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 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. */
32class WiredHeadsetManager {
33    interface Listener {
34        void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn);
35    }
36
37    /** Receiver for wired headset plugged and unplugged events. */
38    private class WiredHeadsetBroadcastReceiver extends BroadcastReceiver {
39        @Override
40        public void onReceive(Context context, Intent intent) {
41            if (intent.getAction().equals(Intent.ACTION_HEADSET_PLUG)) {
42                boolean isPluggedIn = intent.getIntExtra("state", 0) == 1;
43                Log.v(WiredHeadsetManager.this, "ACTION_HEADSET_PLUG event, plugged in: %b",
44                        isPluggedIn);
45                onHeadsetPluggedInChanged(isPluggedIn);
46            }
47        }
48    }
49
50    private final WiredHeadsetBroadcastReceiver mReceiver;
51    private boolean mIsPluggedIn;
52    /**
53     * ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is
54     * load factor before resizing, 1 means we only expect a single thread to
55     * access the map so make only a single shard
56     */
57    private final Set<Listener> mListeners = Collections.newSetFromMap(
58            new ConcurrentHashMap<Listener, Boolean>(8, 0.9f, 1));
59
60    WiredHeadsetManager(Context context) {
61        mReceiver = new WiredHeadsetBroadcastReceiver();
62
63        AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
64        mIsPluggedIn = audioManager.isWiredHeadsetOn();
65
66        // Register for misc other intent broadcasts.
67        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);
68        context.registerReceiver(mReceiver, intentFilter);
69    }
70
71    void addListener(Listener listener) {
72        mListeners.add(listener);
73    }
74
75    void removeListener(Listener listener) {
76        if (listener != null) {
77            mListeners.remove(listener);
78        }
79    }
80
81    boolean isPluggedIn() {
82        return mIsPluggedIn;
83    }
84
85    private void onHeadsetPluggedInChanged(boolean isPluggedIn) {
86        if (mIsPluggedIn != isPluggedIn) {
87            Log.v(this, "onHeadsetPluggedInChanged, mIsPluggedIn: %b -> %b", mIsPluggedIn,
88                    isPluggedIn);
89            boolean oldIsPluggedIn = mIsPluggedIn;
90            mIsPluggedIn = isPluggedIn;
91            for (Listener listener : mListeners) {
92                listener.onWiredHeadsetPluggedInChanged(oldIsPluggedIn, mIsPluggedIn);
93            }
94        }
95    }
96
97    /**
98     * Dumps the state of the {@link WiredHeadsetManager}.
99     *
100     * @param pw The {@code IndentingPrintWriter} to write the state to.
101     */
102    public void dump(IndentingPrintWriter pw) {
103        pw.println("mIsPluggedIn: " + mIsPluggedIn);
104    }
105}
106