Android采用ListView实现数据列表显示

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<HashMap<String, Object>>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"?><!--item --><LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="horizontal"  android:layout_width="fill_parent"  android:layout_height="fill_parent">  <!-- 名称 -->  <TextView   android:layout_width="130dp"   android:layout_height="wrap_content"   android:id="@+id/name"  />  <!-- 电话 -->  <TextView   android:layout_width="150dp"   android:layout_height="wrap_content"   android:id="@+id/phone"  />  <!-- 存款 -->  <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"    > <!-- 标题 --> <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控件 --><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"