AudioFocusHelper.java

package me.pjq.pushup.audio;

import android.content.Context;
import android.media.AudioManager;

public class AudioFocusHelper implements
		AudioManager.OnAudioFocusChangeListener {
	AudioManager mAudioManager;

	Context mContext;

	RecorderAndPlaybackAudioRecorderImpl.OnAudioFocusChangeListener mListener;

	// other fields here, you'll probably hold a reference to an interface
	// that you can use to communicate the focus changes to your Service

	public AudioFocusHelper(Context ctx, RecorderAndPlaybackAudioRecorderImpl.OnAudioFocusChangeListener listener) {
		mContext = ctx;
		mListener = listener;
		mAudioManager = (AudioManager) mContext
				.getSystemService(Context.AUDIO_SERVICE);
	}

	public boolean requestFocus() {
		return AudioManager.AUDIOFOCUS_REQUEST_GRANTED == mAudioManager
				.requestAudioFocus(this, AudioManager.STREAM_MUSIC,
						AudioManager.AUDIOFOCUS_GAIN);
	}

	public boolean abandonFocus() {
		return AudioManager.AUDIOFOCUS_REQUEST_GRANTED == mAudioManager
				.abandonAudioFocus(this);
	}

	@Override
	public void onAudioFocusChange(int focusChange) {
		if (null != mListener) {
			mListener.onAudioFocusChange(focusChange);
		}
	}
}