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

1. <?xml version="1.0" encoding="utf-8"?>
2. <!--item -->
3. <LinearLayout
4. xmlns:Android="http://schemas.android.com/apk/res/android"
5. android:orientation="horizontal"
6. android:layout_width="fill_parent"
7. android:layout_height="fill_parent">
8. <!-- 名稱 -->
9. <TextView
10. android:layout_width="130dp"
11. android:layout_height="wrap_content"
12. android:id="@+id/name"
13. />
14. <!-- 電話 -->
15. <TextView
16. android:layout_width="150dp"
17. android:layout_height="wrap_content"
18. android:id="@+id/phone"
19. />
20. <!-- 存款 -->
21. <TextView
22. android:layout_width="fill_parent"
23. android:layout_height="wrap_content"
24. android:id="@+id/amount"
25. />
26. </LinearLayout>

main.xml

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="vertical"
4. android:layout_width="fill_parent"
5. android:layout_height="fill_parent"
6. >
7. <!-- 標題 -->
8. <LinearLayout
9. android:orientation="horizontal"
10. android:layout_width="fill_parent"
11. android:layout_height="wrap_content">
13. <TextView
14. android:layout_width="130dp"
15. android:layout_height="wrap_content"
16. android:text="姓名"
17. />
19. <TextView
20. android:layout_width="150dp"
21. android:layout_height="wrap_content"
22. android:text="電話"
23. />
25. <TextView
26. android:layout_width="fill_parent"
27. android:layout_height="wrap_content"
28. android:text="存款"
29. />
31. </LinearLayout>
32. <!-- ListView控件 -->
33. <ListView
34. android:layout_width="fill_parent"
35. android:layout_height="fill_parent"
36. android:id="@+id/listView"
37. />
38. </LinearLayout>

使用SimpleAdapter進行數據綁定

1. public class MainActivity extends Activity {
2. private PersonService service;
3. @Override
4. public void onCreate(Bundle savedInstanceState) {
5. super.onCreate(savedInstanceState);
6. setContentView(R.layout.main);
7. service = new PersonService(this);
8. ListView listView = (ListView) this.findViewById(R.id.listView);
10. //獲取到集合數據
11. List<Person> persons = service.getScrollData(0, 10);
12. List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();
13. for(Person person : persons){
14. HashMap<String, Object> item = new HashMap<String, Object>();
15. item.put("id", person.getId());
16. item.put("name", person.getName());
17. item.put("phone", person.getPhone());
18. item.put("amount", person.getAmount());
19. data.add(item);
20. }
21. //創建SimpleAdapter適配器將數據綁定到item顯示控件上
22. SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,
23. new String[]{"name", "phone", "amount"}, new int[]{R.id.name, R.id.phone, R.id.amount});
24. //實現列表的顯示
25. listView.setAdapter(adapter);
26. //條目點擊事件
27. listView.setOnItemClickListener(new ItemClickListener());
28. }
29. //獲取點擊事件
30. private final class ItemClickListener implements OnItemClickListener{
32. public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
33. ListView listView = (ListView) parent;
34. HashMap<String, Object> data = (HashMap<String, Object>) listView.getItemAtPosition(position);
35. String personid = data.get("id").toString();
36. Toast.makeText(getApplicationContext(), personid, 1).show();
37. }
38. }
39. }

使用SimpleCursorAdapter進行數據綁定

1. public class MainActivity extends Activity {
2. private PersonService service;
3. @Override
4. public void onCreate(Bundle savedInstanceState) {
5. super.onCreate(savedInstanceState);
6. setContentView(R.layout.main);
7. service = new PersonService(this);
8. ListView listView = (ListView) this.findViewById(R.id.listView);
9. //獲取游標
10. Cursor cursor = service.getCursorScrollData(0, 10);
11. //創建SimpleCursorAdapter適配器將數據綁定到item顯示控件上
12. SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.item, cursor,
13. new String[]{"name", "phone", "amount"}, new int[]{R.id.name, R.id.phone, R.id.amount});
14. listView.setAdapter(adapter);
15. //條目點擊事件
16. listView.setOnItemClickListener(new ItemClickListener());
17. }
19. private final class ItemClickListener implements OnItemClickListener{
21. public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
22. ListView listView = (ListView) parent;
23. Cursor cursor = (Cursor) listView.getItemAtPosition(position);
24. String personid = String.valueOf(cursor.getInt(cursor.getColumnIndex("_id")));
25. Toast.makeText(getApplicationContext(), personid, 1).show();
26. }
27. }
28. }

注意：使用第二種方式在獲取數據集合時必須指定主鍵"_id"