我需要从后台发送通知,即使用户从RAM中删除了应用程序,从意图中获取信息(以放入通知)作为额外内容。
目前,如果应用程序在后台打开或打开,它可以正常运行,但是当应用程序从最近的应用程序关闭时(从RAM中删除),它无法获得额外的功能。
这是创建后台服务的活动,并将我需要传输的ID作为Extra。
AddEvent.java
// Gets the ID after it was generated by the database
int ID = newEvent.getID();
if (newEvent.hasNotification()) {
// Creates the intent that starts the background service
Intent serviceIntent = new Intent(this, NotificationService.class);
// Puts the ID and the Notification Time as Extras and starts the service
serviceIntent.putExtra(EXTRA_NOTIFICATION_ID,ID);
serviceIntent.putExtra(EXTRA_NOTIFICATION_TIME,notificationDate.getTimeInMillis());
startService(serviceIntent);
}
此活动启动我扩展的IntentService。
NotificationService.java
public class NotificationService extends IntentService {
public NotificationService() {
super("Notification Service");
}
@Override
protected void onHandleIntent(Intent workIntent) {
// Create the intent that is going to push the notification, giving it the previous bundle
Intent notificationIntent = new Intent(this, NotificationPusher.class);
long notificationTime = workIntent.getLongExtra(ActivityAddEvent.EXTRA_NOTIFICATION_TIME,-1);
int ID = workIntent.getIntExtra(ActivityAddEvent.EXTRA_NOTIFICATION_ID,-1);
Log.d("ID Service",""+ID);
notificationIntent.putExtra(ActivityAddEvent.EXTRA_NOTIFICATION_ID,ID);
PendingIntent pusher = PendingIntent.getBroadcast(this, UniqueID.getUniqueID(),
notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
//TODO : Can't get the Extras in Pusher
// Sets the alarm for the designed date and time
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP,notificationTime,pusher);
}
public static class UniqueID {
private final static AtomicInteger uniqueID = new AtomicInteger(0);
public static int getUniqueID() {
return uniqueID.incrementAndGet();
}
}
}
获取通知时间并将其设置为警报管理器,以便在所需时间推送通知。
正确 ID和TIME(只要)然后将ID放入新意图中,即发出通知的通知推送器。
NotificationPusher.java
public class NotificationPusher extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent workIntent) {
// Gets the event from the database using the ID received in the intent
int ID = workIntent.getIntExtra(ActivityAddEvent.EXTRA_NOTIFICATION_ID, -1);
Log.d("ID Pusher", "" + ID);
EventManager eventManager = EventManager.getInstance(context);
Event event = null;
try {
event = eventManager.getEvent(ID);
} catch (SQLException e) {
// TODO: Add error for id not found
e.printStackTrace();
}
if (event != null) {
String notificationTitle;
String notificationText;
// Sets the notification
if (event.hasSubject()) {
notificationTitle = event.getSubject() + "'s " + event.getType().toString();
notificationText = context.getString(R.string.event_notification_default_text);
} else {
notificationTitle = event.getType().toString();
notificationText = event.getTitle();
}
// Create the intent that is gonna be triggered when the notification is clicked and add to the stack
Intent notificationIntent = new Intent(context, ActivitySingleEvent.class);
notificationIntent.putExtra(ActivityAddEvent.EXTRA_NOTIFICATION_ID, ID);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(context, NotificationService.UniqueID.getUniqueID(),
notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
// Gets the default sound for notifications
Uri uri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
// Create the notification with a title,icon,text,sound and vibration
NotificationCompat.Builder nBuilder = new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.ic_alarm_white_24dp)
.setContentTitle(notificationTitle)
.setContentText(notificationText)
.setContentIntent(pendingIntent)
// Notification auto cancel itself when clicked
.setAutoCancel(true)
.setSound(uri)
.setVibrate(new long[]{1000, 1000, 1000, 1000, 1000})
.setLights(Color.BLUE, 3000, 3000);
// Build the notification and issue it
Notification notification = nBuilder.build();
NotificationManager nManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
nManager.notify(ID, notification);
}
else {
Toast.makeText(context,"null event",Toast.LENGTH_SHORT);
}
}
}
在Notification Pusher的顶部,它尝试从Extras获取ID,但每次从ram中删除应用程序时,它都会获得默认值(-1)。 我不知道如何传递此ID。
答案 0 :(得分:0)
您需要将服务作为前台服务,这很可能需要永久性的系统通知,但在应用程序本身关闭时会保持活动状态。
https://developer.android.com/guide/components/services.html#Foreground