我正在尝试在我的项目中添加firebase,但是当我实现’com.google.firebase：firebase-messaging：19.0.0’和’com.google.firebase：firebase-core：17.0.0’时.

build.gradle(这是错误)

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'

android {
 compileSdkVersion 28
 defaultConfig {
    applicationId "com.example.user.mikripoli"
    minSdkVersion 15
    targetSdkVersion 28
    multiDexEnabled true
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner 
 "android.support.test.runner.AndroidJUnitRunner"
 }
 buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 
 'proguard-rules.pro'
    }
 }

 dexOptions {
    javaMaxHeapSize "2g"
 }
}

dependencies {
 implementation 'com.roughike:bottom-bar:2.0'
 implementation 'com.android.support:support-v4:28.0.0'
 implementation 'com.android.support:exifinterface:28.0.0'
 implementation 'com.android.support:animated-vector-drawable:28.0.0'
 implementation 'com.flaviofaria:kenburnsview:1.0.7'
 implementation fileTree(include: ['*.jar'], dir: 'libs')
 implementation 'com.android.support:appcompat-v7:28.0.0'
 implementation 'com.android.support.constraint:constraint-layout:1.1.3'
 implementation 'com.android.support:design:28.0.0'
 implementation 'com.github.chrisbanes:PhotoView:2.1.4'
 implementation 'com.google.firebase:firebase-messaging:19.0.0'
 implementation 'com.google.firebase:firebase-core:17.0.0'
 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.android.support:recyclerview-v7:28.0.0'
 implementation 'com.android.support:cardview-v7:28.0.0'
 implementation "com.google.android.gms:play-services-location:17.0.0"
 implementation 'com.google.android.gms:play-services-maps:17.0.0'
 implementation 'com.google.android.gms:play-services-base:17.0.0'
 implementation 'com.github.ahmedshaban1:EasySlider:1.0.0'
 implementation 'com.liangfeizc:SlidePageIndicator:1.1.0@aar'
 implementation 'me.relex:circleindicator:1.2.2@aar'
 implementation 'com.github.bumptech.glide:glide:4.8.0'
 annotationProcessor 'com.github.bumptech.glide:compiler:4.8.0'

}

另一个gradle文件：

buildscript {

 repositories {
    google()
    jcenter()
 }
 dependencies {
    classpath 'com.android.tools.build:gradle:3.4.1'
    classpath 'com.google.gms:google-services:4.2.0'


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

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

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

显示有关com.android.support:support-v4:28.0.0的错误：

Dependencies using groupId com.android.support and androidx.* can not
be combined but found
IdeMavenCoordinates{myGroupId=’com.android.support’,
myArtifactId=’cardview-v7′, myVersion=’28.0.0′, myPacking=’aar’,
myClassifier=’null’} and
IdeMavenCoordinates{myGroupId=’androidx.coordinatorlayout’,
myArtifactId=’coordinatorlayout’, myVersion=’1.0.0′, myPacking=’aar’,
myClassifier=’null’} incompatible dependencies

Inspection info:There are some combinations of libraries, or tools and
libraries, that are incompatible, or can lead to bugs. One such
incompatibility is compiling with a version of the Android support
libraries that is not the latest version (or in particular, a version
lower than your targetSdkVersion).

此外,当我构建apk时,它显示此错误：

Manifest merger failed : Attribute application@appComponentFactory
value=(android.support.v4.app.CoreComponentFactory) from
[com.android.support:support-compat:28.0.0]
AndroidManifest.xml:22:18-91 is also present at
[androidx.core:core:1.0.0] AndroidManifest.xml:22:18-86
value=(androidx.core.app.CoreComponentFactory). Suggestion: add
‘tools:replace=”android:appComponentFactory”‘ to element
at AndroidManifest.xml:13:5-354:19 to override.

adding tools:replace=”android:appComponentFactory” doesn’t work though

解决方法:

随着新版本的发布,库将从Android支持库迁移到Jetpack(AndroidX)库.

除非您在应用中进行以下更改,否则更新的库将无法运行：

>将com.android.tools.build:gradle升级到v3.2.1或更高版本.
>将compileSdkVersion升级到28或更高版本.
>更新您的应用程序以使用Jetpack(AndroidX);按照Migrating to AndroidX中的说明操作.

方法-1：

将这两个添加到gradle.properties文件中,不进行任何更新

android.useAndroidX=true
android.enableJetifier=true

方法2

如果Method-1无法解决您的问题
做一件事
如果您使用的是android studio 3.2或更高版本
转到Refactor>迁移到AndroidX …