Android 标题栏，状态栏放置一个ProgressBar

首先要注意：分清哪个是标题栏，哪个是状态栏，记住最顶部显示时间的就是状态栏

关于标题栏显示 ProgressBar :

public class TestProgressBarInTitleBarActivity extends Activity {

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

requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); //注意要在setContentView方法之前设置
setContentView(R.layout.main);

// attention here!!!
setProgressBarIndeterminateVisibility(true); //控制显示与隐藏
}
}

关于状态栏显示 ProgressBar: