add dependacy

 

    implementation 'com.google.code.gson:gson:2.8.5'

    implementation 'com.squareup.retrofit2:retrofit:2.5.0'

    implementation 'com.google.android.gms:play-services-ads:18.3.0'

    implementation 'com.squareup.retrofit2:converter-gson:2.5.0'

    implementation 'com.squareup.retrofit2:converter-scalars:2.5.0'

    implementation 'com.squareup.okhttp3:logging-interceptor:3.8.0'

    implementation 'com.squareup.okhttp3:okhttp:3.12.0'

    implementation 'pl.droidsonroids.gif:android-gif-drawable:1.2.19'

    implementation 'com.squareup.okhttp3:logging-interceptor:3.3.1'