android ListView数据显示

要将数据库中的数据列表显示在屏幕上，我们要使用ListView这个控件，当用户从数据库中取出数据时，要将数据绑定到显示控件上，如何绑定呢，我们需要创建适配器进行绑定，创建适配器有两种方式：

第一种是用SimpleAdapter创建（要求绑定的数据是List>数据类型）

第二种是用SimpleCursorAdapter创建（要求绑定的数据是Cursor数据类型）

显示效果如图所示：

 

界面布局:

item.xml

 xml version="1.0" encoding="utf-8"?>

 <LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="horizontal"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent">

   <TextView
    android:layout_width="130dp"
    android:layout_height="wrap_content"
    android:id="@+id/name"
   />

   <TextView
    android:layout_width="150dp"
    android:layout_height="wrap_content"
    android:id="@+id/phone"
   />

   <TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:id="@+id/amount"
   />
 LinearLayout>

main.xml

 xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >

  <LinearLayout
   android:orientation="horizontal"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content">

   <TextView
    android:layout_width="130dp"
    android:layout_height="wrap_content"
    android:text="姓名"
   />

    <TextView
    android:layout_width="150dp"
    android:layout_height="wrap_content"
    android:text="电话"
   />

   <TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="存款"
   />

 LinearLayout>

 <ListView
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:id="@+id/listView"
     />
 LinearLayout>

 使用SimpleAdapter进行数据绑定

 public class MainActivity extends Activity {
     private PersonService service;
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         service = new PersonService(this);
         ListView listView = (ListView) this.findViewById(R.id.listView);

         //获取到集合数据
         List<Person> persons = service.getScrollData(0, 10);
         List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();
         for(Person person : persons){
             HashMap<String, Object> item = new HashMap<String, Object>();
             item.put("id", person.getId());
             item.put("name", person.getName());
             item.put("phone", person.getPhone());
             item.put("amount", person.getAmount());
             data.add(item);
         }
        //创建SimpleAdapter适配器将数据绑定到item显示控件上
        SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,
                 new String[]{"name", "phone", "amount"}, new int[]{R.id.name, R.id.phone, R.id.amount});
        //实现列表的显示
        listView.setAdapter(adapter);
        //条目点击事件
        listView.setOnItemClickListener(new ItemClickListener());
     }
        //获取点击事件
     private final class ItemClickListener implements OnItemClickListener{

         public void onItemClick(AdapterView> parent, View view, int position, long id) {
             ListView listView = (ListView) parent;
             HashMap<String, Object> data = (HashMap<String, Object>) listView.getItemAtPosition(position);
             String personid = data.get("id").toString();
             Toast.makeText(getApplicationContext(), personid, 1).show();
         }
     }
 }

 

 使用SimpleCursorAdapter进行数据绑定

 public class MainActivity extends Activity {
     private PersonService service;
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         service = new PersonService(this);
         ListView listView = (ListView) this.findViewById(R.id.listView);
         //获取游标
         Cursor cursor = service.getCursorScrollData(0, 10);
         //创建SimpleCursorAdapter适配器将数据绑定到item显示控件上
         SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.item, cursor,
                 new String[]{"name", "phone", "amount"}, new int[]{R.id.name, R.id.phone, R.id.amount});
         listView.setAdapter(adapter);
         //条目点击事件
         listView.setOnItemClickListener(new ItemClickListener());
     }

     private final class ItemClickListener implements OnItemClickListener{

         public void onItemClick(AdapterView> parent, View view, int position, long id) {
             ListView listView = (ListView) parent;
             Cursor cursor = (Cursor) listView.getItemAtPosition(position);
             String personid = String.valueOf(cursor.getInt(cursor.getColumnIndex("_id")));
             Toast.makeText(getApplicationContext(), personid, 1).show();
         }
     }
 }

注意：使用第二种方式在获取数据集合时必须指定主键"_id"