1 /* 2 * Copyright (C) 2018 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; 18 19 import android.app.Application; 20 import android.car.Car; 21 import android.car.CarNotConnectedException; 22 import android.car.CarProjectionManager; 23 import android.car.CarProjectionManager.ProjectionStatusListener; 24 import android.content.Context; 25 import android.content.Intent; 26 import android.graphics.drawable.Drawable; 27 import android.os.UserManager; 28 29 import androidx.annotation.Nullable; 30 import androidx.annotation.VisibleForTesting; 31 import androidx.lifecycle.AndroidViewModel; 32 import androidx.lifecycle.LiveData; 33 import androidx.lifecycle.MediatorLiveData; 34 import androidx.lifecycle.MutableLiveData; 35 import androidx.lifecycle.Observer; 36 import androidx.lifecycle.Transformations; 37 import androidx.lifecycle.ViewModel; 38 39 import java.util.Arrays; 40 import java.util.Collections; 41 import java.util.List; 42 import java.util.Objects; 43 44 /** 45 * Implementation {@link ViewModel} for {@link ContextualFragment}. 46 * 47 * Returns the first non-null {@link ContextualInfo} from a set of delegates. 48 */ 49 public class ContextualViewModel extends AndroidViewModel { 50 private final MediatorLiveData<ContextualInfo> mContextualInfo = new MediatorLiveData<>(); 51 52 private final List<LiveData<ContextualInfo>> mInfoDelegates; 53 54 private Car mCar; 55 ContextualViewModel(Application application)56 public ContextualViewModel(Application application) { 57 this(application, null); 58 } 59 60 @VisibleForTesting ContextualViewModel(Application application, CarProjectionManager carProjectionManager)61 ContextualViewModel(Application application, CarProjectionManager carProjectionManager) { 62 super(application); 63 64 if (carProjectionManager == null) { 65 mCar = Car.createCar(application); 66 carProjectionManager = 67 (CarProjectionManager) mCar.getCarManager(Car.PROJECTION_SERVICE); 68 } 69 70 mInfoDelegates = 71 Collections.unmodifiableList(Arrays.asList( 72 new ProjectionContextualInfoLiveData(application, carProjectionManager), 73 new WeatherContextualInfoLiveData(application) 74 )); 75 76 Observer<Object> observer = x -> updateLiveData(); 77 for (LiveData<ContextualInfo> delegate : mInfoDelegates) { 78 mContextualInfo.addSource(delegate, observer); 79 } 80 } 81 82 @Override onCleared()83 protected void onCleared() { 84 if (mCar != null && mCar.isConnected()) { 85 mCar.disconnect(); 86 mCar = null; 87 } 88 super.onCleared(); 89 } 90 updateLiveData()91 private void updateLiveData() { 92 for (LiveData<ContextualInfo> delegate : mInfoDelegates) { 93 ContextualInfo value = delegate.getValue(); 94 if (value != null) { 95 mContextualInfo.setValue(value); 96 return; 97 } 98 } 99 100 mContextualInfo.setValue(null); 101 } 102 getContextualInfo()103 public LiveData<ContextualInfo> getContextualInfo() { 104 return mContextualInfo; 105 } 106 } 107