PendingIntent详解

首先看下pendingIntent和intent的区别

1、pendingIntent是将要发生的action。intent是立即发生的action

2、pendingIntent可以取消。Intent不能取消

3、intent必须在context内执行，所以当程序执行完，intent也终止。

pendingIntent自带context，没有限制。

4、intent在原来的task中运行，pendingIntent在不同的task中运行

pendingIntent主要用于 通知栏(NotificationManager)和发送短信（SmsManager）的监控

下边俩个例子

//获取通知管理器
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
int icon = R.drawable.logo;
long when = System.currentTimeMillis();//通知发生的时间为系统当前时间
//新建一个通知，指定其图标和标题
Notification notification = new Notification(icon, null, when);//第一个参数为图标,第二个参数为短暂提示标题,第三个为通知时间
notification.defaults = Notification.DEFAULT_SOUND;//发出默认声音
notification.flags |= Notification.FLAG_AUTO_CANCEL;//点击通知后自动清除通知
Intent openintent = new Intent(this, TouchTest.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, openintent, 0);//当点击消息时就会向系统发送openintent意图
notification.setLatestEventInfo(this, "标题", "我是内容", contentIntent);
mNotificationManager.notify(0, notification);//第一个参数为自定义的通知唯一标识

private final static String SEND_ACTION = "send";
private final static String DELIVERED_ACTION = "delivered";


private void sendSms(String receiver, String text) {
SmsManager s = SmsManager.getDefault();
PendingIntent sentPI = PendingIntent.getBroadcast(this, 0, new Intent(
SEND_ACTION), PendingIntent.FLAG_CANCEL_CURRENT);
final PendingIntent deliveredPI = PendingIntent
.getBroadcast(this, 0, new Intent(DELIVERED_ACTION),
PendingIntent.FLAG_CANCEL_CURRENT);
// 发送完成
registerReceiver(new BroadcastReceiver() {


@Override
public void onReceive(Context context, Intent intent) {
switch (getResultCode()) {
case Activity.RESULT_OK:
Toast.makeText(getBaseContext(), "Send Success!",
Toast.LENGTH_SHORT).show();
break;
case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
Toast.makeText(getBaseContext(),
"Send Failed because generic failure cause.",
Toast.LENGTH_SHORT).show();
break;
case SmsManager.RESULT_ERROR_NO_SERVICE:
Toast.makeText(
getBaseContext(),
"Send Failed because service is currently unavailable.",
Toast.LENGTH_SHORT).show();
break;
case SmsManager.RESULT_ERROR_NULL_PDU:
Toast.makeText(getBaseContext(),
"Send Failed because no pdu provided.",
Toast.LENGTH_SHORT).show();
break;
case SmsManager.RESULT_ERROR_RADIO_OFF:
Toast.makeText(
getBaseContext(),
"Send Failed because radio was explicitly turned off.",
Toast.LENGTH_SHORT).show();
break;
default:
Toast.makeText(getBaseContext(), "Send Failed.",
Toast.LENGTH_SHORT).show();
break;
}
}
}, new IntentFilter(SEND_ACTION));


// 对方接受完成
registerReceiver(new BroadcastReceiver() {


@Override
public void onReceive(Context context, Intent intent) {
switch (getResultCode()) {
case Activity.RESULT_OK:
Toast.makeText(getBaseContext(), "Delivered Success!",
Toast.LENGTH_SHORT).show();
break;
default:
Toast.makeText(getBaseContext(), "Delivered Failed!",
Toast.LENGTH_SHORT).show();
break;
}
}
}, new IntentFilter(DELIVERED_ACTION));


// 发送短信，sentPI和deliveredPI将分别在短信发送成功和对方接受成功时被广播
s.sendTextMessage(receiver, null, text, sentPI, deliveredPI);
}

另外总结下获取pendingIntent对象的方法

你可以通过getActivity(Context context, int requestCode, Intent intent, int flags)系列方法从系统取得一个用于启动一个Activity的PendingIntent对象,

       可以通过getService(Context context, int requestCode, Intent intent, int flags)方法从系统取得一个用于启动一个Service的PendingIntent对象

        可以通过getBroadcast(Context context, int requestCode, Intent intent, int flags)方法从系统取得一个用于向BroadcastReceiver的Intent广播的PendingIntent对象