WiredHeadsetManager.java revision ca9988ba4e8aed7d04835eca57b62f397c1a08f4 
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
17package com.android.server.telecom;
18
19import android.content.Context;
20import android.media.AudioDeviceCallback;
21import android.media.AudioDeviceInfo;
22import android.media.AudioManager;
23
24import com.android.internal.annotations.VisibleForTesting;
25import com.android.internal.util.IndentingPrintWriter;
26
27import java.util.Collections;
28import java.util.Set;
29import java.util.concurrent.ConcurrentHashMap;
30
31/** Listens for and caches headset state. */
32@VisibleForTesting
33public class WiredHeadsetManager {
34    private static final int VALID_WIRED_DEVICES = AudioManager.DEVICE_OUT_WIRED_HEADSET |
35            AudioManager.DEVICE_OUT_WIRED_HEADPHONE |
36            AudioManager.DEVICE_OUT_USB_DEVICE;
37
38    @VisibleForTesting
39    public interface Listener {
40        void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn);
41    }
42
43    /** Receiver for wired headset plugged and unplugged events. */
44    private class WiredHeadsetCallback extends AudioDeviceCallback {
45        @Override
46        public void onAudioDevicesAdded(AudioDeviceInfo[] addedDevices) {
47            Log.startSession("WHC.oADA");
48            try {
49                updateHeadsetStatus();
50            } finally {
51                Log.endSession();
52            }
53        }
54
55        @Override
56        public void onAudioDevicesRemoved(AudioDeviceInfo[] devices) {
57            Log.startSession("WHC.oADR");
58            try {
59                updateHeadsetStatus();
60            } finally {
61                Log.endSession();
62            }
63        }
64
65        private void updateHeadsetStatus() {
66            int devices = mAudioManager.getDevicesForStream(AudioManager.STREAM_VOICE_CALL);
67
68            boolean isPluggedIn = (devices & VALID_WIRED_DEVICES) != 0;
69            Log.i(WiredHeadsetManager.this, "ACTION_HEADSET_PLUG event, plugged in: %b, " +
70                    "devices: %s", isPluggedIn, Integer.toHexString(devices));
71            onHeadsetPluggedInChanged(isPluggedIn);
72        }
73    }
74
75    private final AudioManager mAudioManager;
76    private boolean mIsPluggedIn;
77    /**
78     * ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is
79     * load factor before resizing, 1 means we only expect a single thread to
80     * access the map so make only a single shard
81     */
82    private final Set<Listener> mListeners = Collections.newSetFromMap(
83            new ConcurrentHashMap<>(8, 0.9f, 1));
84
85    public WiredHeadsetManager(Context context) {
86        mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
87        mIsPluggedIn = mAudioManager.isWiredHeadsetOn();
88
89        mAudioManager.registerAudioDeviceCallback(new WiredHeadsetCallback(), null);
90    }
91
92    @VisibleForTesting
93    public void addListener(Listener listener) {
94        mListeners.add(listener);
95    }
96
97    void removeListener(Listener listener) {
98        if (listener != null) {
99            mListeners.remove(listener);
100        }
101    }
102
103    @VisibleForTesting
104    public boolean isPluggedIn() {
105        return mIsPluggedIn;
106    }
107
108    private void onHeadsetPluggedInChanged(boolean isPluggedIn) {
109        if (mIsPluggedIn != isPluggedIn) {
110            Log.v(this, "onHeadsetPluggedInChanged, mIsPluggedIn: %b -> %b", mIsPluggedIn,
111                    isPluggedIn);
112            boolean oldIsPluggedIn = mIsPluggedIn;
113            mIsPluggedIn = isPluggedIn;
114            for (Listener listener : mListeners) {
115                listener.onWiredHeadsetPluggedInChanged(oldIsPluggedIn, mIsPluggedIn);
116            }
117        }
118    }
119
120    /**
121     * Dumps the state of the {@link WiredHeadsetManager}.
122     *
123     * @param pw The {@code IndentingPrintWriter} to write the state to.
124     */
125    public void dump(IndentingPrintWriter pw) {
126        pw.println("mIsPluggedIn: " + mIsPluggedIn);
127    }
128}
129