Gradle build in Android Studio

Question

I updated my Android Studio to version 3.0.1, and then Gradle to 4.2 and Android plugin tools to 3.0.1. After that whenever I create a new project it gives me the Gradle build problem. This is my module build.gradle:

android {
compileSdkVersion 27
buildToolsVersion "27.0.3"

defaultConfig {
    applicationId "com.nasser.studio.test"
    minSdkVersion 14
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  }
}

dependencies {
   compile  fileTree(dir: 'libs', include: ['*.jar'])
   testCompile 'junit:junit:4.12'
   compile  'com.android.support:appcompat-v7:27.0.3'
}

Also I unchecked the work offline for gradle.

I also checked AS settings which displays some errors:

Update 1: When I change the compile SDK to version 25 like this, the Gradle build is completed correctly.

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion '27.0.3'

    defaultConfig {
        applicationId "com.nasser.studio.test"
        minSdkVersion 14
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    implementation 'com.android.support:appcompat-v7:25.3.1'
}

But changing to latest versions (26 or 27), it gives me the same error. I also should mention that during Gradle build process for these versions, it's downloading files from Maven repositories which doesn't happen in version 25 ( I'm using a proxy connection).

Moreover, the search box of AS for support library gives me this version which is not the latest version (27.0.2).

Answer 1

Add this to your project level build.gradle file:

allprojects {
repositories {
    maven {
        url 'https://maven.google.com'
    }
}
}

Answer 2

Change this on your Project level build.gradle

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

Answer 3

You should use stable v7:27.0.2 instead off v7:27.0.3 .

implementation "com.android.support:appcompat-v7:27.0.2"

FYI

If you are using Android Studio 3.0 or above make sure , your build.gradle (PROJECT level) file looks like this:

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

Then Clean-Rebuild-Run .

Answer 4

first, check with your gradle-wrapper.properties which should be having this

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

and in project-level build.gradle

build script {
    repositories {
        ...
        // You need to add the following repository to download the
        // new plugin.
        google()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
    }
}

also you need to change according this https://developer.android.com/studio/build/gradle-plugin-3-0-0-migration.html#new_configurations

and see the topic Migrate dependency configurations for local modules you will get better idea what things need to change in dependencies.