如何在 Android 10 中显示每日离线通知? [英] How to show daily offline notifications in Android 10?
问题描述
我想每天向用户发送离线通知.尝试了很多事情，例如:警报管理器、工作管理器但没有运气.通知没有触发，或者只是稍后触发.
I want to send offline notifications to users daily.Tried many things like: Alarm manager,Work manager but no luck.The notifications are not triggered or they just trigger at later.
有什么办法可以完成工作吗?
Any way to get the job done?
报警功能:
public void StartAlarm()
{
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY,23);
calendar.set(Calendar.MINUTE,59);
calendar.set(Calendar.SECOND,0);
AlarmManager alarmManager = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);
Intent alarmIntent = new Intent(getApplicationContext(), AlarmReceiver.class);
//alarmIntent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
Log.d("LOG", String.valueOf(calendar.getTimeInMillis()));
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 156, alarmIntent, 0);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
alarmManager.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
alarmManager.setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
} else {
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
}
工作经理代码:
public MyWorker(@NonNull Context context, @NonNull WorkerParameters workerParams) {
super(context, workerParams);
}
@NonNull
@Override
public Result doWork() {
StartAlarm();
Log.d("In worker","yes");
return Result.success();
}
工作经理司机:
public void StartPeriodicWorker()
{
final PeriodicWorkRequest periodicWorkRequest = new
PeriodicWorkRequest.Builder(MyWorker.class,24,TimeUnit.HOURS)
.addTag("Birthday")
.build();
WorkManager.getInstance(getApplicationContext()).enqueueUniquePeriodicWork("Birthday Notifier", ExistingPeriodicWorkPolicy.REPLACE, periodicWorkRequest);
}
警报接收器:
public class AlarmReceiver extends BroadcastReceiver {
private DatabaseReference myRef;
private ArrayList<String> allPeoples;
private int numberOfPeoples;
private Context ctx;
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context,"In alarm receiver",Toast.LENGTH_LONG).show();
ctx = context;
initPeoples();
}
public String getCurrentDate() {
Calendar calendar = Calendar.getInstance();
SimpleDateFormat mdformat = new SimpleDateFormat("d MMMM");
String strDate = mdformat.format(calendar.getTime());
return strDate;
}
private void initPeoples() {
FirebaseDatabase database = FirebaseDatabase.getInstance();
myRef = database.getReference("Users");
myRef.keepSynced(true);
myRef.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
allPeoples = new ArrayList<>();
for(DataSnapshot snapshot : dataSnapshot.getChildren()){
if(snapshot.getKey().equals("Teacher") || snapshot.getKey().equals("Staff")){
for(DataSnapshot faculty : snapshot.child("peoples").getChildren()){
String birthday = (String) faculty.child("DOB").getValue();
if(birthday.equals(getCurrentDate())) {
String member = birthday;
allPeoples.add(member);
}
}
}else{
for(DataSnapshot student : snapshot.child("peoples").getChildren()){
String birthday = (String) student.child("DOB").getValue();
if(birthday.equals(getCurrentDate())) {
String member = birthday;
allPeoples.add(member);
}
}
}
}
numberOfPeoples = allPeoples.size();
ShowNotification();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
public void ShowNotification()
{
String CHANNEL_ID = "Channel_1453";
String CHANNEL_NAME = "Birthday Notification";
NotificationManagerCompat manager = NotificationManagerCompat.from(ctx);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME,
NotificationManager.IMPORTANCE_HIGH);
manager.createNotificationChannel(channel);
}
Notification notification = new NotificationCompat.Builder(ctx, CHANNEL_ID)
.setSmallIcon(R.drawable.ic_stat_notify)
.setContentTitle("Birthday Reminder")
.setColor(Color.GREEN)
.setContentText("Click to see who has birthday today!")
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setAutoCancel(true)
.setCategory(NotificationCompat.CATEGORY_MESSAGE)
.setContentIntent(PendingIntent.getActivity(ctx, 0, new Intent(ctx, Birthday.class), PendingIntent.FLAG_UPDATE_CURRENT))
.build();
manager.notify(454, notification);
}
}
推荐答案
我可以看到一个可能的问题，并且可以在没有工作经理的情况下执行此操作(假设设备在通知运行时连接状况良好).
I can see one possible issue, and it's possible to do this without the workmanager (assuming the device has a healthy connection at the time the notification runs).
我建议不要在接收器本身中进行网络连接，而是建议启动一个服务(如果 Android 8.0 以上为前台服务)，然后在那里完成您的工作.这是因为 android 对接收器的时间限制远低于服务/前台服务.所以对我来说，在网络请求完成之前您的接收器被杀死，因此没有显示任何通知，这听起来似乎是合理的.
Instead of doing your network in the receiver itself, I suggest starting a service (foreground service if above Android 8.0), and doing your work there. This is because android's time limit for a receiver is much lower than a service/foreground service. So to me, it sounds plausible that your receiver is killed before the network request completes, and so no notification is shown.
您可以在服务中显示通知，还可以安排下一个警报，因为 setExactAndAllowWhileIdle 本身不是重复警报.所以在你的接收器中，类似:
You can show the notification in the service, and also schedule the next alarm since setExactAndAllowWhileIdle isn't a repetitive alarm on it's own. So in your receiver, something like:
@Override
public void onReceive(Context context, Intent intent) {
Intent service = new Intent(context, BirthdayNotifyService.class);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(service);
} else {
context.startService(service);
}
}
然后是一个可能的服务类:
Then a possible service class:
public class BirthdayNotifyService extends IntentService {
public BirthdayNotifyService() {
super("BirthdayNotifyService");
}
@Override
public int onStartCommand(@Nullable Intent intent, int flags, int startId) {
super.onStartCommand(intent, flags, startId);
return START_STICKY;
}
@Override
protected void onHandleIntent(@Nullable Intent intent) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
//Build a simple notification to show if a foreground service is neccesary
Notification noti = notiBuilder.build();
startForeground(1, noti);
}
//Do your network request work here. After completed, show your birthday notification and stop the foreground service.
}
}
要停止服务，请在显示生日通知后立即使用以下命令:
To stop the service, right AFTER you display your notification for birthdays, use the following:
stopForeground(true);
stopSelf();
更新:我在我的手机(小米红米 Note 8 plus)上使用过这种方法，它运行了几次，但后来停止运行.它在库存 android 上运行良好，但不适用于所有设备.因此，我仍然会说这不是在特定时间发送通知的可靠解决方案.
UPDATE: I used this method on my phone (Xiaomi Redmi Note 8 plus), it worked a few times but then stopped working. It works perfectly fine on stock android, but not on all devices. Therefore I would still say this is not a reliable solution to send notification on specific times.
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