apply plugin: 'com.android.application'android {compileSdkVersion 27defaultConfig {applicationId "com.why.project.androidcnblogsdemo"minSdkVersion 16targetSdkVersion 27versionCode 1versionName "1.0"testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"}buildTypes {release {minifyEnabled falseproguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'}}
}dependencies {implementation fileTree(dir: 'libs', include: ['*.jar'])implementation 'com.android.support:appcompat-v7:27.1.1'implementation 'com.android.support.constraint:constraint-layout:1.1.2'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'}

// Top-level build file where you can add configuration options common to all sub-projects/modules.buildscript {repositories {jcenter()maven {url 'https://maven.google.com/'name 'Google'}}dependencies {classpath 'com.android.tools.build:gradle:3.1.2'// NOTE: Do not place your application dependencies here; they belong// in the individual module build.gradle files}
}allprojects {repositories {jcenter()google()}
}task clean(type: Delete) {delete rootProject.buildDir
}//Android Studio统一管理依赖版本号引用配置
ext {//修改compileSdkVersion并不会影响我们的我们生成的app在手机先的行为。最理想的情况就是把compileSdkVersion设置到最高。globalCompileSdkVersion = 27//构建工具的版本号是多少，规则是可以用高的构建工具来构建低版本Sdk的工程。使用build-tools目录中的最大版本号即可globalBuildToolsVersion = "27.0.3"//targetSdkVersion的设置主要是当系统版本高于设置的target的时候。然后targetSdkVersion最好和compileSdkVersion一样。globalTargetSdkVersion = 27//这个就是程序运行的最低的要求的Sdk版本号，在低于这个版本号的手机设备上无法安装。globalMinSdkVersion = 16supportLibraryVersion = "27.1.1"/*=================================常用的引用============================================*///supportLibVersion 的头数字是和targetSdkVersion 版本一样的。androidDependencies = [appcompat_v7 : "com.android.support:appcompat-v7:${supportLibraryVersion}",design        : "com.android.support:design:${supportLibraryVersion}",support_v4    : "com.android.support:support-v4:${supportLibraryVersion}",recyclerView : "com.android.support:recyclerview-v7:${supportLibraryVersion}",]/*=================================module中公共用到的引用============================================*/globalDependencies = [//constraintLayout引用constraintLayout : "com.android.support.constraint:constraint-layout:1.1.2",//glide的引用glide : "com.github.bumptech.glide:glide:4.7.1",]
}

apply plugin: 'com.android.application'android {compileSdkVersion rootProject.ext.globalCompileSdkVersiondefaultConfig {applicationId "com.why.project.androidcnblogsdemo"minSdkVersion rootProject.ext.globalMinSdkVersiontargetSdkVersion rootProject.ext.globalTargetSdkVersionversionCode 1versionName "1.0"testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"}buildTypes {release {minifyEnabled falseproguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'}}
}dependencies {implementation fileTree(dir: 'libs', include: ['*.jar'])implementation androidDependencies.appcompat_v7implementation globalDependencies.constraintLayouttestImplementation 'junit:junit:4.12'androidTestImplementation 'com.android.support.test:runner:1.0.2'androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'}