推送通知欄 PendingIntent 參數解讀

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

源碼注釋:

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已經存在，保留它并且只替換它的extra數據。

(2) android.app.PendingIntent.FLAG_CANCEL_CURRENT

如果PendingIntent已經存在，那么當前的PendingIntent會取消掉，然后產生一個新的PendingIntent。

(3) android.app.PendingIntent.FLAG_ONE_SHOT

PendingIntent只能使用一次。調用了實例方法send()之后，它會被自動cancel掉，再次調用send()方法將失敗。

(4) android.app.PendingIntent.FLAG_NO_CREATE

如果PendingIntent不存在，簡單了當返回null。

requestCode：

如果一次推送幾個通知到通知欄，且requestCode一致的話，PendingIntent里里邊的數據會被最后一個推送過來的替換掉，即：第一個推送的數據會跟第二個一樣。這點一定要注意。

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