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.BroadcastReceiver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.IntentFilter;
23import android.media.AudioManager;
24
25import java.util.Collections;
26import java.util.Set;
27import java.util.concurrent.ConcurrentHashMap;
28
29/** Listens for and caches headset state. */
30class WiredHeadsetManager {
31    interface Listener {
32        void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn);
33    }
34
35    /** Receiver for wired headset plugged and unplugged events. */
36    private class WiredHeadsetBroadcastReceiver extends BroadcastReceiver {
37        @Override
38        public void onReceive(Context context, Intent intent) {
39            if (intent.getAction().equals(Intent.ACTION_HEADSET_PLUG)) {
40                boolean isPluggedIn = intent.getIntExtra("state", 0) == 1;
41                Log.v(WiredHeadsetManager.this, "ACTION_HEADSET_PLUG event, plugged in: %b",
42                        isPluggedIn);
43                onHeadsetPluggedInChanged(isPluggedIn);
44            }
45        }
46    }
47
48    private final WiredHeadsetBroadcastReceiver mReceiver;
49    private boolean mIsPluggedIn;
50    /**
51     * ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is
52     * load factor before resizing, 1 means we only expect a single thread to
53     * access the map so make only a single shard
54     */
55    private final Set<Listener> mListeners = Collections.newSetFromMap(
56            new ConcurrentHashMap<Listener, Boolean>(8, 0.9f, 1));
57
58    WiredHeadsetManager(Context context) {
59        mReceiver = new WiredHeadsetBroadcastReceiver();
60
61        AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
62        mIsPluggedIn = audioManager.isWiredHeadsetOn();
63
64        // Register for misc other intent broadcasts.
65        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);
66        context.registerReceiver(mReceiver, intentFilter);
67    }
68
69    void addListener(Listener listener) {
70        mListeners.add(listener);
71    }
72
73    void removeListener(Listener listener) {
74        if (listener != null) {
75            mListeners.remove(listener);
76        }
77    }
78
79    boolean isPluggedIn() {
80        return mIsPluggedIn;
81    }
82
83    private void onHeadsetPluggedInChanged(boolean isPluggedIn) {
84        if (mIsPluggedIn != isPluggedIn) {
85            Log.v(this, "onHeadsetPluggedInChanged, mIsPluggedIn: %b -> %b", mIsPluggedIn,
86                    isPluggedIn);
87            boolean oldIsPluggedIn = mIsPluggedIn;
88            mIsPluggedIn = isPluggedIn;
89            for (Listener listener : mListeners) {
90                listener.onWiredHeadsetPluggedInChanged(oldIsPluggedIn, mIsPluggedIn);
91            }
92        }
93    }
94}
95