android { compileSdkVersion 28 buildToolsVersion "27.0.3" .... allprojects { repositories { jcenter() maven { url "https://maven.google.com" } } } // repositories { maven { url "https://maven.google.com" } } } 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-v7:28.+' testCompile 'junit:junit:4.12' }在build.gradle添加
allprojects { repositories { jcenter() maven { url "https://maven.google.com" } } }