Android(安卓)studio 统一管理依赖版本号

方式一（推荐）

1.在根目录下的build.gradle文件下添加 ext{ …. } 中的内容

buildscript {    repositories {        google()        jcenter()    }    dependencies {        classpath 'com.android.tools.build:gradle:3.0.1'        // NOTE: Do not place your application dependencies here; they belong        // in the individual module build.gradle files    }}allprojects {    repositories {        google()        jcenter()    }}task clean(type: Delete) {    delete rootProject.buildDir}ext{    //SDK    minSdkVersion = 15      targetSdkVersion = 26    compileSdkVersion = 26    //dependencies    supportLibraryVersion ='26.1.0'    butterknifeVersion = '8.8.1'}

注：在android studio3.0之后，buildToolsVersion去掉了，等号也别忘记了，要不然会报： Gradle DSL method not found: ‘minSdkVersion()’

2.在app目录下build.gradle中使用

apply plugin: 'com.android.application'android {    compileSdkVersion rootProject.ext.compileSdkVersion    defaultConfig {        applicationId "com.asialyf.zhiqu"        minSdkVersion rootProject.ext.minSdkVersion        targetSdkVersion rootProject.ext.targetSdkVersion        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }}dependencies {    implementation fileTree(dir: 'libs', include: ['*.jar'])    implementation "com.android.support:appcompat-v7:$rootProject.supportLibraryVersion"    implementation "com.android.support:cardview-v7:$rootProject.supportLibraryVersion"    implementation 'com.android.support.constraint:constraint-layout:1.0.2'    testImplementation 'junit:junit:4.12'    androidTestImplementation 'com.android.support.test:runner:1.0.1'    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'    //Butterknife    implementation "com.jakewharton:butterknife:$rootProject.butterknifeVersion"}

注意：引用的依赖使用的是双引号

方式二

1.在项目根目录下创建.gradle文件，如：config.gradle
2.在根目录下的build.gradle文件中引入创建的配置文件
apply from:”config.gradle”
3.最后config.gradle中文件内容可以自己定义

ext {      // 用于编译的SDK版本      COMPILE_SDK_VERSION = 23      // 用于Gradle编译项目的工具版本      BUILD_TOOLS_VERSION = "24.0.2"      // 最低支持Android版本      MIN_SDK_VERSION = 14      // 目标版本      TARGET_SDK_VERSION = 23      APPCOMPAT_VERSION = '23.2.1'  }

4.在app目录下的build.gradle中使用

dependencies {      compile fileTree(include: ['*.jar'], dir: 'libs')      compile "com.android.support:cardview-v7:${APPCOMPAT_VERSION}"      compile "com.android.support:appcompat-v7:${APPCOMPAT_VERSION}"      compile "com.android.support:design:${APPCOMPAT_VERSION}"      compile 'com.github.bumptech.glide:glide:3.7.0'  }

方式一（推荐）

方式二

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