Android Studio中Gradle同步失败求助，已尝试Stack Overflow方案无效

Hey there, let's work through your Gradle sync failure step by step. Looking at your configuration, there are a few key mismatches and inconsistencies that are likely causing the problem. Here's what you need to adjust:

1. Update Android Gradle Plugin & Gradle Version #

Your current Android Gradle plugin (com.android.tools.build:gradle:2.3.3) is too old to support compileSdkVersion 27—plugin version 2.3.x only supports up to API 26. You'll need to upgrade both the plugin and its corresponding Gradle version:

• Modify your project-level build.gradle to use a plugin version compatible with API 27 (we'll use stable version 3.0.1 here):

  buildscript {
      repositories {
          google() // Add Google's Maven repository as the first entry
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.0.1'
          classpath 'com.google.gms:google-services:4.0.1' // Updated to match Firebase 11.8.0
      }
  }
  

• Open your gradle/wrapper/gradle-wrapper.properties file and set the Gradle version to 4.1 (matches plugin 3.0.1):

  distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
  

2. Unify Support Library Versions #

All support library dependencies must use the same version to avoid conflicts. You have appcompat-v7:27.0.3 but design:27.3.1—let's align them to a stable, matching version (27.1.1):

In your module-level build.gradle, update the support dependencies:

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:27.1.1'
    compile 'com.android.support.constraint:constraint-layout:1.1.3' // Updated to stable constraint-layout version
    compile 'com.android.support:design:27.1.1'
    // FireBase
    compile 'com.firebase:firebase-client-android:2.3.1'
    compile 'com.google.firebase:firebase-messaging:11.8.0'
    compile 'com.google.firebase:firebase-core:11.8.0'
    testCompile 'junit:junit:4.12'
}

3. Clean Up Repository Configurations #

• Replace HTTP URLs with HTTPS for JCenter (HTTP is deprecated and may cause connection issues)
• Simplify your repository list to avoid redundant entries:

Update your project-level allprojects block:

allprojects {
    repositories {
        google() // Prioritize Google's repository
        jcenter()
        mavenCentral()
    }
}

4. Final Sync Steps #

After making these changes:

• Click File > Sync Project with Gradle Files in Android Studio
• If errors persist, try Build > Clean Project followed by Build > Rebuild Project

These adjustments should resolve the version mismatches and repository issues causing your Gradle sync failure.

内容的提问来源于stack exchange，提问作者HIBO