| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.systemui.settings; |
| |
| import androidx.lifecycle.LiveData; |
| import androidx.lifecycle.MutableLiveData; |
| |
| import com.android.systemui.broadcast.BroadcastDispatcher; |
| |
| /** |
| * A class that has an observable for the current user. |
| */ |
| public class CurrentUserObservable { |
| |
| private final CurrentUserTracker mTracker; |
| |
| private final MutableLiveData<Integer> mCurrentUser = new MutableLiveData<Integer>() { |
| @Override |
| protected void onActive() { |
| super.onActive(); |
| mTracker.startTracking(); |
| } |
| |
| @Override |
| protected void onInactive() { |
| super.onInactive(); |
| mTracker.startTracking(); |
| } |
| }; |
| |
| public CurrentUserObservable(BroadcastDispatcher broadcastDispatcher) { |
| mTracker = new CurrentUserTracker(broadcastDispatcher) { |
| @Override |
| public void onUserSwitched(int newUserId) { |
| mCurrentUser.setValue(newUserId); |
| } |
| }; |
| } |
| |
| /** |
| * Returns the current user that can be observed. |
| */ |
| public LiveData<Integer> getCurrentUser() { |
| if (mCurrentUser.getValue() == null) { |
| mCurrentUser.setValue(mTracker.getCurrentUserId()); |
| } |
| return mCurrentUser; |
| } |
| } |