android音频播放

第一行代码学习笔记
1、创建一个 MediaPlayer 对象
2、调用 setDataSource()方法来设置音频文件的路径
3、 控制方法，prepare()，start()，pause()， reset()
4、播放Video方法类似，需要添加VideoView
public class MainActivity extends Activity implements OnClickListener {

private Button play;

private Button pause;

private Button stop;

private MediaPlayer mediaPlayer = new MediaPlayer();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    play = (Button) findViewById(R.id.play);
    pause = (Button) findViewById(R.id.pause);
    stop = (Button) findViewById(R.id.stop);
    play.setOnClickListener(this);
    pause.setOnClickListener(this);
    stop.setOnClickListener(this);
    initMediaPlayer();
}

private void initMediaPlayer() {
    try {
        File file = new File(Environment.getExternalStorageDirectory(), "music.mp3");
        //设定路径
        mediaPlayer.setDataSource(file.getPath());
        mediaPlayer.prepare();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
    case R.id.play:
        if (!mediaPlayer.isPlaying()) {
            mediaPlayer.start();
        }
        break;
    case R.id.pause:
        if (mediaPlayer.isPlaying()) {
            mediaPlayer.pause();
        }
        break;
    case R.id.stop:
        if (mediaPlayer.isPlaying()) {
            mediaPlayer.reset();
            initMediaPlayer();
        }
        break;
    default:
        break;
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();
    if (mediaPlayer != null) {
        mediaPlayer.stop();
        mediaPlayer.release();
    }
}

}