- 播放声音      - MediaPlayer 播放器, 同时只能播放一个音乐. 可以播放大文件. 播放背景音乐.                MediaPlayer mediaPlayer = new MediaPlayer();              mediaPlayer.setDataSource("/mnt/sdcard/bgmusic.mp3");              mediaPlayer.prepare(); // 准备.              mediaPlayer.start();                或                MediaPlayer mediaPlayer = MediaPlayer.create(MainActivity.this,                              R.raw.music);              mediaPlayer.start();        - SoundPool 声音池, 同时播放多个声音(混合音效). 只允许申请1M的内存空间.                SoundPool sp = new SoundPool(1, AudioManager.STREAM_MUSIC, 0);              shoot1id = sp.load("/mnt/sdcard/shoot1.ogg", 1);                sp.play(shoot1id, 1f, 1f, 0, 0, 1.0f);