// file: android/settings.gradle
...
 
include ':react-native-exoplayer'
project(':react-native-exoplayer').projectDir = new File(settingsDir, '../node_modules/react-native-exoplayer/android')

// file: android/app/build.gradle
...
 
dependencies {
    ...
    implementation project(':react-native-exoplayer')
}

// file: android/app/src/main/java/com/<...>/MainApplication.java 
...
 
import com.ngager.videoplayer.VideoPlayerPackage; // <-- add this import 
 
public class MainApplication extends Application implements ReactApplication {
    @Override
    protected List<ReactPackage> getPackages() {
        return Arrays.<ReactPackage>asList(
            new MainReactPackage(),
            new VideoPlayerPackage() // <-- add this line 
        );
    }
...
}