1. Update the "project level" gradle file.

allprojects {
   repositories {
       maven {
            url 'https://maven.speedcheckerapi.com/artifactory/libs-release'
            credentials {
                username = "demo"
                password = "AP85qiz6wYEsCttWU2ZckEWSwJKuA6mSYcizEY"
            }
       }
   }
}

2. Update the "app level" gradle file.

implementation 'com.speedchecker:android-sdk:4.2.256'

3. Initialize SpeedcheckerSDK inside a main activity.

public void onCreate() {
  super.onCreate();
  SpeedcheckerSDK.init(this);
}

4. Ask Location permissions.

SpeedcheckerSDK.askPermissions(this);

5. Implement the "SpeedTestListener" interface and override methods (an example below shows a new class with overriding methods but you could implement the interface at "MainActivity" or somewhere else).

import com.speedchecker.android.sdk.Public.SpeedTestListener;

public class SpeedTestCallbacks implements SpeedTestListener {
   @Override
   public void onTestStarted() {
         //your code here
   }
   @Override
   public void onFetchServerFailed() {
         //your code here
   }
   //… other methods here
}

6. Set implemented interface.

SpeedcheckerSDK.SpeedTest.setOnSpeedTestListener(new SpeedTestCallbacks());
OR 
SpeedcheckerSDK.SpeedTest.setOnSpeedTestListener(this);

7. Start Speed test.

SpeedcheckerSDK.SpeedTest.startTest(this);

8. License Key setup in main application class(optional)

class MainApplication : Application() {
    override fun onCreate() {
        super.onCreate()
        SpeedcheckerSDK.setLicenseKey(this, "Insert your key here")
    }
}

9. That's it. Enjoy!