【Android Studio】Gradle统一管理版本号引用配置

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

  ......
// Define versions in a single place
ext {
    // SDK And Tools
    compileSdkVersion = 25
    buildToolsVersion = "25.0.0"

    minSdkVersion = 16
    targetSdkVersion = 25

    versionCode = 1
    versionName = "1.0"
}
  ......

2.在app目录下build.gradle中使用 $rootProject.supportLibraryVersion

apply plugin: 'com.android.application'  

android {
    compileSdkVersion rootProject.ext.compileSdkVersion
    buildToolsVersion rootProject.ext.buildToolsVersion  

    defaultConfig {
        applicationId 'com.mainiway.demo'
        minSdkVersion  rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName "1.0.0"
    }
}  

dependencies {
  ......
}