Update of Android build (with Gradle)

.travis.yml

@@ -84,38 +84,41 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
       # Android
-#    - language: android
-#      android:
-#      addons:
-#        apt:
-#          update: true
-#      components:
-#        - tools
-#        - platform-tools
-#        - android-21
-#        - sys-img-armeabi-v7a-android-21
-#      env:
-#        - ANDROID=true
-#      before_install:
-#        - git submodule update --init --recursive
-#        - sudo apt-get install wget unzip tree
-#      install:
-#        # Accept SDK Licenses + Install NDK
-#        - yes | sdkmanager --update > /dev/null 2>&1
-#        - sdkmanager ndk-bundle > /dev/null 2>&1
-#        # Download Gradle 4.3.1 
-#        - wget https://services.gradle.org/distributions/gradle-4.3.1-bin.zip
-#        - mkdir -p gradle
-#        - unzip -q -d ./gradle gradle-4.3.1-bin.zip
-#        - export GRADLE=${TRAVIS_BUILD_DIR}/gradle/gradle-4.3.1/bin/gradle
-#      before_script:
-#        - bash $GRADLE --version
-#        - cd ./support
-#      script:
-#        - bash $GRADLE clean assemble
-#      after_success:
-#        - cd ${TRAVIS_BUILD_DIR}
-#        - tree ./libs
+    - language: android
+      addons:
+        apt:
+          update: true
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - wget
+            - unzip
+            - tree
+      android:
+        components:
+          - tools
+          - platform-tools
+          - android-21
+      env:
+        - ANDROID=true
+      before_install:
+        # Download/Install Gradle 
+        - wget https://services.gradle.org/distributions/gradle-4.10.2-bin.zip
+        - mkdir -p gradle
+        - unzip -q -d ./gradle gradle-4.10.2-bin.zip
+        - export GRADLE=gradle/gradle-4.10.2/bin/gradle
+        - bash $GRADLE --version
+      install:
+        # Accept SDK Licenses + Install NDK
+        - yes | sdkmanager --update > /dev/null 2>&1
+        - sdkmanager ndk-bundle > /dev/null 2>&1
+      before_script:
+        - pushd ./support
+      script:
+        - bash ../$GRADLE clean assemble
+      after_success:
+        - popd;
+        - tree ./libs
 
 before_script:
   - if [[ "${TRAVIS_OS_NAME}" == "linux" ]]; then export CXX=${COMPILER}; fi

support/AndroidManifest.xml

@@ -1 +1 @@
-<manifest package="fmt" />
+<manifest package="net.fmtlib" />

support/build.gradle

@@ -1,15 +1,25 @@
+
 // General gradle arguments for root project
 buildscript {    
     repositories {
         google()
         jcenter()
     }
-
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        //
+        // https://developer.android.com/studio/releases/gradle-plugin
+        //
+        // Notice that 3.1.3 here is the version of [Android Gradle Plugin]
+        // Accroding to URL above you will need Gradle 4.4 or higher
+        //
+        classpath 'com.android.tools.build:gradle:3.1.3'
     }
 }
-
+repositories {
+    google()
+    jcenter()
+}
+
 // Output: Shared library (.so) for Android 
 apply plugin: 'com.android.library'
 
@@ -24,20 +34,17 @@ android {
     splits {
         abi {
             enable true
-            // Be general, as much as possible ...
-            // universalApk true 
-
             // Specify platforms for Application
             reset()
-            include "x86", "x86_64", "armeabi-v7a", "arm64-v8a"
+            include  "arm64-v8a", "armeabi-v7a", "x86_64"
         }
     }
 
     defaultConfig {
         minSdkVersion 21    // Android 5.0+
         targetSdkVersion 25 // Follow Compile SDK
-        versionCode 16      // Follow release count
-        versionName "4.1.0" // Follow Official version
+        versionCode 20      // Follow release count
+        versionName "5.2.1" // Follow Official version
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 
         externalNativeBuild {
@@ -46,7 +53,7 @@ android {
                 arguments "-DBUILD_SHARED_LIBS=true"    // Build shared object
                 arguments "-DFMT_TEST=false"            // Skip test
                 arguments "-DFMT_DOC=false"             // Skip document
-                cppFlags  "-std=c++14"
+                cppFlags  "-std=c++17"
             }
         }
         println("Gradle CMake Plugin: ")