問題
FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:preDebugBuild'. > Android dependency 'com.android.support:support-v4' has different version for the compile (26.1.0) and runtime (27.1.1) classpath. You should manually set the same version via DependencyResolution
2つのバージョンのclasspathがあるため衝突が起き,ビルド出来ない.
解決
build.gradleのsubprojectsに
project.configurations.all { resolutionStrategy.eachDependency { details -> if (details.requested.group == 'com.android.support') { details.useVersion "26.1.0" or "27.1.1" } } }
を追記するとバージョンを指定できる.