android-firebase childEventListener在服务中

Question

<service android:name=".ChildEventListener"/>

public class ChildEventListener extends Service {

FirebaseAuth auth;
NotificationCompat.Builder builder;

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public int onStartCommand(Intent intent,  int flags, int startId) {
    retrivemsg();
    return START_STICKY;
}

public void retrivemsg()
{
    DatabaseReference mdb= FirebaseDatabase.getInstance().getReference("messages/"+auth.getCurrentUser().getUid());
    builder=new NotificationCompat.Builder(this,"onchildadded");
    mdb.addChildEventListener(new com.google.firebase.database.ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {

            String msg=dataSnapshot.child("msg").getKey();
            builder.setSmallIcon(R.drawable.send);
            builder.setContentTitle("child added");
            builder.setContentText(msg);
            NotificationManager notificationManager=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
            notificationManager.notify(1,builder.build());
        }

        @Override
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onChildRemoved(DataSnapshot dataSnapshot) {

        }

        @Override
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

Answer 1

实际上，我们可以在舱单FIE开始一项服务。但是在我的例子中，我的错误是我没有在我真正想要启动的地方添加start service语句。所以只要加上

startService(new Intent(this, ChildEventListener.class));

我有一门课，我想开始它。解决了我的问题。

-Thanx@merterpam，谢谢你指出我的错误