MainActivity.java in app module for Android App Bundle

MainActivity.java in app module

// Global instance of SplitInstallManager, needed to send the request to download the required module(s)
private SplitInstallManager splitInstallManager = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Instantiate an instance of SplitInstallManager for the dynamic feature module
        splitInstallManager =
                SplitInstallManagerFactory.create(getApplicationContext());
}

public void loadFeatureOne() {            
            // Builds a request to install the feature1 module
            SplitInstallRequest request =
                    SplitInstallRequest
                            .newBuilder()
                            // You can download multiple on demand modules per
                            // request by invoking the following method for each
                            // module you want to install.
                            .addModule("feature1")
                            .build();

            // Begin the installation of the feature1 module and handle success/failure
            splitInstallManager
                    .startInstall(request)
                    .addOnSuccessListener(new OnSuccessListener<Integer>() {
                        @Override
                        public void onSuccess(Integer integer) {
                            // Module download successful 
                        }
                    })
                    .addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(Exception e) {
                            // Module download failed; handle the error here
                        }
                    });
}