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.os.Handler;
24 import android.os.HandlerExecutor;
25 import android.os.Looper;
26 import android.util.Log;
27 
28 import com.android.systemui.car.CarServiceProvider;
29 import com.android.systemui.dagger.SysUISingleton;
30 
31 import java.util.concurrent.Executor;
32 
33 import javax.inject.Inject;
34 
35 /**
36  * Helper class for connecting to the {@link CarPowerManager} and listening for power state changes.
37  */
38 @SysUISingleton
39 public class PowerManagerHelper {
40     public static final String TAG = "PowerManagerHelper";
41 
42     private final CarServiceProvider mCarServiceProvider;
43 
44     private CarPowerManager mCarPowerManager;
45     private CarPowerStateListener mCarPowerStateListener;
46 
47     private final CarServiceProvider.CarServiceOnConnectedListener mCarServiceLifecycleListener;
48 
49     @Inject
PowerManagerHelper(CarServiceProvider carServiceProvider)50     public PowerManagerHelper(CarServiceProvider carServiceProvider) {
51         mCarServiceProvider = carServiceProvider;
52         mCarServiceLifecycleListener = car -> {
53             Log.d(TAG, "Car Service connected");
54             mCarPowerManager = (CarPowerManager) car.getCarManager(Car.POWER_SERVICE);
55             if (mCarPowerManager != null) {
56                 mCarPowerManager.setListener(getMainExecutor(), mCarPowerStateListener);
57             } else {
58                 Log.e(TAG, "CarPowerManager service not available");
59             }
60         };
61     }
62 
63     /**
64      * Sets a {@link CarPowerStateListener}. Should be set before {@link #connectToCarService()}.
65      */
setCarPowerStateListener(@onNull CarPowerStateListener listener)66     public void setCarPowerStateListener(@NonNull CarPowerStateListener listener) {
67         mCarPowerStateListener = listener;
68     }
69 
70     /**
71      * Connect to Car service.
72      */
connectToCarService()73     public void connectToCarService() {
74         mCarServiceProvider.addListener(mCarServiceLifecycleListener);
75     }
76 
getMainExecutor()77     private static Executor getMainExecutor() {
78         return new HandlerExecutor(new Handler(Looper.getMainLooper()));
79     }
80 }
81