dont support androidx, and compile does not support now

[ShuaiJing]

Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'. It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html

Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:support-v4:26.1.0. Open File