Could not find appcompat-v7.aar (com.android.support:appcompat-v7:26.1.0).

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Could not resolve all files for configuration ':app:debugCompileClasspath'.
> Could not find appcompat-v7.aar (com.android.support:appcompat-v7:26.1.0).
  Searched in the following locations:
      https://jcenter.bintray.com/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.aar
> Could not find support-v4.aar (com.android.support:support-v4:26.1.0).
  Searched in the following locations:
      https://jcenter.bintray.com/com/android/support/support-v4/26.1.0/support-v4-26.1.0.aar
> Could not find support-fragment.aar (com.android.support:support-fragment:26.1.0).
  Searched in the following locations:
      https://jcenter.bintray.com/com/android/support/support-fragment/26.1.0/support-fragment-26.1.0.aar
> Could not find animated-vector-drawable.aar (com.android.support:animated-vector-drawable:26.1.0).
  Searched in the following locations:
      https://jcenter.bintray.com/com/android/support/animated-vector-drawable/26.1.0/animated-vector-drawable-26.1.0.aar
> Could not find support-vector-drawable.aar (com.android.support:support-vector-drawable:26.1.0).
  Searched in the following locations:
      https://jcenter.bintray.com/com/android/support/support-vector-drawable/26.1.0/support-vector-drawable-26.1.0.aar
> Could not find support-core-ui.aar (com.android.support:support-core-ui:26.1.0).
  Searched in the following locations:
      https://jcenter.bintray.com/com/android/support/support-core-ui/26.1.0/support-core-ui-26.1.0.aar

加上这一句就好了