标题栏progressbar不显示

Question

android在标题栏加了进度条，部署到真机上不显示
public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // 启用窗口特征,启用带进度和不带进度的进度条
    requestWindowFeature(Window.FEATURE_PROGRESS);
    requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
    setContentView(R.layout.activity_main);
    // 设置为true的时候是显示进度条
    setProgressBarVisibility(true);
    // 设置为true是设置显示不带进度的进度条
    setProgressBarIndeterminateVisibility(true);
    //Max=10000，缓冲完成可以设置为9999
    setProgress(600);//设置带进度条的进度
}

}