Issue 4248 - Add codestyle check

libadblockplus-android-tests/build.gradle

 apply plugin: 'com.android.application'
+apply plugin: 'checkstyle'
 
 allprojects {
     repositories {
         mavenLocal()
         mavenCentral()
     }
 }
 
 repositories {
     mavenLocal()
@@ skipping 26 matching lines @@
                     project ":libadblockplus-android"
                 }
             }
         }
     }
 }
 
 dependencies {
     androidTestCompile project(':libadblockplus-android')
     androidTestCompile fileTree(include: ['*.jar'], dir: 'libs')
+}
+
+checkstyle {
+    toolVersion = '6.19'
+}
+
+task checkstyleMain(type: Checkstyle) {
+    ignoreFailures = true
+    showViolations = true
+    source 'src/org/adblockplus/'
+    exclude '**/gen/**'
+    exclude '**/R.java'
+    exclude '**/BuildConfig.java'
+    reports {
+        xml.destination "$project.buildDir/reports/checkstyle/main.xml"
+    }
+    classpath = files()
+    configFile = file("${rootProject.rootDir}/third_party/checkstyle/java/rules/eyeo_test_checks.xml")
+    configProperties = [
+            "checkstyle.header.file" : file("${rootProject.rootDir}/third_party/checkstyle/java/res/header.txt")
+    ]
 }