https://stackoverflow.com/questions/50891617/failed-to-resolve-recyclerview-v7
apply plugin: 'com.android.application' android { compileSdkVersion 27 defaultConfig { applicationId "com.someapp" minSdkVersion 16 targetSdkVersion 27 versionCode 1 versionName "1.0" vectorDrawables.useSupportLibrary = true } 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.constraint:constraint-layout:1.1.2' implementation 'com.google.firebase:firebase-crash:16.0.1' implementation 'com.android.support:design:27.1.1' implementation 'com.squareup.retrofit2:retrofit:2.1.0' implementation 'com.squareup.retrofit2:converter-gson:2.1.0' implementation 'com.squareup.okhttp3:logging-interceptor:3.3.1' implementation 'com.commonsware.cwac:saferoom:0.4.1' implementation 'com.squareup.picasso:picasso:2.5.2' implementation 'com.android.support:cardview-v7:27.1.1' } apply plugin: 'com.google.gms.google-services'