使用MediaPlayer为组件的各种状态播放声音效果（Button点击，Listview上下拉）

源码下载：http://download.csdn.net/detail/heng615975867/6546069



播放声音效果的类：

/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.
 *
 * 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.handmark.pulltorefresh.library.extras;

import java.util.HashMap;

import android.content.Context;
import android.media.MediaPlayer;
import android.view.View;

import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.State;

public class SoundPullEventListener<V extends View> implements PullToRefreshBase.OnPullEventListener<V> {

	private final Context mContext;
	private final HashMap<State, Integer> mSoundMap;

	private MediaPlayer mCurrentMediaPlayer;

	/**
	 * Constructor
	 * 
	 * @param context - Context
	 */
	public SoundPullEventListener(Context context) {
		mContext = context;
		mSoundMap = new HashMap<State, Integer>();
	}

	@Override
	public final void onPullEvent(PullToRefreshBase<V> refreshView, State event, Mode direction) {
		Integer soundResIdObj = mSoundMap.get(event);
		if (null != soundResIdObj) {
			playSound(soundResIdObj.intValue());
		}
	}

	/**
	 * Set the Sounds to be played when a Pull Event happens. You specify which
	 * sound plays for which events by calling this method multiple times for
	 * each event.
	 * <p/>
	 * If you've already set a sound for a certain event, and add another sound
	 * for that event, only the new sound will be played.
	 * 
	 * @param event - The event for which the sound will be played.
	 * @param resId - Resource Id of the sound file to be played (e.g.
	 *            <var>R.raw.pull_sound</var>)
	 */
	public void addSoundEvent(State event, int resId) {
		mSoundMap.put(event, resId);
	}

	/**
	 * Clears all of the previously set sounds and events.
	 */
	public void clearSounds() {
		mSoundMap.clear();
	}

	/**
	 * Gets the current (or last) MediaPlayer instance.
	 */
	public MediaPlayer getCurrentMediaPlayer() {
		return mCurrentMediaPlayer;
	}

//主要是MediaPlayer类播放res/raw的音频资源

private void playSound(int resId) {// Stop current player, if there's one playingif (null != mCurrentMediaPlayer) {mCurrentMediaPlayer.stop();mCurrentMediaPlayer.release();}mCurrentMediaPlayer = MediaPlayer.create(mContext, resId);if (null != mCurrentMediaPlayer)
{mCurrentMediaPlayer.start();}}}

使用方式：

private State mState = State.RESET;
sound.setState(mState);

MediaPlayer类播放res/raw的音频资源的另一个更好的方法：

private void initBeepSound() {
		if (playBeep && mediaPlayer == null) {
			// The volume on STREAM_SYSTEM is not adjustable, and users found it
			// too loud,
			// so we now play on the music stream.
			setVolumeControlStream(AudioManager.STREAM_MUSIC);
			mediaPlayer = new MediaPlayer();
			mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

			AssetFileDescriptor file = getResources().openRawResourceFd(
					R.raw.beep);
			AssetFileDescriptor file1 = getResources().openRawResourceFd(
					R.raw.voicemail);
			try {
				mediaPlayer.setDataSource(file.getFileDescriptor(),
						file.getStartOffset(), file.getLength());
				file.close();
				mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
				mediaPlayer.prepare();
			} catch (IOException e) {
				mediaPlayer = null;
			}
		}
	}