photoview添加依赖时候遇到的坑

今天在添加photoview时候遇到了gradle的诡异报错

Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.

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Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.github.chrisbanes:PhotoView:2.1.4.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support.test

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