无法解决：Android Studio中的com.android.support:design:26.2.0错误

Question

I am trying to follow a tutorial and it asks us to clone a project from GitHub. I have done this but when it runs in my Android Studio, I get two errors,

failed to resolve 'com.android.support:design:26.2.0'
failed to resolve 'com.android.support:appcompat-v7:26.2.0'

I have looked this up on Stackoverflow and seems a common question, but I don't seem to be able to get it to work.

my current gradle files look like this,

module gradle file,

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    defaultConfig {
        applicationId "com.example.android.emojify"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:design:25.2.0'
    compile 'com.android.support:appcompat-v7:25.2.0'
    testCompile 'junit:junit:4.12'
}

I know the sdkVersion needs changing as it says cannot be lower than 26, but I have reset to what was initially imported from github.

project gradle,

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {

        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()

    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

When I change the sdk etc to 26 I get the error,

Failed to resolve: com.android.support:design:26.2.0

Failed to resolve: com.android.support:appcompat-v7:26.2.0

I have read on here about adding in,

maven {
    url "www.maven.google.com"
}

This doesn't seem to make any difference though.

Answer 1

Failed to resolve: com.android.support:design:26.2.0

Failed to resolve: com.android.support:appcompat-v7:26.2.0

It's simply because the last version of support library 26 is version 26.1.0 . You better to use support library version 28.0.0 or either upgrading to AndroidX.