Please fix the version conflict either by updating the version of the google-services plugin (information about the latest version is available at https://bintray.com/android/android-tools/com.google.gms.google-services/) or updating the version of com.google.android.gms to 11.8.0.
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.firebaseui:firebase-ui-database:1.2.0'
implementation 'com.squareup.picasso:picasso:2.5.2'
implementation 'com.google.firebase:firebase-core:10.2.0'
implementation 'com.google.firebase:firebase-database:10.2.0'
implementation'com.google.android.gms:play-services-ads:11.8.0'
implementation 'com.rengwuxian.materialedittext:library:2.1.4'
implementation 'com.android.support:design:26.1.0'
implementation 'com.android.support:appcompat-v7:26.+'
implementation 'com.android.support:cardview-v7:26.+'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'com.android.support:support-v4:26'
implementation 'com.google.firebase:firebase-ads:11.8.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:2.2.2'
}
apply plugin: 'com.google.gms.google-services'
See Question&Answers more detail:
os 与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…