ListView入门

m : model      数据模型   List<Person>

v : view       界面       Listview
c : controller 控制器     Adapter 数据适配器


实现getCount 返回总的个数

实现getView  返回每个位置对应的view对象

 

 

public class MainActivity extends Activity {

      private  ListView  lv;

      

      @Override

      protected void onCreate(Bundle savedInstanceState) {

             super.onCreate(savedInstanceState);

            setContentView(R.layout. activity_main);

            

            

            ListView  lv= (ListView) findViewById(R.id. lv);

            lv.setAdapter( new myAdapter());

            

            

            

      }

      /**

       * 创建一个适配器

       * @author Administrator

       *

       */

      public class myAdapter extends  BaseAdapter{

             @Override

             public int getCount() {

            

                   return Integer. MAX_VALUE;

            }

      

             @Override

             public View getView( int position, View convertView, ViewGroup parent) {

                  TextView  tv= null;

                   if(position%3==0){

                   tv= new TextView(MainActivity. this);      

                   tv.setText( "苹果");

                  }

                   else if(position%3==1){

                         tv= new TextView(MainActivity. this);      

                         tv.setText( "香蕉");

                  }

                   else if(position%3==2){

                         tv= new TextView(MainActivity. this);      

                         tv.setText( "西瓜");

                  }

                  

                   return tv;

            }

            

            

             @Override

             public Object getItem( int position) {

                   // TODO Auto-generated method stub

                   return null;

            }

             @Override

             public long getItemId( int position) {

                   // TODO Auto-generated method stub

                   return 0;

            }

            

            

            

            

      }