I can only resolve dependencies if I use '+' in the versions of the Libraries

22 Dec 2017 Error that occurred while offline

AfterswitchingtoOnlineWork

ORIGINAL:I'vebeentryingtoavoiddoingitthisway:

dependencies{compilefileTree(include:['*.jar'],dir:'libs')compile'com.android.support:appcompat-v7:26.+'

Becausetheuseof'+'isdiscouraged,Gradlecannever'resolvedependencies'ifIuse

...v7:26.1.1ouv7:27.0.2(comosdevidosajustes)

oranyotherversionyoumayfindontheweb.

IputdownthecompletecodeoftheAppbuild.gradle(in1st)andthebuild.gradleoftheproject(in2nd).

Iask:a)HowdoIavoid'+'?b)WherecanIfindtheversions(26.x.x,forexample)thatexistandcanbecompiled?

applyplugin:'com.android.application'android{compileSdkVersion26//23buildToolsVersion'26.0.3'defaultConfig{applicationId"com.example.android.LearnEnglish"
        minSdkVersion 15
        targetSdkVersion 26//23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

repositories {
    jcenter()
    google()
    //maven { url "https://maven.google.com" } Este só se usa com Gradle abaixo de 4.1
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:26.+'
    //compile 'com.android.support:support-v4.app.ActivityCompat'//com.android.support:support-compat:+'
    //compile 'com.android.support:support-v4:23.3.0'
    //compile 'com.android.support:design:23.3.0'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
    /*compile fileTree(dir: 'libs', include: ['*.jar'])
        compile 'com.android.support:appcompat-v7:23.3.0'
        compile 'com.android.support:support-v4:23.3.0'
        compile 'com.android.support:design:23.3.0'
        compile 'com.android.support.constraint:constraint-layout:1.0.2'
        testCompile 'junit:junit:4.12'*/
}

(project:)

buildscript {
    repositories {
        // Gradle 4.1 and higher include support for Google's Maven repo using
        // the google() method. And you need to include this repo to download
        // Android plugin 3.0.0 or higher.
        jcenter()
        google()

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

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

allprojects {
    repositories {
        jcenter()
        google()


    }
}

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