app/build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    defaultConfig {
        applicationId "com.stone.gradle_explore"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }


    signingConfigs {
        release {
            storeFile file("stone.keystore")
            keyAlias "$alias"
            keyPassword "$kpwd"
            storePassword "$spwd"
        }
    }

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

/**
 * 编译或者安装命令, 有下列组合:
 * ./gradlew -Pbt=0 :app:assembleDebug      //打debug包, library用debug模式打包
 * ./gradlew -Pbt=1 :app:assembleDebug      //打debug包, library用release模式打包
 * ./gradlew -Pbt=0 :app:assembleRelease    //打release包, library用debug模式打包
 * ./gradlew -Pbt=1 :app:assembleRelease    //打release包, library用release模式打包
 * ./gradlew -Pbt=0 :app:installDebug       //安装debug包, library用debug模式打包
 * ./gradlew -Pbt=1 :app:installDebug       //安装debug包, library用release模式打包
 * ./gradlew -Pbt=0 :app:installRelease     //安装release包, library用debug模式打包
 * ./gradlew -Pbt=1 :app:installRelease     //安装release包, library用release模式打包
 */

//1. 获取命令行额外参数(bt)传入的buildType
String getBuildType() {
    //为了简化输入(debug/release): bt=0 表示buildType为debug; bt=1 表示buildType为release
    String buildTypeI =  hasProperty("bt") ? "$bt" : "0"  //如果不传buildType传输, library默认使用debug模式打包
    return buildTypeI.equals("1") ? "release" : "debug"
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'

    compile project(':library', { pj ->
        //2. 将命令行指定的buildType设置给library
        pj.ext.buildType = getBuildType()
    })
}