Build error android studio 3.1

Question

I'm experiencing error while loading fresh new template project after updating Android Studio to 3.1.

Tried with and without this option, but no use:

maven {
    url "https://maven.google.com"
}

during build, I'm seeing following messages:

Caused by: org.gradle.internal.resolve.ModuleVersionResolveException:
           Could not resolve com.android.tools.build:gradle:3.1.0.
<6 internal calls>
   ... 128 more
Caused by: org.gradle.api.resources.ResourceException:
           Could not get resource 'https://dl/google.com/dl/android/maven2/com/android/tools/build/gradle/3.1.0/gradle-3.1.0.pom' <21 internal calls>
   ... 133 more
Caused by: org.gradle.internal.resource.transport.http.HttpRequestException:
           Could not GET 'https://dl/google.com/dl/android/maven2/com/android/tools/build/gradle/3.1.0/gradle-3.1.0.pom'. <16 internal calls>
Caused by: org.apache.http.conn.HttpHostConnectException: Connect to dl.google.com:433 [dl.google.com/216.58.199.142] failed

build.gradle

apply plugin: 'com.android.application'

android {
  compileSdkVersion 27
  buildToolsVersion "27.0.3"
  defaultConfig {
    applicationId "com.example.am.myapplicationtest"
    minSdkVersion 19
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    //testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
  }
  buildTypes {
    release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  }

Screenshots for reference:

Gradle setting

Answer 1

This is a network issue

I think your problem is caused by bad network, since:

Caused by: org.apache.http.conn.HttpHostConnectException:
Connect to dl.google.com:433 [dl.google.com/216.58.199.142] failed

I face a similar problem, and at last I found the root cause is the default proxy of gradle(NOT for Android Studio but for gradle!)

I defined my own proxy settings in gradle.properties, but when I click sync in Android Studio, my settings does not apply and result in a error like this:

Error:Failed to resolve: com.android.support:appcompat-v7:27.0.1
Install Repository and sync project
Open File
Show in Project Structure dialog

Solution

At last I solved my problem by build my application by command line and set proxy myself, like this:

gradlew -Dhttp.proxyHost=127.0.0.1 -Dhttp.proxyPort=3128 -Dhttps.proxyHost=127.0.0.1 -Dhttps.proxyPort=3129

Get this from Gradle proxy configuration, Thanks to Guillaume Berche.