Fix build

.travis.yml

@@ -5,48 +5,29 @@ jdk:
 
 env:
     global:
-        - NDK_VERSION=r12b
-        - NDK_CCACHE=ccache
         - GOROOT_BOOTSTRAP=$GOROOT
-        - ANDROID_NDK_HOME=$HOME/.android/android-ndk-${NDK_VERSION}
-        - SBTPATH=$HOME/.sbt
-        - PATH=${ANDROID_NDK_HOME}:${ANDROID_HOME}/tools:${ANDROID_HOME}/platform-tools:${PATH}
-
-scala:
-    - 2.11.8
 
 before_cache:
-    - find $HOME/.sbt -name "*.lock" | xargs rm
-    - find $HOME/.ivy2 -name "*.lock" | xargs rm
+    - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+    - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
 
 cache:
     directories:
-        - $HOME/.ivy2
-        - $HOME/.sbt
-
-android:
-    components:
-        - tools
-        - build-tools-25.0.2
-        - extra-android-m2repository
-        - extra-google-m2repository
+        - $HOME/.gradle/caches/
+        - $HOME/.gradle/wrapper/
 
 install:
-    - >
-      if [ ! -d "$ANDROID_NDK_HOME" ]; then
-          mkdir -p $ANDROID_NDK_HOME;
-          pushd $HOME/.android;
-          export ARCH=`uname -m`;
-          wget -q http://dl.google.com/android/repository/android-ndk-${NDK_VERSION}-linux-${ARCH}.zip;
-          unzip -q android-ndk-${NDK_VERSION}-linux-${ARCH}.zip;
-          popd;
-      fi
-    - >
-      if [ ! -f "$SBTPATH/sbt" ]; then
-          pushd $SBTPATH;
-          wget -q https://raw.githubusercontent.com/paulp/sbt-extras/master/sbt;
-          chmod a+x sbt;
-          popd;
-      fi
+    - pushd $ANDROID_HOME
+    - rm -rf tools
+    - wget -q https://dl.google.com/android/repository/sdk-tools-linux-4333796.zip -O tools.zip
+    - unzip -q tools.zip
+    - popd
+    - touch $HOME/.android/repositories.cfg
+    - yes | sdkmanager
+        "build-tools;28.0.0"
+        ndk-bundle
+        "platforms;android-28"
+      >/dev/null
+
 script:
-    - $SBTPATH/sbt go-build android:package
+    - ./gradlew assembleDebug check

app/build.gradle

@@ -17,11 +17,12 @@ def getCurrentFlavor() {
 }
 
 android {
-    compileSdkVersion rootProject.sdkVersion
+    buildToolsVersion "28.0.0"
+    compileSdkVersion 28
     defaultConfig {
         applicationId "com.github.shadowsocks.plugin.kcptun"
         minSdkVersion rootProject.minSdkVersion
-        targetSdkVersion rootProject.sdkVersion
+        targetSdkVersion 28
         versionCode 10000
         versionName "0.1.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

build.gradle

@@ -4,17 +4,16 @@ apply plugin: 'com.github.ben-manes.versions'
 
 buildscript {
     ext {
-        kotlinVersion = '1.2.41'
+        kotlinVersion = '1.2.50'
         minSdkVersion = 21
-        sdkVersion = 27
     }
     repositories {
         google()
         jcenter()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.1.3'
-        classpath 'com.github.ben-manes:gradle-versions-plugin:0.17.0'
+        classpath 'com.github.ben-manes:gradle-versions-plugin:0.20.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
     }
 }

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.8.1-all.zip