Android采用ListView實現數據列表顯示

要將數據庫中的數據列表顯示在屏幕上，我們要使用ListView這個控件，當用戶從數據庫中取出數據時，要將數據綁定到顯示控件上，如何綁定呢，我們需要創建適配器進行綁定，創建適配器有兩種方式：

第一種是用SimpleAdapter創建（要求綁定的數據是List<HashMap<String, Object>>數據類型）

第二種是用SimpleCursorAdapter創建（要求綁定的數據是Cursor數據類型）

顯示效果如圖所示：

界面布局:

item.xml

main.xml

使用SimpleAdapter進行數據綁定

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);
//獲取到集合數據
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);
}
//創建SimpleAdapter適配器將數據綁定到item顯示控件上
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});
//實現列表的顯示
listView.setAdapter(adapter);
//條目點擊事件
listView.setOnItemClickListener(new ItemClickListener());
}
//獲取點擊事件
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進行數據綁定

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);
//獲取游標
Cursor cursor = service.getCursorScrollData(0, 10);
//創建SimpleCursorAdapter適配器將數據綁定到item顯示控件上
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);
//條目點擊事件
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：使用第二種方式在獲取數據集合時必須指定主鍵"_id"