本文主要是介绍andoid中pendingIntent和Intent的区别,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
Intent 是及时启动,intent 随所在的activity 消失而消失。
PendingIntent 可以看作是对intent的包装,通常通过getActivity,getBroadcast ,getService来得到pendingintent的实例,当前activity并不能马上启动它所包含的intent,而是在外部执行 pendingintent时,调用intent的。正由于pendingintent中 保存有当前App的Context,使它赋予外部App一种能力,使得外部App可以如同当前App一样的执行pendingintent里的 Intent, 就算在执行时当前App已经不存在了,也能通过存在pendingintent里的Context照样执行Intent。另外还可以处理intent执行后的操作。常和alermanger 和notificationmanager一起使用。
Intent一般是用作Activity、Sercvice、BroadcastReceiver之间传递数据,而Pendingintent,一般用在 Notification上,可以理解为延迟执行的intent,PendingIntent是对Intent一个包装。
1 private void showNotify(){
2 Notification notice=new Notification();
3 notice.icon=R.drawable.icon;
4 notice.tickerText="您有一条新的信息";
5 notice.defaults=Notification.DEFAULT_SOUND;
6 notice.when=10L;
7 // 100 毫秒延迟后,震动 250 毫秒,暂停 100 毫秒后,再震动 500 毫秒
8 //notice.vibrate = new long[] { 100, 250, 100, 500 };出错?
9 //notice.setLatestEventInfo(this, "通知", "开会啦", PendingIntent.getActivity(this, 0, null, 0));
10 notice.setLatestEventInfo(this, "通知", "开会啦", PendingIntent.getActivity(this, 0, new Intent(this,Activity2.class), 0));//即将跳转页面,还没跳转
11 NotificationManager manager=(NotificationManager)getSystemService(this.NOTIFICATION_SERVICE);
12 manager.notify(0,notice);
13 }
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14 private void showNotify(){
15 Notification notice=new Notification();
16 notice.icon=R.drawable.icon;
17 notice.tickerText="您有一条新的信息";
18 notice.defaults=Notification.DEFAULT_SOUND;
19 notice.when=10L;
20 // 100 毫秒延迟后,震动 250 毫秒,暂停 100 毫秒后,再震动 500 毫秒
21 //notice.vibrate = new long[] { 100, 250, 100, 500 };出错?
22 //notice.setLatestEventInfo(this, "通知", "开会啦", PendingIntent.getActivity(this, 0, null, 0));
23 notice.setLatestEventInfo(this, "通知", "开会啦", PendingIntent.getActivity(this, 0, new Intent(this,Activity2.class), 0));//即将跳转页面,还没跳转
24 NotificationManager manager=(NotificationManager)getSystemService(this.NOTIFICATION_SERVICE);
25 manager.notify(0,notice);
26 }
private void showNotify(){
Notification notice=new Notification();
notice.icon=R.drawable.icon;
notice.tickerText="您有一条新的信息";
notice.defaults=Notification.DEFAULT_SOUND;
notice.when=10L;
// 100 毫秒延迟后,震动 250 毫秒,暂停 100 毫秒后,再震动 500 毫秒
//notice.vibrate = new long[] { 100, 250, 100, 500 };出错?
//notice.setLatestEventInfo(this, "通知", "开会啦", PendingIntent.getActivity(this, 0, null, 0));
notice.setLatestEventInfo(this, "通知", "开会啦", PendingIntent.getActivity(this, 0, new Intent(this,Activity2.class), 0));//即将跳转页面,还没跳转
NotificationManager manager=(NotificationManager)getSystemService(this.NOTIFICATION_SERVICE);
manager.notify(0,notice);
}
1. GSM网络中android发送短信示例
27 String msg ="你好,美女";
28 String number = "135****6784";
29 SmsManager sms = SmsManager.getDefault();
30
31 PendingIntent pi = PendingIntent.getBroadcast(SmsActivity.this,0,new Intent(...),0);
32 sms.sendTextMessage(number, null, msg, pi, null);
33 Toast.makeText(SmsActivity.this,"发送成功",Toast.LENGHT_LONG).show();
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34 String msg ="你好,美女";
35 String number = "135****6784";
36 SmsManager sms = SmsManager.getDefault();
37
38 PendingIntent pi = PendingIntent.getBroadcast(SmsActivity.this,0,new Intent(...),0);
39 sms.sendTextMessage(number, null, msg, pi, null);
40 Toast.makeText(SmsActivity.this,"发送成功",Toast.LENGHT_LONG).show();
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();
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。
PendingIntent就是一个可以在满足一定条件下执行的Intent,它相比于Intent的优势在于自己携带有Context对象,这样他就不必依赖于某个activity才可以存在。
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