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Android Threads and Services Threads in Android Extending Thread

Why can't the editor understand Thread.sleep?

I'm not sure what I'm doing wrong, but the fact that I can't use Android Studio code in this editor is a bit frustrating.

The editor is saying that my code isn't right when it's the same code the teacher used.

public class MainActivity extends Activity {
    TwitterClient twitterClient = new TwitterClient();

    public void onCreate(Bundle savedInstanceState) {

      DownloadThread thread = new DownloadThread();


  public class DownloadThread extends Thread {

    public void run() {
        for (String song: Playlist.songs) {

    private void downloadSong() {
        long endTime = System.currentTimeMillis() + 10*1000;
        while (System.currentTimeMillis() < endTime) {
            try {
            } catch (InterruptedException e) {


I've added the missing Playlist.songs just as an array inside DownloadThread called "songs".