1 /*
2  * Copyright (C) 2016 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.dialer.telecom;
18 
19 import android.content.Context;
20 
21 import com.android.car.dialer.livedata.BluetoothHfpStateLiveData;
22 import com.android.car.dialer.livedata.BluetoothPairListLiveData;
23 import com.android.car.dialer.livedata.BluetoothStateLiveData;
24 
25 /**
26  * Class that responsible for getting status of bluetooth connections.
27  */
28 public class UiBluetoothMonitor {
29     private static String TAG = "Em.BtMonitor";
30 
31     private static UiBluetoothMonitor sUiBluetoothMonitor;
32 
33     private final Context mContext;
34 
35     private BluetoothHfpStateLiveData mHfpStateLiveData;
36     private BluetoothPairListLiveData mPairListLiveData;
37     private BluetoothStateLiveData mBluetoothStateLiveData;
38 
39     /**
40      * Initialized a globally accessible {@link UiBluetoothMonitor} which can be retrieved by
41      * {@link #get}. If this function is called a second time before calling {@link #tearDown()},
42      * an exception will be thrown.
43      *
44      * @param applicationContext Application context.
45      */
46     // TODO: Create a singleton abstract class for Dialer common service.
init(Context applicationContext)47     public static UiBluetoothMonitor init(Context applicationContext) {
48         if (sUiBluetoothMonitor == null) {
49             sUiBluetoothMonitor = new UiBluetoothMonitor(applicationContext);
50         } else {
51             throw new IllegalStateException("UiBluetoothMonitor has been initialized.");
52         }
53 
54         return sUiBluetoothMonitor;
55     }
56 
get()57     public static UiBluetoothMonitor get() {
58         return sUiBluetoothMonitor;
59     }
60 
UiBluetoothMonitor(Context applicationContext)61     private UiBluetoothMonitor(Context applicationContext) {
62         mContext = applicationContext;
63     }
64 
65     /**
66      * Stops the {@link UiBluetoothMonitor}. Call this function when Dialer goes to background.
67      * {@link #get()} won't return a valid {@link UiBluetoothMonitor} after calling this function.
68      */
tearDown()69     public void tearDown() {
70         sUiBluetoothMonitor = null;
71     }
72 
73     /**
74      * Returns a LiveData which monitors the HFP profile state changes.
75      */
getHfpStateLiveData()76     public BluetoothHfpStateLiveData getHfpStateLiveData() {
77         if (mHfpStateLiveData == null) {
78             mHfpStateLiveData = new BluetoothHfpStateLiveData(mContext);
79         }
80         return mHfpStateLiveData;
81     }
82 
83     /**
84      * Returns a LiveData which monitors the paired device list changes.
85      */
getPairListLiveData()86     public BluetoothPairListLiveData getPairListLiveData() {
87         if (mPairListLiveData == null) {
88             mPairListLiveData = new BluetoothPairListLiveData(mContext);
89         }
90         return mPairListLiveData;
91     }
92 
93     /**
94      * Returns a LiveData which monitors the Bluetooth state changes.
95      */
getBluetoothStateLiveData()96     public BluetoothStateLiveData getBluetoothStateLiveData() {
97         if (mBluetoothStateLiveData == null) {
98             mBluetoothStateLiveData = new BluetoothStateLiveData(mContext);
99         }
100         return mBluetoothStateLiveData;
101     }
102 }
103