityDetector`
+
+##### Run lint
+
+`./gradlew lint`
+
+> Note: If you can't run `lint` directly, you may want to include android tools `PATH` in your
+ `~/.bash_profile`.
+> (i.e. `PATH=$PATH:~/Library/Android/sdk/tools`)
+>
+> Then run `source ~/.bash_profile`.

build.gradle renamed to android-studio-2/build.gradle

@@ -36,7 +36,7 @@ dependencies {
 
 jar {
     manifest {
-        attributes("Lint-Registry-v2": "com.example.google.lint.MyIssueRegistry")
+        attributes("Lint-Registry": "com.example.google.lint.MyIssueRegistry")
     }
 }