怎樣在標題欄中顯示進度條

import android.app.Activity;
import android.os.Bundle;
import android.view.Window;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//呼叫視窗有特徵，啟用標題欄中的進度條
requestWindowFeature(Window.FEATURE_PROGRESS); //顯示進度的進度條
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);//不顯示進度的模糊進度條

setContentView(R.layout.activity_main);
setProgress(500);//設定進度條的進度
setProgressBarIndeterminateVisibility(true);//設定模糊進度條是否可見
}
}