Android Application的Gradle说明

 //引入插件
 apply plugin: 'com.android.application'

 android {
     compileSdkVersion 29
     buildToolsVersion "29.0.0"
     defaultConfig {
         applicationId "com.example.myapplication"
         minSdkVersion 28
         targetSdkVersion 29
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
         release {
             minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
 }

 dependencies {
     //implementation定义项目主源代码的依赖

     //配置依赖libs目录下的所有jar包
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     //配置从中央仓库下载依赖jar包
     implementation 'androidx.appcompat:appcompat:1.0.2'
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     //testImplementation定义项目测试代码（test目录下的代码）的依赖
     testImplementation 'junit:junit:4.12'
     //androidTestImplementation定义androidTest目录下的代码依赖
     androidTestImplementation 'androidx.test:runner:1.2.0'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
 }