BaseAdapter 解决卡的问题

//获取数据
		private ArrayList<HashMap<String,Object>> getData(){
			ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String,Object>>();
			/**为动态数组添加数据*/    
			for(int i=0;i<500;i++) 
			{ 
				HashMap<String, Object> map = new HashMap<String, Object>(); 
				map.put("ItemTitle", "第"+i+"行"); 
				map.put("ItemText", "这是第"+i+"行"); 
				listItem.add(map); 
			}
			return listItem;
		}

首先新建一个item.xml,作为listview 的每一项布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
	<TextView
	                android:id="@+id/txt_title_main"
	                android:layout_width="wrap_content"
	                android:layout_height="wrap_content"
	                android:text="TextView" />

            <TextView
                android:id="@+id/txt_title_sub"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="TextView" />
            
            <Button
            android:id="@+id/btn_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button" />
    

</LinearLayout>

然后就是BaseAdapter的编写

代码片断

//新建一个类继承BaseAdapter，实现视图与数据的绑定
		private class MyAdapter extends BaseAdapter {
			
			private LayoutInflater mInflater;
			
			public MyAdapter(Context context) {
				 this.mInflater = LayoutInflater.from(context);
			}

			@Override
			public int getCount() {
				return getData().size();//返回数组长度
			}

			@Override
			public Object getItem(int position) {
				return null;
			}

			@Override
			public long getItemId(int position) {
				return 0;
			}

			@Override
			public View getView( int position, View convertView, ViewGroup parent) {
				//观察convertView随ListView滚动情况
				View view;
				ViewHolder viewHolder;
				
				if(convertView == null){
					view = mInflater.inflate(R.layout.item, null);
					TextView maintitle= (TextView) view.findViewById(R.id.txt_title_main);
					TextView subtitle= (TextView) view.findViewById(R.id.txt_title_sub);
					viewHolder = new ViewHolder(maintitle, subtitle);
					view.setTag(viewHolder);
				}else{
					view = convertView ;
					viewHolder = (ViewHolder) view.getTag();
				}
				
				/**设置TextView显示的内容，即我们存放在动态数组中的数据*/
				viewHolder.maintitle.setText("by position" + position);
				viewHolder.subtitle.setText("by position" + position);
				
				
				return view;
			}
			
		}
		
		class ViewHolder {  
		    
		    TextView maintitle;  
		    TextView subtitle;  
			
		    public ViewHolder(TextView maintitle, TextView subtitle){
		        this.maintitle = maintitle;  
		        this.subtitle = subtitle;  
		    }         
		    
		}  

lv_show=(ListView) rootView.findViewById(R.id.lv_show);
MyAdapter adapter=new MyAdapter(getActivity());
			
			
lv_show.setAdapter(adapter);