SoundPool问题 asset的使用

float j = 1.0f;
SoundPool sp = null;
int sID = 0;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Button b = (Button)findViewById(R.id.Button01);
    b.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            j = (float) (j +.5f);
            sp.setRate(sID,j);

        }
    });

    AssetFileDescriptor afd;
    try {

        sp = new SoundPool(1, AudioManager.STREAM_MUSIC, 0);

        afd = getAssets().openFd("wav/sample.wav");
        int id = sp.load(afd, 1);
        sID = sp.play(id, 1, 1, 1, 0, j);

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

SoundPool 大小文件在1m的样子，同时setrate的频率 在0.5- 2注意约束