1 /*
2  * Copyright (C) 2014 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.server.telecom;
18 
19 import android.content.Context;
20 import android.media.AudioDeviceCallback;
21 import android.media.AudioDeviceInfo;
22 import android.media.AudioManager;
23 import android.telecom.Log;
24 
25 import com.android.internal.annotations.VisibleForTesting;
26 import com.android.internal.util.IndentingPrintWriter;
27 
28 import java.util.Collections;
29 import java.util.Set;
30 import java.util.concurrent.ConcurrentHashMap;
31 
32 /** Listens for and caches headset state. */
33 @VisibleForTesting
34 public class WiredHeadsetManager {
35     @VisibleForTesting
36     public interface Listener {
onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn)37         void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn);
38     }
39 
40     /** Receiver for wired headset plugged and unplugged events. */
41     private class WiredHeadsetCallback extends AudioDeviceCallback {
42         @Override
onAudioDevicesAdded(AudioDeviceInfo[] addedDevices)43         public void onAudioDevicesAdded(AudioDeviceInfo[] addedDevices) {
44             Log.startSession("WHC.oADA");
45             try {
46                 updateHeadsetStatus();
47             } finally {
48                 Log.endSession();
49             }
50         }
51 
52         @Override
onAudioDevicesRemoved(AudioDeviceInfo[] devices)53         public void onAudioDevicesRemoved(AudioDeviceInfo[] devices) {
54             Log.startSession("WHC.oADR");
55             try {
56                 updateHeadsetStatus();
57             } finally {
58                 Log.endSession();
59             }
60         }
61 
updateHeadsetStatus()62         private void updateHeadsetStatus() {
63             AudioDeviceInfo[] devices = mAudioManager.getDevices(AudioManager.GET_DEVICES_ALL);
64             boolean isPluggedIn = false;
65             for (AudioDeviceInfo device : devices) {
66                 switch (device.getType()) {
67                     case AudioDeviceInfo.TYPE_WIRED_HEADPHONES:
68                     case AudioDeviceInfo.TYPE_WIRED_HEADSET:
69                     case AudioDeviceInfo.TYPE_USB_DEVICE:
70                         isPluggedIn = true;
71                 }
72             }
73 
74             Log.i(WiredHeadsetManager.this, "ACTION_HEADSET_PLUG event, plugged in: %b, ",
75                     isPluggedIn);
76             onHeadsetPluggedInChanged(isPluggedIn);
77         }
78     }
79 
80     private final AudioManager mAudioManager;
81     private boolean mIsPluggedIn;
82     /**
83      * ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is
84      * load factor before resizing, 1 means we only expect a single thread to
85      * access the map so make only a single shard
86      */
87     private final Set<Listener> mListeners = Collections.newSetFromMap(
88             new ConcurrentHashMap<>(8, 0.9f, 1));
89 
WiredHeadsetManager(Context context)90     public WiredHeadsetManager(Context context) {
91         mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
92         mIsPluggedIn = mAudioManager.isWiredHeadsetOn();
93 
94         mAudioManager.registerAudioDeviceCallback(new WiredHeadsetCallback(), null);
95     }
96 
97     @VisibleForTesting
addListener(Listener listener)98     public void addListener(Listener listener) {
99         mListeners.add(listener);
100     }
101 
removeListener(Listener listener)102     void removeListener(Listener listener) {
103         if (listener != null) {
104             mListeners.remove(listener);
105         }
106     }
107 
108     @VisibleForTesting
isPluggedIn()109     public boolean isPluggedIn() {
110         return mIsPluggedIn;
111     }
112 
onHeadsetPluggedInChanged(boolean isPluggedIn)113     private void onHeadsetPluggedInChanged(boolean isPluggedIn) {
114         if (mIsPluggedIn != isPluggedIn) {
115             Log.v(this, "onHeadsetPluggedInChanged, mIsPluggedIn: %b -> %b", mIsPluggedIn,
116                     isPluggedIn);
117             boolean oldIsPluggedIn = mIsPluggedIn;
118             mIsPluggedIn = isPluggedIn;
119             for (Listener listener : mListeners) {
120                 listener.onWiredHeadsetPluggedInChanged(oldIsPluggedIn, mIsPluggedIn);
121             }
122         }
123     }
124 
125     /**
126      * Dumps the state of the {@link WiredHeadsetManager}.
127      *
128      * @param pw The {@code IndentingPrintWriter} to write the state to.
129      */
dump(IndentingPrintWriter pw)130     public void dump(IndentingPrintWriter pw) {
131         pw.println("mIsPluggedIn: " + mIsPluggedIn);
132     }
133 }
134