Build against Android Pie / API 28

See official release notes [0].

Fixes #17, #18

[0] https://developer.android.com/about/versions/pie/android-9.0

.travis.yml

@@ -5,8 +5,8 @@ android:
   components:
     - platform-tools
     - tools
-    - build-tools-27.0.3
-    - android-27
+    - build-tools-28.0.3
+    - android-28
     - extra-android-m2repository
     - extra-google-m2repository
 env:

build.gradle

@@ -39,7 +39,6 @@ allprojects {
 ext {
     mockitoVersion = '2.18.3'
     robolectricVersion = '3.8'
-    supportLibraryVersion = '27.1.1'
 }
 
 task clean(type: Delete) {

customtabs-example/build.gradle

@@ -17,13 +17,12 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 27
-    buildToolsVersion '28.0.3'
+    compileSdkVersion 28
 
     defaultConfig {
         applicationId 'com.example.saschpe.customtabs'
         minSdkVersion 17
-        targetSdkVersion 27
+        targetSdkVersion 28
         versionCode 170112
         versionName '1.1.2'
         archivesBaseName = "${applicationId}-${versionName}"
@@ -34,9 +33,9 @@ android {
 
 dependencies {
     implementation project(':customtabs')
-    implementation "com.android.support:animated-vector-drawable:$rootProject.supportLibraryVersion"
-    implementation "com.android.support:appcompat-v7:$rootProject.supportLibraryVersion"
-    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
-    implementation "com.android.support:customtabs:$rootProject.supportLibraryVersion"
-    implementation "com.android.support:design:$rootProject.supportLibraryVersion"
+    implementation 'com.android.support:animated-vector-drawable:28.0.0'
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+    implementation 'com.android.support:customtabs:28.0.0'
+    implementation 'com.android.support:design:28.0.0'
 }

customtabs/build.gradle

@@ -31,12 +31,11 @@ if (localPropertiesFile.file) {
 apply plugin: 'com.android.library'
 
 android {
-    compileSdkVersion 27
-    buildToolsVersion '28.0.3'
+    compileSdkVersion 28
 
     defaultConfig {
         minSdkVersion 15
-        targetSdkVersion 27
+        targetSdkVersion 28
         versionName '1.1.2'
     }
 
@@ -53,8 +52,8 @@ android {
 }
 
 dependencies {
-    api "com.android.support:appcompat-v7:$rootProject.supportLibraryVersion"
-    api "com.android.support:customtabs:$rootProject.supportLibraryVersion"
+    api 'com.android.support:appcompat-v7:28.0.0'
+    api 'com.android.support:customtabs:28.0.0'
 
     testImplementation 'junit:junit:4.12'
     testImplementation "org.robolectric:robolectric:$rootProject.robolectricVersion"

customtabs/src/test/java/saschpe/android/customtabs/CustomTabsPackageHelperTest.java

@@ -24,7 +24,7 @@
 
 import java.util.List;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 @RunWith(RobolectricTestRunner.class)
@@ -36,7 +36,7 @@ public void getPackageNameToUse_noMockingReturnsNull() {
         String packageName = CustomTabsPackageHelper.getPackageNameToUse(RuntimeEnvironment.application);
 
         // Assert
-        assertEquals(null, packageName);
+        assertNull(packageName);
     }
 
     @Test

customtabs/src/test/java/saschpe/android/customtabs/KeepAliveServiceTest.java

@@ -29,7 +29,7 @@
 @RunWith(JUnit4.class)
 public class KeepAliveServiceTest {
     // Arrange
-    private Intent mockIntent = mock(Intent.class);
+    private final Intent mockIntent = mock(Intent.class);
 
     @Test
     public void onBind_returnsValidBinder() {