Failed to resolve: com.android.xxx Add Google Maven repository and sync project

问题描述

运行程序出现这种错误，导致程序无法执行。

	ERROR: Failed to resolve: com.android.support:appcompat-v7:26.1.0
	Add Google Maven repository and sync project
	Show in Project Structure dialog
	Affected Modules: app
	
	ERROR: Failed to resolve: com.android.support:design:26.1.0
	Add Google Maven repository and sync project
	Show in Project Structure dialog
	Affected Modules: app
	
	ERROR: Failed to resolve: com.android.support:recyclerview-v7:22.2.0
	Add Google Maven repository and sync project
	Show in Project Structure dialog
	Affected Modules: app
	
	ERROR: Failed to resolve: com.android.support:support-v4:21.0.3
	Add Google Maven repository and sync project
	Show in Project Structure dialog
	Affected Modules: app

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解决方法

在最外层build.gradle的allprojects闭包中加上maven路径：

	allprojects {
	    repositories {
	        jcenter()
	        maven {
	            url "https://maven.google.com"
	        }
	    }
	}

记住是在最外层的build.gradle，不是app下的build.gradle哦。

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