Failed to resolve: android.arch.lifecycle:runtime:1.0.0，Failed to resolve: support-v4

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

解決方法：

1、點選第二行：   Add Google Maven repository and sync project

2、打開項目build.gradle，找到repositories

将

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