I want to know how to change YouTube thumbnail dynamically using Android YouTube api

public class LinkDialog extends Dialog implements YouTubeThumbnailView.OnInitializedListener{

private String VIDEO_ID = "fqGSJVmX9Jw";

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState); 

  youTubeThumbView = (YouTubeThumbnailView) findViewById(R.id.youtube_dialog_tv);
        youTubeThumbView.initialize(API_KEY, this);


//Add button
addBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //linkTxt is the address value entered by the user
                linkTxt = linkEt.getText().toString();
                // Link extraction
                thumbnailTxt = linkTxt.split("/");

                // You tried to change the thumbnail here. But there is no mediating factor for the onInitializationSuccess method
                youTubeThumbnailLoader.setVideo(thumbnailTxt[2]);

        });


 @Override
    public void onInitializationSuccess(YouTubeThumbnailView thumbnailView, YouTubeThumbnailLoader thumbnailLoader) {
        youTubeThumbnailLoader = thumbnailLoader;
        thumbnailLoader.setOnThumbnailLoadedListener(new ThumbnailLoadedListener());

        //You are always loading the thumbnail of VIDEO_ID
        youTubeThumbnailLoader.setVideo(VIDEO_ID);

    }

    @Override
    public void onInitializationFailure(YouTubeThumbnailView youTubeThumbnailView, YouTubeInitializationResult youTubeInitializationResult) {

    }

    private final class ThumbnailLoadedListener implements  YouTubeThumbnailLoader.OnThumbnailLoadedListener {

        @Override
        public void onThumbnailError(YouTubeThumbnailView arg0, YouTubeThumbnailLoader.ErrorReason arg1) {

        }

        @Override
        public void onThumbnailLoaded(YouTubeThumbnailView arg0, String arg1) {

        }

    }