appcompat-v7:27.1.1 conflicts with play-services:11.0.1

问题

I am working on a new app. Presently I am trying to add dependency.

implementation 'com.google.android.gms:play-services:11.0.1'

When I do I get a gradle compile error on implementation 'com.android.support:appcompat-v7:27.1.1' saying:

All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 27.1.1, 26.1.0. Examples include com.android.support:animated-vector-drawable:27.1.1 and com.android.support:mediarouter-v7:26.1.0

Any ideas how to best resolve this issue?

Gradle file

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.example.boulbabazitouni.getdevicelocation_time"
        minSdkVersion 21
        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'
        }
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support:support-vector-drawable:27.1.1'
    implementation 'com.android.support:mediarouter-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.google.android.gms:play-services:11.0.1'
}

回答1:

The problem is that you have some transient dependencies in this libraries. Whenever this happens you can explicitly add the conflicting dependencies and match them with your current version:

implementation 'com.android.support:animated-vector-drawable:27.1.1'
implementation 'com.android.support:mediarouter-v7:27.1.1'
implementation 'com.android.support:support-v4:27.1.1'

来源：https://stackoverflow.com/questions/50565219/appcompat-v727-1-1-conflicts-with-play-services11-0-1