使用MediaPlayer的简单音乐播放器功能

public class MusicPlayerActivity extends Activity implements OnClickListener,OnPreparedListener,OnCompletionListener,OnErrorListener,OnSeekCompleteListener{

private MediaPlayer mediaPlayer = null;
private int isPause = 1;
private boolean flag = false;
private int index = 0;
private List<String> list = null;
private String PATH = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC).getAbsolutePath();
private int position = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mediaplayer);

Button bt1 = (Button) findViewById(R.id.bt_music_play_pause);
Button bt2 = (Button) findViewById(R.id.bt_music_last);
Button bt3 = (Button) findViewById(R.id.bt_music_next);

bt1.setOnClickListener(this);
bt2.setOnClickListener(this);
bt3.setOnClickListener(this);

initMediaPlayer();
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.bt_music_play_pause:
if(flag){
play();
}else{
pause();
}
flag = !flag;
break;

case R.id.bt_music_last:
last();
break;

case R.id.bt_music_next:
next();
break;
default:
break;
}
}

private void next() {
// TODO Auto-generated method stub
if(list.size() == (index + 1) ){
index = 0;
}else{
index ++;
}
start();
}

private void last() {
// TODO Auto-generated method stub
if(0 == index){
index = list.size() - 1;
}else{
index --;
}
start();
}

private void pause() {
// TODO Auto-generated method stub
if(mediaPlayer.isPlaying()){
position = mediaPlayer.getCurrentPosition();
mediaPlayer.pause();
isPause = 0;
}
}

private void play() {
// TODO Auto-generated method stub
start();
}

private void start() {
// TODO Auto-generated method stub
if(mediaPlayer.isPlaying()){
mediaPlayer.stop();
}
mediaPlayer.reset();
try {
mediaPlayer.setDataSource(PATH + "/" + list.get(index));
mediaPlayer.prepareAsync();//异步准备
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void initMediaPlayer(){
mediaPlayer = new MediaPlayer();//初始化MediaPlayer
mediaPlayer.reset();
mediaPlayer.setOnCompletionListener(this);
mediaPlayer.setOnErrorListener(this);
mediaPlayer.setOnPreparedListener(this);
mediaPlayer.setOnSeekCompleteListener(this);

list = new ArrayList<String>();
File[] files = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC).listFiles();
for (int i = 0; i < files.length; i++) {
if(files[i].isFile() && files[i].getName().endsWith(".mp3")){
list.add(files[i].getName());
}
}
}

/**
* 播放当前歌曲完成
*/
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
Log.e("antion=", "onCompletion");
last();
}
/**
* 准备完成的监听
*/
@Override
public void onPrepared(MediaPlayer mp) {
// TODO Auto-generated method stub
Log.e("antion=", "onPrepared");
mp.start();
switch (isPause) {
case 0:
mediaPlayer.seekTo(position);
break;

default:
break;
}
isPause = 1;
}
/**
* 发生错误
*/
@Override
public boolean onError(MediaPlayer mp, int arg1, int arg2) {
// TODO Auto-generated method stub
Log.e("antion=", "onError");
mp.stop();//将音乐暂停
mp.release();//释放资源
return false;
}

@Override
public void onSeekComplete(MediaPlayer mp) {
// TODO Auto-generated method stub
Log.e("antion=", "onSeekComplete");
}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
if(mediaPlayer.isPlaying()){
mediaPlayer.stop();
}
mediaPlayer.release();
}
}