ListView之BaseAdapter

BaseAdapter可以实现自定义的丰富子项视图，本文实现如下所示结果：

实现代码：

/*
ListView :列表

BaseAdapter 通用的基础适配器



 * 
 * */
public class BaseAdapter_test extends Activity {

    
    private ListView listview;
    private int[] images=new int[]{
            R.drawable.s1,
            R.drawable.s2,
            R.drawable.s3,
            R.drawable.s4,
            R.drawable.s5};
    
    private BaseAdapter adapter;
    private Context context;
    private List<Map<String,Object>> datas;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.baseadapate);
        context = this;
        listview = (ListView) findViewById(R.id.listview);
    
        initData();
        
       adapter=new MyAdapter();
     
        listview.setAdapter(adapter);
        
        listview.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                
                Toast.makeText(context,"你选中的listview是："+ datas.get(position).get("map_content"), 0).show();
            }
        });
        
    }
//自定义适配器
    private class MyAdapter extends BaseAdapter
    {

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return datas.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return datas.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        
        ViewHolder viewHolder;
        if(convertView==null)//重用view
        {
            
                viewHolder=new ViewHolder();
            
                convertView=LayoutInflater.from(context).inflate(R.layout.items, null);
            viewHolder.image=(ImageView) convertView.findViewById(R.id.image);
            viewHolder.content=(TextView)convertView.findViewById(R.id.content);
            viewHolder.button =(Button)convertView.findViewById(R.id.button);
            convertView.setTag(viewHolder);
        }
        else
        {
            viewHolder=(ViewHolder) convertView.getTag();
        }
        //给每一个item中的控件赋值
        final Map mymap=datas.get(position);
        viewHolder.image.setImageBitmap((Bitmap) mymap.get("map_image"));
        viewHolder.content.setText(mymap.get("map_content")+"");
        viewHolder.button.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "你选中的adapter是:"+mymap.get("map_content"), 1).show();
                
            }
        });
        
        return convertView;
    }
        
        
    }

    private class ViewHolder
    {
        public ImageView image;
        public TextView content;
        public Button button;
        
    }
    private void initData() {
        
        datas = new ArrayList<Map<String,Object>>();
        for(int i=0;i<5;i++)
        {
            Map<String,Object> map = new HashMap<String, Object>();
            map.put("map_image",BitmapFactory.decodeResource(getResources(), images[i]));
            map.put("map_content", "hahacontent"+i);
            datas.add(map);
        }
    }
    
    
}

baseadapate.xml

<?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" >
    
    <ListView 
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/listview"
        >
        
    </ListView>

</LinearLayout>

items.xml

<?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="horizontal" 
    android:layout_gravity="center"
    
    >

    <ImageView
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:background="@drawable/ic_launcher"
        />

    <TextView
        
        android:id="@+id/content"
        android:layout_width="0px"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="haa" 
        
        />

    
    <Button 
         android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:text="购买"
        android:focusable="false"
        />
</LinearLayout>