页面上现有ProgressBar控件progressBar，请用书写线程以10秒的的时间完成其进度显示工作。public class ProgressBarStu extends Activity {private ProgressBar progressBar = null;protected void onCreate(BundlesavedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.progressbar);progressBar = (ProgressBar)findViewById(R.id.progressBar);Thread thread = new Thread(newRunnable() {@Overridepublic void run() {}});thread.start();}}