通知栏通知Notification

NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification.Builder nb = new Notification.Builder(this);
nb.setSmallIcon(R.drawable.appicon);
// nb.setTicker(string);//
nb.setWhen(System.currentTimeMillis());
nb.setContentText(string);
nb.setContentTitle("XXXX");

Intent intent = new Intent();//点击跳转
PendingIntent pIntent = PendingIntent.getActivity(this, 0, intent,
PendingIntent.FLAG_CANCEL_CURRENT);
nb.setContentIntent(pIntent);
nb.setPriority(Notification.PRIORITY_HIGH);//设置级别，high和max级别在通知栏刷新时不会闪

if (string.equals("下载成功"))
{
nb.setAutoCancel(true);//点击一下消失
// nm.cancel(0);//撤销通知
}
// nb.setDefaults(Notification.DEFAULT_SOUND);//设置提示声音为系统默认的声音
Notification n = nb.build();
nm.notify(0, n);//通知出来