buildscript { repositories { jcenter() } } apply plugin: 'com.android.library' android { compileSdkVersion 27 buildToolsVersion '27.0.3' defaultConfig { minSdkVersion 18 targetSdkVersion 26 } buildTypes { release { zipAlignEnabled true minifyEnabled true shrinkResources false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } }