Android Open Source - PlayerHater On Audio Focus Changed Listener

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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2013 Chris Rhoden, Rebecca Nesson, Public Radio Exchange
 * // www .j  a  va2  s . c  o 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.broadcast;

import org.prx.playerhater.wrappers.ServicePlayerHater;

import android.annotation.TargetApi;
import android.media.AudioManager;
import android.os.Build;

@TargetApi(Build.VERSION_CODES.FROYO)
public class OnAudioFocusChangedListener implements
    AudioManager.OnAudioFocusChangeListener {

  // 5 seconds
  private static final int REWIND_ON_RESUME_DURATION = 5000;

  // 5 minutes
  private static final int SKIP_RESUME_AFTER_DURATION = 300000;

  private final ServicePlayerHater mPlayerHater;

  private long pausedAt;
  private boolean isBeingDucked;
  private boolean isBeingPaused;

  public OnAudioFocusChangedListener(ServicePlayerHater playerHater) {
    isBeingDucked = false;
    mPlayerHater = playerHater;
  }

  @Override
  public void onAudioFocusChange(int focusChange) {
    switch (focusChange) {
    case AudioManager.AUDIOFOCUS_GAIN:
      // Good, glad to hear it.
      if (isBeingPaused && !mPlayerHater.isPlaying()) {
        isBeingPaused = false;
        if (pausedAt + (SKIP_RESUME_AFTER_DURATION) > System
            .currentTimeMillis()) {
          mPlayerHater.play();
        }
      }

      if (isBeingDucked) {
        isBeingDucked = false;
        mPlayerHater.unduck();
      }
      break;
    case AudioManager.AUDIOFOCUS_LOSS:
      // Oh, no! Ok, let's handle that.
      if (mPlayerHater.isPlaying()) {
        mPlayerHater.pause();
      }
      break;
    case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
      // Let's pause, expecting it to come back.
      if (mPlayerHater.isPlaying()) {
        pausedAt = System.currentTimeMillis();
        isBeingPaused = true;
        mPlayerHater.pause();
        mPlayerHater.seekTo(Math.max(0,
            mPlayerHater.getCurrentPosition()
                - REWIND_ON_RESUME_DURATION));
      }
      break;
    case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
      if (mPlayerHater.isPlaying() && !isBeingDucked) {
        isBeingDucked = true;
        mPlayerHater.duck();
      }
      break;
    default:
      // Dunno.
    }
  }

}

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