ERROR: Failed to resolve: com.android.support:support-v4:28.0.0
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        Affected Modules: app
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                    2Possible duplicate of [Failed to resolve: com.android.support:appcompat-v7:26.0.0](https://stackoverflow.com/questions/45357000/failed-to-resolve-com-android-supportappcompat-v726-0-0) – Ashish Aug 17 '19 at 11:43
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                    May post your build.gradle file. Meanwhile you can try: implementation 'com.android.support:appcompat-v7:28.0.0' – Daniel Spiess Aug 17 '19 at 12:16