Update travis CI configurations

Author: hendrawd

.travis.yml

@@ -1,6 +1,15 @@
 language: android
-
 sudo: false
+dist: precise
+
+env:
+  global:
+   - ANDROID_API_LEVEL=26
+   - ANDROID_EMULATOR_API_LEVEL=21
+   - ANDROID_BUILD_TOOLS_VERSION=26.0.2
+   - ANDROID_ABI=armeabi-v7a
+   # install timeout in minutes (2 minutes by default)
+   - ADB_INSTALL_TIMEOUT=8
 
 android:
   components:
@@ -11,23 +20,19 @@ android:
     # Additional components
     - extra-google-google_play_services
     - extra-google-m2repository
+    # Support library
+    - extra-android-support
     - extra-android-m2repository
 
     # The BuildTools version used by this project
-    - build-tools-25.0.2
+    - build-tools-$ANDROID_BUILD_TOOLS_VERSION
 
     # The SDK version used to compile your project
-    - android-16
-    - android-21
-    - android-22
-    - android-25
+    - android-$ANDROID_API_LEVEL
 
     # Specify at least one system image,
     # if you need to run emulator(s) during your tests
-    - sys-img-armeabi-v7a-android-16
-    - sys-img-armeabi-v7a-android-21
-    - sys-img-armeabi-v7a-android-22
-    - sys-img-armeabi-v7a-android-25
+    - sys-img-armeabi-v7a-$ANDROID_EMULATOR_API_LEVEL
 
 jdk:
   - oraclejdk8
@@ -36,6 +41,7 @@ os:
   - linux
 
 before_install:
+  - chmod +x ./gradlew
   - mkdir "$ANDROID_HOME/licenses" || true
   - echo -e "\n8933bad161af4178b1185d1a37fbf41ea5269c55" > "$ANDROID_HOME/licenses/android-sdk-license"
   - echo -e "\n84831b9409646a918e30573bab4c9c91346d8abd" > "$ANDROID_HOME/licenses/android-sdk-preview-license"
@@ -45,18 +51,13 @@ licenses:
   - 'android-sdk-license-.+'
   - 'google-gdk-license-.+'
 
-env:
-  global:
-    # install timeout in minutes (2 minutes by default)
-    - ADB_INSTALL_TIMEOUT=8
-
 script:
   - android list target
   - ./gradlew build connectedCheck -PdisablePreDex
 
 # Emulator Management: Create, Start and Wait
 before_script:
-  - echo no | android create avd --force -n test -t android-21 --abi armeabi-v7a
+  - echo no | android create avd --force -n test -t android-$ANDROID_EMULATOR_API_LEVEL --abi $ANDROID_ABI
   - emulator -avd test -no-skin -no-audio -no-window &
   - android-wait-for-emulator
   - adb shell input keyevent 82 &

app/build.gradle

@@ -6,6 +6,7 @@ apply plugin: 'kotlin-android-extensions'
 
 android {
     compileSdkVersion 26
+    buildToolsVersion "26.0.2"
     defaultConfig {
         applicationId "id.co.ionsoft.randomnumberanimation"
         minSdkVersion 14

randomnumberanimationlibrary/build.gradle

@@ -3,7 +3,7 @@ apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion 26
-
+    buildToolsVersion "26.0.2"
     defaultConfig {
         minSdkVersion 14
         targetSdkVersion 26