关于Android Studio的Unable to resolve dependency for ':app@debug/compileClasspath': Could not find any

Unable to resolve dependency for ':app@debug/compileClasspath': Could not find any matches for com.facebook.android:facebook-login:[4,5) as no versions of com.facebook.android:facebook-login are available.
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Failed to resolve: com.squareup.okhttp3:okhttp:3.10.0
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这个问题处理起来很简单，直接修改build.gradle中allprojects的就行了，然后重新Sync一下轻松解决，修改结果如下：

allprojects {
   repositories {
      flatDir {
        dirs 'libs'
      }
	   google()
	   mavenCentral()
	   jcenter()
   }
}