ListVIew中插入view

public class MainActivity extends Activity {

    private ListView listview;
    private List<String> dataList = new ArrayList<String>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         listview = (ListView) findViewById(R.id.listview);
         initData();
         MyAdapter myAdapter = new MyAdapter();
         listview.setAdapter(myAdapter);
         //为listview设置点击监听
         listview.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                //标题
                if(position == 1|| position == 7){
                    return;
                }
                //数据
                Toast.makeText(MainActivity.this, "点击了第"+position+"条", 0).show();
            }
        });
        
    }
     private void initData() {
         for (int i = 0; i < 10; i++) {
            dataList.add("第"+i+"条数据");
        }
        
    }
    class MyAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            return dataList.size();
        }

        @Override
        public Object getItem(int position) {
            return dataList.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        /*
         * 总共显示10条数据   第2条和第8条显示文本  其他显示图片加文本(position)
         */
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
//注意:1.加载的是布局文件,返回的也是布局文件,
//　　　2.只有textview特殊能直接返回,imageView需要从布局中加载文件
            //屏幕滑出去会自动复用
            if(position == 1 || position == 7){
                TextView textView = new TextView(MainActivity.this);
                textView.setText(""+position);
                textView.setTextSize(30);
                textView.setTextColor(Color.BLUE);
                return textView;
            }
            ViewHolder viewHolder = null ;
//如果复用的view不为空,并且能转化为子类布局文件,获取viewHolder对象,否则加载布局文件,重新进行设置复用的view

if(convertView != null&&convertView instanceof LinearLayout){
                viewHolder = (ViewHolder) convertView.getTag();
                viewHolder.tv_text.setText("+"+dataList.get(position));
            }else{
                //加载布局
                viewHolder= new ViewHolder();
                convertView = View.inflate(MainActivity.this, R.layout.listview_item01, null);
                viewHolder.iv_image = (ImageView) convertView.findViewById(R.id.iv_image01);
                viewHolder.tv_text = (TextView) convertView.findViewById(R.id.tv_text01);
                viewHolder.tv_text.setText("+"+dataList.get(position));
                convertView.setTag(viewHolder);
            }
            
            return convertView;
        }
        class ViewHolder{
            private TextView tv_text;
            private ImageView iv_image;
        }
         
     }
}

Instanceof对象与类比较运算符

语法： 对象 instanceof 类    向下转型(大转小)父转子，必须强行转

    返回类型是boolean类型，非true即false

表示判断某个对象是否属于某个类

 

注意：这个比较运算符不能随便使用，必须用在类与类存在继承关系的时候使用

效果图: