dependencies for Retrofit and Picasso for image loading

build.gradle

dependencies {
    ...

    compile "com.android.support:cardview-v7:26.1.0"
    compile 'com.android.support:recyclerview-v7:26.1.0'
    compile 'com.squareup.picasso:picasso:2.5.2'

    compile 'com.squareup.retrofit2:retrofit:2.3.0'
    compile 'com.squareup.retrofit2:converter-gson:2.3.0'
    compile 'com.jakewharton.picasso:picasso2-okhttp3-downloader:1.1.0'
  
    ...
}