lint checking, removed test code

.travis.yml

@@ -0,0 +1,30 @@
+language: android
+
+jdk:
+    - oraclejdk8
+
+android:
+  components:
+    - tools
+    - build-tools-23.0.2
+    - android-23
+    - extra-android-m2repository
+    - extra-google-m2repository
+    - extra-android-support
+
+notifications:
+    email:
+        - [email protected]
+
+cache: false
+sudo: false
+
+install:
+    # Ensure Gradle wrapper is executable, download wrapper and show version
+    - chmod +x ./gradlew; ls -l gradlew; ./gradlew wrapper -v
+
+    # Download and show android dependencies
+    - ./gradlew androidDependencies
+
+script:
+    - ./gradlew library:check library:assemble

build.gradle

@@ -5,26 +5,20 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:+'
+        classpath 'com.android.tools.build:gradle:2.1.0-alpha2'
     }
 }
 
 allprojects {
-    apply plugin: 'maven'
-    apply plugin: 'maven-publish'
+    version = VERSION_NAME
+    group = GROUP
 
     repositories {
+        jcenter()
         mavenCentral()
-        mavenLocal()
-        maven {
-            url uri("https://oss.sonatype.org/content/repositories/snapshots")
-        }
-        maven {
-            url uri("https://oss.sonatype.org/content/repositories/releases")
-        }
     }
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '2.9'
+    gradleVersion = '2.11'
 }

checkstyle.gradle

@@ -0,0 +1,26 @@
+apply plugin: 'checkstyle'
+
+checkstyle {
+    toolVersion '6.8'
+    configFile rootProject.file('gradle/checkstyle.xml')
+    showViolations true
+    configProperties = [
+            'checkstyle.cache.file': rootProject.file('build/checkstyle.cache'),
+    ]
+}
+
+def variants = (project.plugins.hasPlugin('android-library') ?
+        project.android.libraryVariants :
+        project.android.applicationVariants)
+
+variants.all { variant ->
+    def name = variant.buildType.name
+
+    def checkstyle = project.tasks.create "checkstyle${name.capitalize()}", Checkstyle
+    checkstyle.dependsOn variant.javaCompile
+    checkstyle.source variant.javaCompile.source
+    checkstyle.classpath = project.fileTree(variant.javaCompile.destinationDir)
+    checkstyle.exclude('**/BuildConfig.java')
+    checkstyle.exclude('**/R.java')
+    project.tasks.getByName("check").dependsOn checkstyle
+}

demo/build.gradle

@@ -6,14 +6,14 @@ dependencies {
 }
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion '23.0.2'
+    compileSdkVersion ANDROID_BUILD_SDK_VERSION as int
+    buildToolsVersion ANDROID_BUILD_TOOLS_VERSION
 
     defaultConfig {
         versionCode 1
         versionName '1.0.0'
-        minSdkVersion 14
-        targetSdkVersion 23
+        minSdkVersion 16
+        targetSdkVersion ANDROID_BUILD_TARGET_SDK_VERSION as int
     }
 
     sourceSets {