Android Open Source - PlayerHater Audio Focus Plugin

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License

The source code is released under:

Apache License

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Java Source Code

/*******************************************************************************
 * Copyright 2013 Chris Rhoden, Rebecca Nesson, Public Radio Exchange
 *//from www.  ja  v  a2 s . co m
 * 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 org.prx.playerhater.plugins;

import android.annotation.TargetApi;
import android.content.ComponentName;
import android.content.Context;
import android.media.AudioManager;
import android.os.Build;

import org.prx.playerhater.BroadcastReceiver;
import org.prx.playerhater.PlayerHater;
import org.prx.playerhater.broadcast.OnAudioFocusChangedListener;
import org.prx.playerhater.wrappers.ServicePlayerHater;

@TargetApi(Build.VERSION_CODES.FROYO)
public class AudioFocusPlugin extends AbstractPlugin {
    private AudioManager mAudioService;
    private OnAudioFocusChangedListener mAudioFocusChangeListener;
    private ComponentName mEventReceiver;

    public AudioFocusPlugin() {
    }

    @Override
    public void onPlayerHaterLoaded(Context context, PlayerHater playerHater) {
        super.onPlayerHaterLoaded(context, playerHater);
        if (!(playerHater instanceof ServicePlayerHater)) {
            throw new IllegalArgumentException(
                    "AudioFocusPlugin must be run on the server side");
        }
        mAudioFocusChangeListener = new OnAudioFocusChangedListener(
                (ServicePlayerHater) playerHater);
    }

    @Override
    public void onAudioStarted() {
        getAudioManager().requestAudioFocus(mAudioFocusChangeListener,
                AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
        getAudioManager().registerMediaButtonEventReceiver(getEventReceiver());
    }

    @Override
    public void onAudioStopped() {
        getAudioManager().abandonAudioFocus(mAudioFocusChangeListener);
        getAudioManager()
                .unregisterMediaButtonEventReceiver(getEventReceiver());
    }

    protected AudioManager getAudioManager() {
        if (mAudioService == null) {
            mAudioService = (AudioManager) getContext().getSystemService(
                    Context.AUDIO_SERVICE);
        }
        return mAudioService;
    }

    protected ComponentName getEventReceiver() {
        if (mEventReceiver == null) {
            mEventReceiver = new ComponentName(getContext(),
                    BroadcastReceiver.class);
        }
        return mEventReceiver;
    }
}

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