错误：程序类型已存在：Android.arch.Lifecycle.LiveData

Question

Error:Program type already present: android.arch.lifecycle.LiveData

以下是我的应用程序的app/build.gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    buildToolsVersion '27.0.3'
    defaultConfig {
        applicationId "com.edricchan.studybuddy"
        minSdkVersion 24
        targetSdkVersion 27
        versionCode 8
        versionName "1.0.0-rc.503"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        resConfigs "en"
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    dataBinding {
        enabled = true
    }
}

dependencies {
    implementation 'com.android.support:support-v4:27.1.0'
    implementation 'com.android.support:support-annotations:27.1.0'
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    implementation 'com.android.support:appcompat-v7:27.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    implementation 'com.android.support:design:27.1.0'
    implementation 'com.android.support:cardview-v7:27.1.0'
    testImplementation 'junit:junit:4.12'
    // Firebase stuff
    implementation 'com.google.firebase:firebase-storage:11.8.0'
    implementation 'com.google.firebase:firebase-firestore:11.8.0'
    implementation 'com.google.firebase:firebase-auth:11.8.0'
    implementation 'com.google.firebase:firebase-messaging:11.8.0'
    implementation 'com.google.android.gms:play-services-auth:11.8.0'
    implementation 'com.firebaseui:firebase-ui-auth:3.1.0'
    implementation 'com.firebaseui:firebase-ui-firestore:3.1.0'
    implementation 'com.firebaseui:firebase-ui-storage:3.1.0'
    // Provide a way to update the app
    implementation 'com.github.javiersantos:AppUpdater:2.6.4'
    // Chrome Custom Tabs
    implementation 'com.android.support:customtabs:27.1.0'
    // The app's intro screen
    implementation 'com.heinrichreimersoftware:material-intro:1.6.2'
    // Use for new Material Text field boxes recently introduced
    implementation 'com.github.HITGIF:TextFieldBoxes:1.3.7'
    // Report an issue to Github without having to open a new tab and so on...
    implementation 'com.heinrichreimersoftware:android-issue-reporter:1.3.1'
}
apply plugin: 'com.google.gms.google-services'

Answer 1

显然，这是有意的行为：

firebaseui:firebase-ui-firestore:3.1.0依赖于Android.arch.Lifecycle:extensions:1.0.0-beta1。切换到3.2.2版本可以通过使用支持库27.1.0的Lifecycle1.1库来解决这个问题。-问题跟踪器

对我来说，删除firebase-ui依赖项解决了这个问题，因为我一开始甚至没有使用这个库。