apply plugin: 'com.android.application' android { compileSdkVersion 25 defaultConfig { applicationId "io.hsiao.lesson01" minSdkVersion 19 targetSdkVersion 25 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } buildToolsVersion '26.0.2' compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } } dependencies { implementation fileTree(include: ['*.jar'], dir: 'libs') implementation 'com.android.support:appcompat-v7:25.1.0' implementation 'com.android.support.constraint:constraint-layout:1.0.2' }