Notification.Builder PendingIntent

设置FullScreenIntent：

/**
* An intent to launch instead of posting the notification to the status bar.
* Only for use with extremely high-priority notifications demanding the user's
* <strong>immediate</strong> attention, such as an incoming phone call or
* alarm clock that the user has explicitly set to a particular time.
* If this facility is used for something else, please give the user an option
* to turn it off and use a normal notification, as this can be extremely
* disruptive.
*
* @param intent The pending intent to launch.
* @param highPriority Passing true will cause this notification to be sent
*          even if other notifications are suppressed.
*/
public Builder setFullScreenIntent(PendingIntent intent, boolean highPriority) {
mFullScreenIntent = intent;
setFlag(FLAG_HIGH_PRIORITY, highPriority);
return this;
}

一个全屏状态下替代状态栏上的Notification的intent，仅适用于使用非常高的优先级通知，会引起用户的即时关注，如用户已显式设置为一个特定的时间，一个来电或闹钟。

builder.setFullScreenIntent(inCallPendingIntent, true);

设置FullScreenIntent后，会立即响应该Intent ，而不会等待用户去手动触发。参看源码 Phone app 下面的NotificationMgr.java 的updateInCallNotification() 方法的设置