PendingIntent android.app.PendingIntent.getActivity(Context context,int requestCode,Intent intent,int flags)
源碼註釋:
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 byIntent.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 if
FLAG_NO_CREATE
has been supplied.flags:
(1) android.app.PendingIntent.FLAG_UPDATE_CURRENT
如果PendingIntent已經存在,保留它並且只替換它的extra數據。
(2) android.app.PendingIntent.FLAG_CANCEL_CURRENT
如果PendingIntent已經存在,那麼當前的PendingIntent會取消掉,然後產生一個新的PendingIntent。
(3) android.app.PendingIntent.FLAG_ONE_SHOT
PendingIntent只能使用一次。調用了實例方法send()之後,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裏裏邊的數據會被最後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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