1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.systemui.car.notification;
18 
19 import android.annotation.NonNull;
20 import android.car.Car;
21 import android.car.hardware.power.CarPowerManager;
22 import android.car.hardware.power.CarPowerManager.CarPowerStateListener;
23 import android.util.Log;
24 
25 import com.android.systemui.car.CarServiceProvider;
26 import com.android.systemui.dagger.SysUISingleton;
27 
28 import javax.inject.Inject;
29 
30 /**
31  * Helper class for connecting to the {@link CarPowerManager} and listening for power state changes.
32  */
33 @SysUISingleton
34 public class PowerManagerHelper {
35     public static final String TAG = "PowerManagerHelper";
36 
37     private final CarServiceProvider mCarServiceProvider;
38 
39     private CarPowerManager mCarPowerManager;
40     private CarPowerStateListener mCarPowerStateListener;
41 
42     private final CarServiceProvider.CarServiceOnConnectedListener mCarServiceLifecycleListener;
43 
44     @Inject
PowerManagerHelper(CarServiceProvider carServiceProvider)45     public PowerManagerHelper(CarServiceProvider carServiceProvider) {
46         mCarServiceProvider = carServiceProvider;
47         mCarServiceLifecycleListener = car -> {
48             Log.d(TAG, "Car Service connected");
49             mCarPowerManager = (CarPowerManager) car.getCarManager(Car.POWER_SERVICE);
50             if (mCarPowerManager != null) {
51                 mCarPowerManager.setListener(mCarPowerStateListener);
52             } else {
53                 Log.e(TAG, "CarPowerManager service not available");
54             }
55         };
56     }
57 
58     /**
59      * Sets a {@link CarPowerStateListener}. Should be set before {@link #connectToCarService()}.
60      */
setCarPowerStateListener(@onNull CarPowerStateListener listener)61     public void setCarPowerStateListener(@NonNull CarPowerStateListener listener) {
62         mCarPowerStateListener = listener;
63     }
64 
65     /**
66      * Connect to Car service.
67      */
connectToCarService()68     public void connectToCarService() {
69         mCarServiceProvider.addListener(mCarServiceLifecycleListener);
70     }
71 }
72