1 /*
2  * Copyright (C) 2023 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.car.carlauncher.calmmode;
18 
19 import android.app.Application;
20 import android.car.Car;
21 import android.car.cluster.ClusterHomeManager;
22 import android.car.cluster.navigation.NavigationState;
23 import android.os.Build;
24 import android.util.Log;
25 
26 import androidx.annotation.NonNull;
27 import androidx.lifecycle.AndroidViewModel;
28 import androidx.lifecycle.LiveData;
29 import androidx.lifecycle.MutableLiveData;
30 
31 import com.google.protobuf.InvalidProtocolBufferException;
32 
33 /**
34  * ViewModel class for showing trip status on Calm mode
35  * This class exposes a {@link androidx.lifecycle.LiveData} for {@link NavigationStateData}
36 */
37 public class NavigationStateViewModel extends AndroidViewModel
38         implements ClusterHomeManager.ClusterNavigationStateListener {
39     private static final boolean DEBUG = Build.isDebuggable();
40     private static final String TAG = NavigationStateViewModel.class.getSimpleName();
41     private final MutableLiveData<NavigationStateData> mNavStateData = new MutableLiveData<>();
42     private ClusterHomeManager mClusterHomeManager;
43     private Car mCar;
44 
NavigationStateViewModel(@onNull Application application)45     public NavigationStateViewModel(@NonNull Application application) {
46         super(application);
47         mCar = Car.createCar(application);
48         if (mCar == null) {
49             if (DEBUG) {
50                 Log.w(TAG, "Car is null, unable to get ClusterHomeManager.");
51             }
52             return;
53         }
54         mClusterHomeManager = (ClusterHomeManager) mCar.getCarManager(Car.CLUSTER_HOME_SERVICE);
55         if (mClusterHomeManager == null) {
56             if (DEBUG) {
57                 Log.w(TAG, "ClusterHomeManager is null,"
58                                 + " unable to registerClusterNavigationStateListener.");
59             }
60             return;
61         }
62         mClusterHomeManager.registerClusterNavigationStateListener(
63                 application.getMainExecutor(), this);
64     }
65 
66 
67     @Override
onNavigationStateChanged(byte[] navigationStateByteArr)68     public void onNavigationStateChanged(byte[] navigationStateByteArr) {
69         if (DEBUG) {
70             Log.v(TAG, "ClusterNavigationStateListener onNavigationState");
71         }
72         NavigationState.NavigationStateProto navigationStateProto;
73         try {
74             navigationStateProto =
75                     NavigationState.NavigationStateProto.parseFrom(navigationStateByteArr);
76         } catch (InvalidProtocolBufferException e) {
77             if (DEBUG) {
78                 Log.e(TAG, "Unable to parse navigation state proto. " + e);
79             }
80             mNavStateData.setValue(null);
81             return;
82         }
83         if (DEBUG) {
84             Log.v(TAG, "onNavigationState: navigationStateProto = " + navigationStateProto);
85         }
86         if (navigationStateProto == null || navigationStateProto.getDestinationsCount() == 0) {
87             mNavStateData.setValue(null);
88             return;
89         }
90 
91         NavigationState.Destination nextDestination = navigationStateProto.getDestinations(0);
92 
93         if (!nextDestination.hasDistance()) {
94             mNavStateData.setValue(null);
95             return;
96         }
97 
98         try {
99             NavigationStateData.Builder navStateDataBuilder =
100                     NavigationStateData.newBuilder()
101                             .setTimeToDestination(
102                                     nextDestination.getFormattedDurationUntilArrival())
103                             .setDistanceToDestination(
104                                     nextDestination.getDistance().getDisplayValue())
105                             .setDistanceUnit(nextDestination.getDistance().getDisplayUnits());
106 
107             mNavStateData.setValue(navStateDataBuilder.build());
108         } catch (Exception e) {
109             if (DEBUG) {
110                 Log.e(TAG, "Unable to create NavigationStateData " + e);
111             }
112             mNavStateData.setValue(null);
113         }
114     }
115 
116     @Override
onCleared()117     protected void onCleared() {
118         super.onCleared();
119         if (DEBUG) {
120             Log.v(TAG, "onCleared()");
121         }
122         if (mCar != null) {
123             mCar.disconnect();
124         }
125         if (mClusterHomeManager != null) {
126             mClusterHomeManager.unregisterClusterNavigationStateListener(this);
127         }
128     }
129 
getNavigationState()130     public LiveData<NavigationStateData> getNavigationState() {
131         return mNavStateData;
132     }
133 }
134