How to hide Notification Panel after sending a PendingIntent to Service in a notification

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I write a service to to update system state, and I use startForeground to put the service to foreground, also adding a notification to it. In the notification, I

Answer 1

find my question answered in other place:
1. Android: How to collapse status bar on android 4.2? 2. Preventing status bar expansion

first, add use permission lines to AndroidManifest.xml

<uses-permission android:name="android.permission.EXPAND_STATUS_BAR"/>

second, use following codes to make it work:

try
{
    Object service  = getSystemService("statusbar");
    Class<?> statusbarManager = Class.forName("android.app.StatusBarManager");
    if (Build.VERSION.SDK_INT <= 16) 
    {
        Method collapse = statusbarManager.getMethod("collapse");
        collapse.setAccessible(true);
        collapse.invoke(service);
    } 
    else 
    {
        Method collapse2 = statusbarManager.getMethod("collapsePanels");
        collapse2.setAccessible(true);
        collapse2.invoke(service);
    }
}catch(Exception ex){}

it's hacky, but it did work.