setonclicklistener事件中如何改变其他控件的属性

public View getView(int arg0, View arg1, ViewGroup arg2) {

        if(arg1==null){
            arg1=layoutInflater.inflate(R.layout.items, null);
        }

        ImageView musicflag = (ImageView) arg1.findViewById(R.id.musicflag);
        TextView musicname=(TextView) arg1.findViewById(R.id.musicname);
        TextView musicsinger=(TextView) arg1.findViewById(R.id.musicsingers);
         final ImageView musicplay = (ImageView) arg1.findViewById(R.id.musicatt);
        musicflag.setImageResource(R.drawable.music);
        musicname.setText(musics[arg0]);
        musicsinger.setText(musicsingers[arg0]);
        musicplay.setImageResource(R.drawable.play);

        listView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {

                //Toast.makeText(MainActivity.this, arg2+"", Toast.LENGTH_SHORT).show();
                /*if (flag==0) {
                    musicplay.setImageResource(R.drawable.pause);
                    flag=1;
                }else if (flag==1) {
                    musicplay.setImageResource(R.drawable.play);
                    flag=0;
                }*/
                **musicplay.setImageResource(R.drawable.pause);_**


                Toast.makeText(MainActivity.this, flag+"", Toast.LENGTH_SHORT).show();

                Intent intent = new Intent("MusicPlay");
                Bundle bundle = new Bundle();
                bundle.putInt("song", arg2);
                intent.putExtra("int", bundle);
                sendBroadcast(intent);
            }
        });

为什么musicplay.setImageResource(R.drawable.pause);这句话不能执行，图片没有更改

listView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {
                                        ImageView musicplay = (ImageView) arg1.findViewById(R.id.musicatt);//这里重新获取当前点击的item对应的musicplay,不然musicplay是指向最后一个item的。
                //Toast.makeText(MainActivity.this, arg2+"", Toast.LENGTH_SHORT).show();
                /*if (flag==0) {
                    musicplay.setImageResource(R.drawable.pause);