爱谁谁，反正没人看

ext {
    SUPPORT_LIBRARY_VERSION = '26.1.0'
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation "com.android.support:appcompat-v7:${SUPPORT_LIBRARY_VERSION}"
    implementation "com.android.support:design:${SUPPORT_LIBRARY_VERSION}"
    implementation "com.android.support:support-vector-drawable:${SUPPORT_LIBRARY_VERSION}"
}

注意implementation后面是双引号！！！