我目前正在调试应用程序中的通知问题。对于某些情况,我想做的是安排在火箭发射时应该弹出的通知。我正在做的是,在从API获取预定启动列表后,我将采用启动日期(自1970年1月1日以来的毫秒数)并从中减去System.currentTimeMillis()
。然后,我将使用生成的时间来安排将来的通知,表示为System.currentTimeMillis() + timeDifference
。我注意到无论出于何种原因,只会显示1个通知。
我通过在将来的2,4和6分钟安排通知来尝试调试,但是通知仅显示在6分钟标记处。
以下是一些相关代码:
public void scheduleNotifications(List<Launch> launches) {
for(int i = 0; i < launches.size(); i++) {
SimpleDateFormat format = new SimpleDateFormat("MMMM dd, yyyy HH:mm:ss z");
Date date = null;
try {
date = format.parse(launches.get(i).getWindowstart());
} catch (ParseException e) {
e.printStackTrace();
}
long timeBetween = date.getTime() - System.currentTimeMillis();
Integer id = Long.valueOf(date.getTime()).intValue();
Intent notificationIntent = new Intent(this, NotificationPublisher.class);
notificationIntent.putExtra(NotificationPublisher.NOTIFICATION_ID, id);
notificationIntent.putExtra(NotificationPublisher.NOTIFICATION, getNotification(launches.get(i).getRocket().getName(), launches.get(i).getLocation().getPads().get(0).getName()));
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, notificationIntent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
//Debug. Schedule at 2, 4, 6 minutes.
if (i == 0) {
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 120000, pendingIntent);
}
if (i == 1) {
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 240000, pendingIntent);
}
if (i == 2) {
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 360000, pendingIntent);
}
}
}
private Notification getNotification(String rocketName, String padName) {
Notification.Builder builder = new Notification.Builder(this);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, MainActivity.class), 0);
builder.setContentIntent(pendingIntent);
builder.setContentTitle("Upcoming Launch");
builder.setContentText("A launch of a " + rocketName + " is about to occur at " + padName + ". Click for more info.");
builder.setSmallIcon(R.drawable.rocket_icon);
return builder.build();
}
广播接收器:
public class NotificationPublisher extends BroadcastReceiver {
public static String NOTIFICATION_ID = "notification_id";
public static String NOTIFICATION = "notification";
public void onReceive(Context context, Intent intent) {
NotificationManager notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = intent.getParcelableExtra(NOTIFICATION);
int id = intent.getIntExtra(NOTIFICATION_ID, 0);
notificationManager.notify(id, notification);
}
}
我想知道为什么只提供一个通知,以及为实现上述目标我需要添加的通知。
答案 0 :(得分:2)
使用AlarmManager
设置闹钟时,它会自动取消任何匹配PendingIntent
的现有闹铃。由于您的所有PendingIntent
包含相同的组件,因此每次设置闹钟时,之前设置的闹钟都会自动取消。
如果要设置多个警报,则必须确保每个PendingIntent
都是唯一的。您可以通过以下方式之一完成此操作:
requestCode
PendingIntent.getBroadcast()
(PendingIntent
的第二个参数)
Intent
PendingIntent.getBroadcast()
的{{1}}中使用其他操作