我有一个 IntentService,在这个即时服务中onCreate
,我调用了方法startforeground()
。然后我会在创建 intentService 时看到通知。但是,当 IntentService 被销毁(转到 onDestroy)时,我可以在服务被销毁后的几秒钟内看到通知。这是为什么?
这是 IntentService 的代码:
public class USFIntentService extends IntentService {
private static final String TAG = "USFIntentService";
private static final int USF_NOTIFICATION_ID = 262276;
private static final String USF_NOTIFICATION_CHANNEL_ID = "USF_NOTIFICATION_CHANNEL";
public USFIntentService() {
super("USFIntentService");
}
@Override
public void onCreate() {
super.onCreate();
Log.i(TAG,"in onCreate");
startUsfForegroundService();
}
@Override
public void onDestroy() {
super.onDestroy();
Log.i(TAG,"in onDestroy");
}
private void startUsfForegroundService() {
// Define notification channel
CharSequence name = getString(R.string.channel_name);
String description = getString(R.string.channel_description);
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel =
new NotificationChannel(USF_NOTIFICATION_CHANNEL_ID, name, importance);
channel.setDescription(description);
NotificationManager notificationManager = getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
// Build notification to be used for the foreground service.
Notification notification =
new Notification.Builder(this, USF_NOTIFICATION_CHANNEL_ID)
.setContentTitle(getText(R.string.notification_title))
.setContentText(getText(R.string.notification_message))
.setSmallIcon(R.drawable.usf_notification_icon)
.build();
// Set the service as a foreground service.
startForeground(USF_NOTIFICATION_ID, notification);
}
@Override
protected void onHandleIntent(Intent intent) {
Log.i(TAG, "onHandleIntent");
if (intent != null) {
doStuff();
}
Log.i(TAG,"End of onHandleIntent");
}
}
我这样称呼这个服务:
Intent startServiceIntent = new Intent(intent);
startServiceIntent.setComponent(new ComponentName(context, USFIntentService.class));
context.startForegroundService(startServiceIntent);