Android中自制通訊錄用系統自帶佈局從數據庫中讀出顯示

請結合前幾篇文章 來學習此代碼：

/**
 * 
 * @author chrp
 *
 *如用系統自帶佈局
 */
public class MainActivity_03 extends Activity {

	//listView控件
	public ListView listView;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	
		//根據id獲取控件對象
		listView = (ListView) findViewById(R.id.listView);
		
		List<String> data = new ArrayList<String>();
		
		data.add("測試數據1");
		data.add("測試數據2");
		data.add("測試數據3");
		data.add("測試數據4");
	
		
		listView.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, android.R.id.text1,data));
		
		//設置顯示的數據 Adpater
		//listView.setAdapter(new ArrayAdapter<String>(this, R.layout.listview_array, R.id.tv_name, data));
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	

}

//----------------------------------------------------------------------------

//------------第二種方式-----------------------------------

public class MainActivity_04 extends Activity {

	// listView控件
	public ListView listView;
	// 顯示所有的用戶信息
	public List<Person> persons;
	// 數據庫操作的對象
	public PersonDao personDao;
	// 佈局的充氣泵
	public LayoutInflater inflater;

	// map結構
	private List<Map<String, String>> datas;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		// 實例化數據庫操作對象
		personDao = new PersonDaoImpl(MainActivity_04.this);

		// 執行查詢數據
		persons = personDao.findAll();
		// 實例化集合
		datas = new ArrayList<Map<String, String>>();

		for (Person p : persons) {
			// 創建map對象
			Map<String, String> map = new HashMap<String, String>();
			// map對象存值
			map.put("name", p.getName());
			map.put("phone", p.getPhone());
			// 加入到集合
			datas.add(map);
		}

		// 根據服務獲取inflater對象
		inflater = (LayoutInflater) this
				.getSystemService(LAYOUT_INFLATER_SERVICE);

		// 根據id獲取控件對象
		listView = (ListView) findViewById(R.id.listView);
		// 設置顯示的數據 Adpater

		listView.setAdapter(new SimpleAdapter(this, datas,
				android.R.layout.simple_list_item_2, new String[] { "name",
						"phone" }, new int[] { android.R.id.text1,
						android.R.id.text2 }));

		/*
		 * //listView註冊事件 listView.setOnItemClickListener(new
		 * AdapterView.OnItemClickListener() {
		 *//**
		 * parent :listView view 每個條目控件 position:條目所在的位置 id：行號 0
		 */
		/*
		 * @Override public void onItemClick(AdapterView<?> parent, View view,
		 * int position, long id) {
		 * 
		 * //獲取每個條目顯示的對象 Person p = (Person) parent.getItemAtPosition(position);
		 * Toast.makeText(getApplicationContext(), p.getName()+"-"+p.getPhone(),
		 * Toast.LENGTH_LONG).show(); }
		 * 
		 * });
		 */
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}