how to fix android.support and firebase error?

Question

this error occurred when I tried to set up my firebase with this project. after searching...I found a solution which after then both synced and build works fine and the app run on my device.

But the problem is that:

1. I don't understand which pair version of android.support and firebase to use.
2. though the app works fine it's still showing red underlined.

Thanks for the help.
build.gradle(project)

build.gradle(app)

AndroidManifest

build.gradle(app)

apply plugin: 'com.android.application'

 android {
compileSdkVersion 28
defaultConfig {
    applicationId "com.example.collegeapp"
    minSdkVersion 15
    targetSdkVersion 28
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}
compileOptions {
    sourceCompatibility = '1.8'
    targetCompatibility = '1.8'
  }
}

dependencies {
implementation 'com.google.firebase:firebase-analytics:15.0.0'
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
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'
}
 apply plugin: 'com.google.gms.google-services'

build.gradle(project)

buildscript {
repositories {
    google()
    jcenter()

}
dependencies {
    classpath 'com.android.tools.build:gradle:3.3.2'
    classpath 'com.google.gms:google-services:4.3.2'

    // 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
}

Answer 1

Try to use upgrade version of firebase-analtyics.

implementation 'com.google.firebase:firebase-analytics:16.0.0'

Answer 2

classpath 'com.google.gms:google-services:4.2.0'

implementation 'com.google.firebase:firebase-analytics:17.2.0'

I hope it helps