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buildscript {
    repositories {
        // Gradle 4.1 and higher include support for Google's Maven repo using
        // the google() method. And you need to include this repo to download
        // Android plugin 3.0.0 or higher.
        google()
        ...
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'

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distributionUrl = https\://services.gradle.org/distributions/gradle-4.1-all.zip
...

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android {
    defaultConfig {
      manifestPlaceholders = [hostName:"www.example.com"]
        ...
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }

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android {
    ...
    defaultConfig {...}
    buildTypes {...}
    productFlavors {
        demo {
            applicationIdSuffix ".demo"
            versionNameSuffix "-demo"
        }
        full {

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apply plugin: 'com.android.application'

android { ... }
dependencies {
    // Dependency on a local library module
    compile project(":mylibrary")

    // Dependency on local binaries
    compile fileTree(dir: 'libs', include: ['*.jar'])

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allprojects {
    repositories {
        jcenter()
    }
}

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android {
    ...
    defaultConfig { ... }
    signingConfigs {
        release {
            storeFile file("my-release-key.jks")
            storePassword "password"
            keyAlias "my-alias"
            keyPassword "password"
        }

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android {
   buildTypes {
       release {
           minifyEnabled true
           proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
       }
   }
   ...
}

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android {
    ...
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'),
                   'proguard-rules.pro'
        }
    }

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release {
   minifyEnabled true
   shrinkResources true
   signingConfig signingConfigs.releaseConfig
   proguardFiles getDefaultProguardFile('proguard-android.txt')
   proguardFiles fileTree(dir: 'proguard', include: ['*.pro']).asList().toArray()
}