myList.setAdapter(adapter);报空指针异常。

//初始化view
private void initView() {

    list = new ArrayList<MusicInfo>();
    //把扫描到的音乐赋值给list 
    list = com.example.music.MusicUtil.getMp3Infos(this);//此处可获得数据
    adapter = new com.example.music.MusicListAdapter(this,list);
    myList.setAdapter(adapter);

    mediaPlayer = new MediaPlayer();
    myList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            //创建一个播放音频的方法，把点击到的地址传过去
            //list.get(i).path这个就是歌曲的地址
            play(list.get(i).getUrl());
        }
    });
}

myList需要先new实例化