        //创建自定义的MyAdapter对象
        MyAdapter adapter=new MyAdapter(this,R.layout.list_item,list,from,to);

        //调用ListView的setAdapter()方法设置适配器
        listView.setAdapter(adapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}