android: added .apk sigining

.travis.yml

@@ -15,6 +15,7 @@ matrix:
     sudo: required
     dist: trusty
     cache: ccache
+    before_install: openssl aes-256-cbc -K $encrypted_7333c7dd5b15_key -iv $encrypted_7333c7dd5b15_iv -in android/avocado.keystore.enc -out android/avocado.keystore -d
     install: "./.travis/android/pull-container.sh"
     script: "./.travis/android/run-container.sh"
     after_success: "./.travis/notify-discord.sh success $WEBHOOK_URL"

.travis/android/build.sh

@@ -8,7 +8,7 @@ export DATE=`date +%Y%m%d`
 export COMMIT=`git rev-parse --short=7 HEAD`
 export ARTIFACT=avocado-$OS-$DATE-$COMMIT.apk
 export ASSETS_DIR=android/app/src/main/assets
-export TARGET_DIR=android/app/build/outputs/apk/debug
+export TARGET_DIR=android/app/build/outputs/apk/release
 export NDK_CCACHE="$(which ccache)"
 
 # Configure cache
@@ -28,13 +28,13 @@ pushd android
 NDK_PROJECT_PATH=`pwd`/app ndk-build PM5_CONFIG=release_x64 -j4 avocado NDK_DEBUG=0
 ccache -s
 
-# Java code (debug for now)
-./gradlew assembleDebug
+# Java code
+./gradlew assembleRelease
 popd
 
 # Tests
 # No test suite for Android right now
 
 # Package and prepare upload artifact
 mkdir -p upload
-cp $TARGET_DIR/app-debug.apk upload/$ARTIFACT
+cp $TARGET_DIR/app-release.apk upload/$ARTIFACT

android/app/build.gradle

@@ -24,6 +24,15 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+
+    def isRunningOnTravis = System.getenv("CI") == "true"
+    if (isRunningOnTravis) {
+        signingConfigs.release.storeFile = file("../avocado.keystore")
+        signingConfigs.release.keyAlias = "avocado"
+        signingConfigs.release.storePassword = System.getenv("keystore_password")
+        signingConfigs.release.keyPassword = System.getenv("keystore_password")
+    }
+
 //    externalNativeBuild {
 //        ndkBuild {
 //            path 'jni/Android.mk'