Android studio 導入項目報錯：

Failed to resolve: com.android.support:support-core-ui:26.1.0
Add Google Maven repository and sync project
Open File
Show in Project Structure dialog

Failed to resolve: android.arch.lifecycle:runtime:1.0.0
Open File
Show in Project Structure dialog

Failed to resolve: support-v4
Open File
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解決方法：

1、點擊第二行： ? Add Google Maven repository and sync project

2、打開項目build.gradle，找到repositories

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將

repositories {jcenter() }

改為

repositories {mavenCentral()//如果 jcenter 很慢，嘗試添加 mavenCentral 并調整到首行jcenter() // maven { url 'https://maven.google.com' }maven { url "https://jitpack.io" }maven { url "https://raw.githubusercontent.com/HyphenateInc/Hyphenate-SDK-Android/master/repository" }google()}

同步即可

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