My build.gradle Boilerplate

(app) build.gradle

buildscript {
  repositories {
    google()
    jcenter()
    mavenCentral()
  }
}

repositories {
  google()
  jcenter()
  mavenCentral()
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'

// Version
def versionMajor = 1
def versionMinor = 0
def versionPatch = 0

// Package
def packageName = "" // input here

android {
  compileSdkVersion 28

  defaultConfig {
    applicationId packageName
    minSdkVersion 19
    targetSdkVersion 28
    versionCode versionMajor * 100 + versionMinor * 10 + versionPatch
    versionName "$versionMajor.$versionMinor.$versionPatch"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    vectorDrawables.useSupportLibrary = true
  }
  buildTypes {
    release {
      shrinkResources true
      debuggable false
      jniDebuggable false
      minifyEnabled true
      zipAlignEnabled true
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
    debug {
      applicationIdSuffix '.debug'
      versionNameSuffix '-dev'
      shrinkResources false
      debuggable true
      jniDebuggable true
      zipAlignEnabled true
      minifyEnabled false
    }
  }
  packagingOptions {
    exclude 'META-INF/NOTICE.txt'
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/DEPENDENCIES'
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/services/javax.annotation.processing.Processor'
  }
  dataBinding {
    enabled = true
  }
}

// Library version
ext {
  support_lib_version = '28.0.0'
  constraint_layout_version = '1.1.3'
}

dependencies {
  implementation fileTree(dir: 'libs', include: ['*.jar'])
  testImplementation 'junit:junit:4.12'
  androidTestImplementation 'com.android.support.test:runner:1.0.2'
  androidTestImplementation('com.android.support.test.espresso:espresso-core:3.0.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
    exclude group: 'com.google.code.findbugs', module: 'jsr305'
  })

  // Google
  implementation "com.android.support:support-annotations:$support_lib_version"
  implementation "com.android.support:support-v4:$support_lib_version"
  implementation "com.android.support:appcompat-v7:$support_lib_version"
  implementation "com.android.support:recyclerview-v7:$support_lib_version"
  implementation "com.android.support:cardview-v7:$support_lib_version"
  implementation "com.android.support:gridlayout-v7:$support_lib_version"
  implementation "com.android.support:preference-v7:$support_lib_version"
  implementation "com.android.support:preference-v14:$support_lib_version"
  implementation "com.android.support:design:$support_lib_version"
  implementation "com.android.support:customtabs:$support_lib_version"
  implementation "com.android.support.constraint:constraint-layout:$constraint_layout_version"
  
  // Kotlin
  implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

(project) build.gradle

buildscript {
  ext.gradle_version = '3.2.1'
  ext.kotlin_version = '1.2.71'
  repositories {
    google()
    jcenter()
    mavenCentral()
  }
  dependencies {
    classpath "com.android.tools.build:gradle:$gradle_version"
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
  }
}

allprojects {
  repositories {
    google()
    jcenter()
    mavenCentral()
  }
}

task clean(type: Delete) {
  delete rootProject.buildDir
}

extend.gradle

// Library version
ext {
  // Google
  support_lib_version = '28.0.0'
  constraint_layout_version = '1.1.3'

  // Rx
  rxjava_version = '2.2.3'
  rxbinding_version = '2.2.0'
  rxandroid_version = '2.1.0'
  rxkotlin_version = '2.3.0'

  // Annotation Processing
  permission_dispatcher_version = '3.3.1'
  dagger_version = '2.17'
  onactivityresult_version = '0.7.0'

  // Backport
  threeten_version = '1.1.0'

  // Logging
  timber_version = '4.7.1'

  // Kotlin Coroutines
  kotlin_coroutines_version = '0.30.2'
}

dependencies {
  implementation fileTree(dir: 'libs', include: ['*.jar'])
  testImplementation 'junit:junit:4.12'
  androidTestImplementation 'com.android.support.test:runner:1.0.2'
  androidTestImplementation('com.android.support.test.espresso:espresso-core:3.0.2', {
    exclude group: 'com.android.support', module: 'support-annotations'
    exclude group: 'com.google.code.findbugs', module: 'jsr305'
  })

  // Google
  implementation "com.android.support:support-annotations:$support_lib_version"
  implementation "com.android.support:support-v4:$support_lib_version"
  implementation "com.android.support:appcompat-v7:$support_lib_version"
  implementation "com.android.support:recyclerview-v7:$support_lib_version"
  implementation "com.android.support:cardview-v7:$support_lib_version"
  implementation "com.android.support:gridlayout-v7:$support_lib_version"
  implementation "com.android.support:preference-v7:$support_lib_version"
  implementation "com.android.support:preference-v14:$support_lib_version"
  implementation "com.android.support:design:$support_lib_version"
  implementation "com.android.support:customtabs:$support_lib_version"
  implementation "com.android.support.constraint:constraint-layout:$constraint_layout_version"
  
  // Kotlin
  implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
  implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlin_coroutines_version"
  implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$kotlin_coroutines_version"
  
  // DI
  implementation "com.google.dagger:dagger:$dagger_version"
  kapt "com.google.dagger:dagger-compiler:$dagger_version"
  compileOnly 'javax.annotation:jsr250-api:1.0'

  // Square
  implementation "com.jakewharton.timber:timber:$timber_version"

  // Rx
  implementation "io.reactivex.rxjava2:rxjava:$rxjava_version"
  implementation "io.reactivex.rxjava2:rxandroid:$rxandroid_version"
  implementation "io.reactivex.rxjava2:rxkotlin:$rxkotlin_version"
  implementation "com.jakewharton.rxbinding2:rxbinding:$rxbinding_version"
  implementation "com.jakewharton.rxbinding2:rxbinding-support-v4:$rxbinding_version"
  implementation "com.jakewharton.rxbinding2:rxbinding-appcompat-v7:$rxbinding_version"

  // Backport
  implementation "com.jakewharton.threetenabp:threetenabp:$threeten_version"

  // Permission
  implementation("com.github.hotchemi:permissionsdispatcher:$permission_dispatcher_version", {
    exclude module: "support-v13"
  })
  kapt "com.github.hotchemi:permissionsdispatcher-processor:$permission_dispatcher_version"
  
  // OnActivityResult
  implementation "com.vanniktech:onactivityresult:$onactivityresult_version"
  kapt "com.vanniktech:onactivityresult-compiler:$onactivityresult_version"
}

gradle.properties

# Gradle
org.gradle.daemon=true
org.gradle.jvmargs=-Xmx4096m -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
org.gradle.caching=true

# Kotlin
kotlin.incremental=true

upgrade_gradle_command.sh

./gradlew wrapper --gradle-version 4.10.1 --distribution-type all