CB-14089: (android) Add Kotlin support

bin/templates/project/app/build.gradle

@@ -18,16 +18,25 @@
 */
 
 apply plugin: 'com.android.application'
+if (cdvHelpers.getConfigPreference('EnableKotlin', 'false').toBoolean()) {
+    apply plugin: 'kotlin-android'
+}
 
 buildscript {
+    ext.kotlin_version = '1.3.31'
     repositories {
         mavenCentral()
         google()
         jcenter()
     }
 
     dependencies {
+        apply from: '../../framework/cordova.gradle'
+
         classpath 'com.android.tools.build:gradle:3.3.0'
+        if (cdvHelpers.getConfigPreference('EnableKotlin', 'false').toBoolean()) {
+            classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        }
     }
 }
 
@@ -291,6 +300,11 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: '*.jar')
+
+    if (cdvHelpers.getConfigPreference('EnableKotlin', 'false').toBoolean()) {
+        compile "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    }
+
     // SUB-PROJECT DEPENDENCIES START
     debugCompile(project(path: ":CordovaLib", configuration: "debug"))
     releaseCompile(project(path: ":CordovaLib", configuration: "release"))

test/app/build.gradle

@@ -17,6 +17,7 @@
 */
 
 apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion 28
@@ -51,4 +52,8 @@ dependencies {
     implementation 'com.android.support:appcompat-v7:26.1.0'
     testImplementation 'junit:junit:4.12'
     testImplementation 'org.json:json:20140107'
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+}
+repositories {
+    mavenCentral()
 }

test/app/src/androidTest/java/org/apache/cordova/unittests/KotlinStandardActivityTest.kt

@@ -0,0 +1,66 @@
+/*
+       Licensed to the Apache Software Foundation (ASF) under one
+       or more contributor license agreements.  See the NOTICE file
+       distributed with this work for additional information
+       regarding copyright ownership.  The ASF licenses this file
+       to you under the Apache License, Version 2.0 (the
+       "License"); you may not use this file except in compliance
+       with the License.  You may obtain a copy of the License at
+
+         http://www.apache.org/licenses/LICENSE-2.0
+
+       Unless required by applicable law or agreed to in writing,
+       software distributed under the License is distributed on an
+       "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+       KIND, either express or implied.  See the License for the
+       specific language governing permissions and limitations
+       under the License.
+*/
+
+package org.apache.cordova.unittests
+
+import android.content.Intent
+import android.support.test.rule.ActivityTestRule
+import android.support.test.runner.AndroidJUnit4
+
+import org.apache.cordova.engine.SystemWebView
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import junit.framework.Assert.assertEquals
+
+/**
+ * The purpose of this test is to test the default application that is generated by Cordova itself
+ *
+ */
+@RunWith(AndroidJUnit4::class)
+public class KotlinStandardActivityTest {
+
+    // Don't launch the activity, we're going to send it intents
+    @get:Rule
+    var mActivityRule = ActivityTestRule(
+            StandardActivity::class.java, true, false)
+
+    @Before
+    fun launchApplicationWithIntent() {
+        val intent = Intent()
+        intent.putExtra("startUrl", FALSE_URI)
+        intent.putExtra("backgroundcolor", "#0000ff")
+        mActivityRule.launchActivity(intent)
+    }
+
+    @Test
+    fun webViewCheck() {
+        val activity = mActivityRule.getActivity() as StandardActivity
+        //Fish the webview out of the mostly locked down Activity using the Android SDK
+        val view = activity.getWindow().getCurrentFocus()
+        assertEquals(SystemWebView::class, view::class)
+    }
+
+    companion object {
+        private val FALSE_URI = "http://www.google.com"
+    }
+
+}

test/build.gradle

@@ -19,6 +19,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
+    ext.kotlin_version = '1.3.31'
     repositories {
         google()
         jcenter()
@@ -29,6 +30,7 @@ buildscript {
         // in the individual module build.gradle files
 
         classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }