问题
I have these two errors:
Failed to resolve: com.android.support:custom tabs:[26.0.0,26.1.0]
Failed to resolve: com.android.support:support-v4:[26.0.0,26.1.0]

回答1:
Now Android support package disturbs over network(starts from 25.4), so your project's build.gradle file should include that:
allprojects {
repositories {
jcenter()
maven {
url "https://maven.google.com"
}
}
}
UPDATE
Also you can add google()
instead of maven{url "..."}
:
allprojects {
repositories {
jcenter()
google()
}
}
来源:https://stackoverflow.com/questions/45649426/failed-to-resolve-com-android-supportcustomtabs26-0-0-26-1-0