【转】PendingIntent和Intent的区别

Notification n = new Notification(R.drawable.face_1, "Service启动", System.currentTimeMillis());  
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, TServiceHolder.class), 0);  
n.setLatestEventInfo(this, "任务标题", "任务内容", contentIntent);  
nManager.notify(NOTIFICATION_ID, n); // 任务栏启动 

PendingIntent和Intent的区别：An Intent is something that is used right now; a PendingIntent is something that may create an Intent in the future. You will use a PendingIntent with Notifications, AlarmManager, etc.
1. GSM网络中android发送短信示例
（1）代码节选

String msg ="你好，美女";  
String number = "135****6784";  
SmsManager sms = SmsManager.getDefault();  
  
PendingIntent pi = PendingIntent.getBroadcast(SmsActivity.this,0,new Intent(...),0);  
sms.sendTextMessage(number, null, msg, pi, null);  
Toast.makeText(SmsActivity.this,"发送成功",Toast.LENGHT_LONG).show();  

2）代码解释
      PendingIntent就是一个Intent的描述，我们可以把这个描述交给别的程序，别的程序根据这个描述在后面的别的时间做你安排做的事情 （By giving a PendingIntent to another application, you are granting it the right to perform the operation you have specified as if the other application was yourself，就相当于PendingIntent代表了Intent）。本例中别的程序就是发送短信的程序，短信发送成功后要把intent广播出去 。
      函数SmsManager.sendTextMessage(String destinationAddress, String scAddress, String text, PendingIntent sentIntent, PendingIntent deliveryIntent)中参数解释：
      1）PendingIntent sentIntent：当短信发出时，成功的话sendIntent会把其内部的描述的intent广播出去，否则产生错误代码并通过android.app.PendingIntent.OnFinished进行回调，这个参数最好不为空，否则会存在资源浪费的潜在问题；
      2）PendingIntent deliveryIntent：是当消息已经传递给收信人后所进行的PendingIntent广播。
      查看PendingIntent 类可以看到许多的Send函数，就是PendingIntent在进行被赋予的相关的操作。

原文地址 http://wayfarer.iteye.com/blog/586159