Adapter详解 - JAVA - 编程开发网

动态添加数据适配器adapter

Adapter是适配器，许多UI组件需要搭配Adapter来显示界面，例如Spinner与ListView,另外当我们需要动态的添加数据给UI组件时就需要Adapter了。

我们来介绍几个常见的Adapter：

ArrayAdapter(comman)
SimpleAdapter extends Baseadapter(comman)
******************************************************************************

这两个适配器非常常见，也非常有用，通常传输的数据可以是ArrayList<>封装的数据。

示例如下：ArrayAdapter

[java]
private String[] string={"china","america","japan"};
List list=new ArrayList();
for(int i=0;i {
list.add(string[i]);
}
ArrayAdapter adapter=new ArrayAdapter(this,R.layout.simple_spinner_item,list);

private String[] string={"china","america","japan"};
List list=new ArrayList();
for(int i=0;i {
list.add(string[i]);
}
ArrayAdapter adapter=new ArrayAdapter(this,R.layout.simple_spinner_item,list);首先我们定义封装数据，然后再定义Adapter，最后调用setAdapter（）方法。

ArrayAdapter有三个参数，第一个参数为Activity.this,第三个参数为动态添加给adapter的数据
对于第二个数据：
R.layout.simple_spinner_item:意思是将数据传给一个简单地TextView组件

示例：SimpleAdapter

[java]
public class SimpleAdapter extends Activity{
private String[] names =new String[]{"nick","lebron","kobe","kevin"};
private int[] imgsIds[] =new Int[] {R.drawable.1,R.drawable.2,R.drawable.3,R.drawable.4};
@Override
public void onCreate(Bundle savedInsatnceState)
{
super.onCreate(savedInsatnceState);
setTitle("simpleadapter");
setContentView(R.layout.main);
List list=new ArrayList（）;//创建动态数组ArrayList
for(int i=0;i Map map=new HashMap=;
map.put("name",names[i]);
map.put("headerImg",imgsIds[i]);
list.add(map);
}
SimpleAdapter adapter=new SimpleAdaper(this,list,R.layout.main,new String[]{"name","headerImg"},new int[]{R.id.name,R.id.headerImg});
ListView list=(ListView)findViewById(R.id.mylist);
list.setAdaper(adapter);
}
}

public class SimpleAdapter extends Activity{
private String[] names =new String[]{"nick","lebron","kobe","kevin"};
private int[] imgsIds[] =new Int[] {R.drawable.1,R.drawable.2,R.drawable.3,R.drawable.4};
@Override
public void onCreate(Bundle savedInsatnceState)
{
super.onCreate(savedInsatnceState);
setTitle("simpleadapter");
setContentView(R.layout.main);
List list=new ArrayList（）;//创建动态数组ArrayList
for(int i=0;i Map map=new HashMap=;
map.put("name",names[i]);
map.put("headerImg",imgsIds[i]);
list.add(map);
}
SimpleAdapter adapter=new SimpleAdaper(this,list,R.layout.main,new String[]{"name","headerImg"},new int[]{R.id.name,R.id.headerImg});
ListView list=(ListView)findViewById(R.id.mylist);
list.setAdaper(adapter);
}
}

接下来我们介绍另一个常用的Adapter：BaseAdapter
BaseAdapter implements SpinnerAdapter implements ListViewAdapter（可用于ListView和Spinner）

示例：

[java]
public MyListView extensds Activity{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInsatnceState);
mDate=getDate();
MyAdapter myadapter=new MyAdapter(this);
ListView list=(ListView)findById(R.id.myList);
setAdapter(myadapter);
}
private List> getData() {
List> list = new ArrayList>();
Map map = new HashMap();
map.put("title", "G1");
map.put("info", "google 1");
map.put("img", R.drawable.i1);
list.add(map);
//添加第二个Map数据
map = new HashMap();
map.put("title", "G2");
map.put("info",

Adapter详解 (一)