寫在前面的話####
之前自己在網上查找了幾篇相關文章，在此基礎上打算寫一篇總結性的筆記。寫之前心想先看一下Google的API，結果看了之后發現API已經寫的非常明確了，所以就干脆把API復制過來了。
- PendingIntent可以看作是對Intent的一個封裝，但它不是立刻執行某個行為，而是滿足某些條件或觸發某些事件后才執行指定的行為。
- PendingIntent的獲取
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PendingIntent getActivity (Context context, int requestCode, Intent intent, int flags, Bundle options)
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 the Intent.FLAG_ACTIVITY_NEW_TASK launch flag in the Intent.
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PendingIntent getService (Context context, int requestCode, Intent intent, int flags)
Retrieve a PendingIntent that will start a service, like calling Context.startService()
The start arguments given to the service will come from the extras of the Intent.
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PendingIntent getBroadcast (Context context, int requestCode, Intent intent, int flags)
Retrieve a PendingIntent that will perform a broadcast, like calling Context.sendBroadcast()
For security reasons, the Intent you supply here should almost always be an explicit intent, that is specify an explicit component to be delivered to through Intent.setClass
- PendingIntent的參數說明
拿第三種方式，廣播的形式說明下
PendingIntent sentIntent = PendingIntent.getBroadcast(this, 0,sIntent, 0);
第一個參數是上下文.
第二個參數是每次requestcode不同,就能產生多個Pendingintent.
第三個參數是用來存儲信息.
第四個參數是對不同操作作標識.
getBroadcast(Context context, int requestCode, Intent intent, int flags)中的flags有幾種狀態:
- FLAG_CANCEL_CURRENT:如果AlarmManager管理的PendingIntent已經存在,那么將會取消當前的PendingIntent，從而創建一個新的PendingIntent.
- FLAG_UPDATE_CURRENT:如果AlarmManager管理的PendingIntent已經存在,讓新的Intent更新之前Intent對象數據,例如更新Intent中的Extras,另外,我們也可以在PendingIntent的原進程中調用PendingIntent的cancel ()把其從系統中移除掉
- FLAG_NO_CREATE:如果AlarmManager管理的PendingIntent已經存在,那么將不進行任何操作,直接返回已經.
- FLAG_ONE_SHOT:該PendingIntent只作用一次.在該PendingIntent對象通過send()方法觸發過后,PendingIntent將自動調用cancel()進行銷毀,那么如果你再調用send()方法的話,系統將會返回一個SendIntentException.
