这是我到目前为止编写的代码，但是在销毁活动时它无法运行。我想听我的Firebase中的任何更改并将其保存在数组中，当活动处于onPause或onStop销毁时它可以工作，它确实在日志中显示任何更新
public class FirebaseSectionWorker extends Worker {
final String TAG = "FirebaseBackground";
private DatabaseReference mDatabase;
public FirebaseSectionWorker(@NonNull Context context, @NonNull WorkerParameters workerParams) {
super(context, workerParams);
}
@Override
public void onStopped() {
super.onStopped();
Log.d(TAG, "onStopped: Firebase listener stopped");
}
@NonNull
@Override
public Result doWork() {
Log.d(TAG, "doWork(): Has started to run in the background");
//Database reference
mDatabase = FirebaseDatabase.getInstance().getReference().child("users");
mDatabase.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
Log.d(TAG, "onChildChanged(): A child has been changed: " + dataSnapshot);
}
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
return Result.success();
}
}
WorkManager isn't for work that must stay active in the background indefinitely, so it won't work for things like Firebase listeners. The best you can do is set up a foreground service, but even that can get killed in some situations.
如果您有新数据要发送到客户端应用程序，则应考虑改为使用Firebase Cloud Messaging发送数据，Firebase Cloud Messaging将唤醒您的应用程序以传递消息。