PendingIntent android.app.PendingIntent.getActivity(Context context,int requestCode,Intent intent,int flags)

源码注释:

Retrieve a PendingIntent that will start a new activity, like calling Context.startActivity(Intent). Note that the activity will be started outside of the context of an existing activity, so you must use theIntent.FLAG_ACTIVITY_NEW_TASK launch flag in the Intent.

• Parameters:

• context The Context in which this PendingIntent should start the activity.

• requestCode Private request code for the sender (currently not used).

• intent Intent of the activity to be launched.

• flags May be FLAG_ONE_SHOT, FLAG_NO_CREATE, FLAG_CANCEL_CURRENT, FLAG_UPDATE_CURRENT, or any of the flags as supported by Intent.fillIn() to control which unspecified parts of the intent that can be supplied when the actual send happens.

• Returns:

• Returns an existing or new PendingIntent matching the given parameters. May return null only ifFLAG_NO_CREATE has been supplied.

  flags:
  

(1) android.app.PendingIntent.FLAG_UPDATE_CURRENT

如果PendingIntent已经存在，保留它并且只替换它的extra数据。

(2) android.app.PendingIntent.FLAG_CANCEL_CURRENT

如果PendingIntent已经存在，那么当前的PendingIntent会取消掉，然后产生一个新的PendingIntent。

(3) android.app.PendingIntent.FLAG_ONE_SHOT

PendingIntent只能使用一次。调用了实例方法send()之后，它会被自动cancel掉，再次调用send()方法将失败。

(4) android.app.PendingIntent.FLAG_NO_CREATE

如果PendingIntent不存在，简单了当返回null。

requestCode：

如果一次推送几个通知到通知栏，且requestCode一致的话，PendingIntent里里边的数据会被最后一个推送过来的替换掉，即：第一个推送的数据会跟第二个一样。这点一定要注意。

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推送通知栏 PendingIntent 参数解读