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 the
Intent.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
, or any of the flags as supported byFLAG_UPDATE_CURRENT
to control which unspecified parts of the intent that can be supplied when the actual send happens.Intent.fillIn()
- 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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