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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.telecom;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.AudioManager;
import com.android.internal.util.IndentingPrintWriter;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
/** Listens for and caches headset state. */
class WiredHeadsetManager {
interface Listener {
void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn);
}
/** Receiver for wired headset plugged and unplugged events. */
private class WiredHeadsetBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_HEADSET_PLUG)) {
boolean isPluggedIn = mAudioManager.isWiredHeadsetOn();
Log.v(WiredHeadsetManager.this, "ACTION_HEADSET_PLUG event, plugged in: %b",
isPluggedIn);
onHeadsetPluggedInChanged(isPluggedIn);
}
}
}
private final WiredHeadsetBroadcastReceiver mReceiver;
private final AudioManager mAudioManager;
private boolean mIsPluggedIn;
/**
* ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is
* load factor before resizing, 1 means we only expect a single thread to
* access the map so make only a single shard
*/
private final Set<Listener> mListeners = Collections.newSetFromMap(
new ConcurrentHashMap<Listener, Boolean>(8, 0.9f, 1));
WiredHeadsetManager(Context context) {
mReceiver = new WiredHeadsetBroadcastReceiver();
mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
mIsPluggedIn = mAudioManager.isWiredHeadsetOn();
// Register for misc other intent broadcasts.
IntentFilter intentFilter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);
context.registerReceiver(mReceiver, intentFilter);
}
void addListener(Listener listener) {
mListeners.add(listener);
}
void removeListener(Listener listener) {
if (listener != null) {
mListeners.remove(listener);
}
}
boolean isPluggedIn() {
return mIsPluggedIn;
}
private void onHeadsetPluggedInChanged(boolean isPluggedIn) {
if (mIsPluggedIn != isPluggedIn) {
Log.v(this, "onHeadsetPluggedInChanged, mIsPluggedIn: %b -> %b", mIsPluggedIn,
isPluggedIn);
boolean oldIsPluggedIn = mIsPluggedIn;
mIsPluggedIn = isPluggedIn;
for (Listener listener : mListeners) {
listener.onWiredHeadsetPluggedInChanged(oldIsPluggedIn, mIsPluggedIn);
}
}
}
/**
* Dumps the state of the {@link WiredHeadsetManager}.
*
* @param pw The {@code IndentingPrintWriter} to write the state to.
*/
public void dump(IndentingPrintWriter pw) {
pw.println("mIsPluggedIn: " + mIsPluggedIn);
}
}
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