Android listview与adapter详解及实例代码

<?xmlversion="1.0"encoding="utf-8"?> <LinearLayoutxmlns:android="
http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent" 
 android:layout_height="fill_parent"> <!-- 添加一个ListView控件 --> <ListView
 android:id="@+id/lv"  android:layout_width="fill_parent"  android:layout_height="fill_parent"/>   
 </LinearLayout>

publicclass MyListView extends Activity {
 
privatestaticfinal String[] strs = new String[] {
 "first", "second", "third", "fourth", "fifth"
 };//定义一个String数组用来显示ListView的内容private ListView lv;/** Called when the activity is first created. */
 @Override
publicvoid onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

lv = (ListView) findViewById(R.id.lv);//得到ListView对象的引用 /*为ListView设置Adapter来绑定数据*/ 
lv.setAdapter(new ArrayAdapter<String>(this,
    android.R.layout.simple_list_item_1, strs));

 }
}

 lv.setAdapter(newArrayAdapter<String>(this,

android.R.layout.simple_list_item_single_choice,strs));

lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
 

lv.setOnItemClickListener(new OnItemClickListener() {

   @Override
   publicvoid onItemClick(AdapterView<?> arg0, View arg1, int arg2,
     long arg3) {
     //点击后在标题上显示点击了第几行     setTitle("你点击了第"+arg2+"行");
   }
  });

<?xmlversion="1.0"encoding="utf-8"?>
 <RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_height="fill_parent" android:layout_width="fill_parent"> 
<ImageViewandroid:layout_alignParentRight="true" android:layout_width="wrap_content"
 android:layout_height="wrap_content" android:id="@+id/ItemImage"/> 
<TextViewandroid:id="@+id/ItemTitle" android:layout_height="wrap_content" 
android:layout_width="fill_parent" android:textSize="20sp"/>
 <TextViewandroid:id="@+id/ItemText" android:layout_height="wrap_content" 
android:layout_width="fill_parent" android:layout_below="@+id/ItemTitle"/> </RelativeLayout>

publicclass MyListViewSimple extends Activity {
 
 private ListView lv;
 /** Called when the activity is first created. */ @Override
publicvoid onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

lv = (ListView) findViewById(R.id.lv);/*定义一个动态数组*/   
 ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String,  Object>>();/*在数组中存放数据*/
 for(int i=0;i<10;i++) 
  { 
   HashMap<String, Object> map = new HashMap<String, Object>(); 
   map.put("ItemImage", R.drawable.icon);//加入图片   map.put("ItemTitle", "第"+i+"行"); 
   map.put("ItemText", "这是第"+i+"行"); 
   listItem.add(map); 
  } 

  SimpleAdapter mSimpleAdapter = new SimpleAdapter(this,listItem,//需要绑定的数据    
R.layout.item,//每一行的布局//动态数组中的数据源的键对应到定义布局的View中new String[] {"ItemImage"
,"ItemTitle", "ItemText"}, 
newint[] {R.id.ItemImage,R.id.ItemTitle,R.id.ItemText} 
   );

lv.setAdapter(mSimpleAdapter);//为ListView绑定适配器 lv.setOnItemClickListener(new 
OnItemClickListener() {

   @Override
   publicvoid onItemClick(AdapterView<?> arg0, View arg1, int arg2,
     long arg3) {
    setTitle("你点击了第"+arg2+"行");//设置标题栏显示点击的行    
   }
  });
 }
}

publicclass MyListViewBase extends Activity {
 
 private ListView lv;
 /*定义一个动态数组*/  ArrayList<HashMap<String, Object>>listItem;/** Called when the activity is first created. */ 
@Override
publicvoid onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

lv = (ListView) findViewById(R.id.lv);
  MyAdapter mAdapter = new MyAdapter(this);//得到一个MyAdapter对象lv.setAdapter(mAdapter);//为ListView绑定Adapter /*为ListView添加点击事件*/ 
lv.setOnItemClickListener(new OnItemClickListener() {

   @Override
   publicvoid onItemClick(AdapterView<?> arg0, View arg1, int arg2,
     long arg3) {
  Log.v("MyListViewBase", "你点击了ListView条目" + arg2);//在LogCat中输出信息    
   }
  });

 }/*添加一个得到数据的方法，方便使用*/ private ArrayList<HashMap<String, Object>> getDate(){
 
 ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String,  Object>>();
 /*为动态数组添加数据*/  for(int i=0;i<30;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;
 
 }/*  * 新建一个类继承BaseAdapter，实现视图与数据的绑定
  */ privateclass MyAdapter extends BaseAdapter {
 private LayoutInflater mInflater;//得到一个LayoutInfalter对象用来导入布局 /*构造函数*/ 
public MyAdapter(Context context) {
 this.mInflater = LayoutInflater.from(context);
  }

  @Override
  publicint getCount() {
   
   return getDate().size();//返回数组的长度  }

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

  @Override
  publiclong getItemId(int position) {
   return 0;
  }
  /*书中详细解释该方法*/   @Override
  public View getView(finalint position, View convertView, ViewGroup parent) {
    ViewHolder holder;
   //观察convertView随ListView滚动情况    
Log.v("MyListViewBase", "getView " + position + " " + convertView);
   if (convertView == null) {
      convertView = mInflater.inflate(R.layout.item,
 null);
      holder = new ViewHolder();
     /*得到各个控件的对象*/     
 holder.title = (TextView) convertView.findViewById(R.id.ItemTitle);
     holder.text = (TextView) convertView.findViewById(R.id.ItemText);
     holder.bt = (Button) convertView.findViewById(R.id.ItemButton);
     convertView.setTag(holder);//绑定ViewHolder对象     }
 else{
     holder = (ViewHolder)convertView.getTag();//取出ViewHolder对象     }
   /*设置TextView显示的内容，即我们存放在动态数组中的数据*/    
holder.title.setText(getDate().get(position).get("ItemTitle").toString());
   holder.text.setText(getDate().get(position).get("ItemText").toString());
   
   /*为Button添加点击事件*/    holder.bt.setOnClickListener(new OnClickListener() {
    
    @Override
    publicvoid onClick(View v) {
    Log.v("MyListViewBase", "你点击了按钮" + position);        //打印Button的点击信息     
    }
   });
   
   return convertView;
  }
 
 }/*存放控件*/ publicfinalclass ViewHolder{
 public TextView title;
 public TextView text;
 public Button bt;
 }
}