trkpt/build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
    project.ext {
        applicationId = 'org.y20k.trackbook'
        versionCode = 11
        versionName = '1.0.4 (Astronomy Domine)'
        minSdkVersion = 22
        // Android N - release
        compileSdkVersion = 25
        targetSdkVersion = 25
        buildToolsVersion = '25.0.3 '
        supportLibraryVersion = '25.4.0'
        // Android O - test
//        compileSdkVersion = 26
//        targetSdkVersion = 26
//        buildToolsVersion = '26.0.0'
//        supportLibraryVersion = '26.0.0-beta2'
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}