ListView_BaseAdapter

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    
	<TextView 
	    android:id="@+id/tv_name"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="名字"
	    android:textSize="25sp"
	    />
	<LinearLayout 
	    android:layout_alignParentRight="true"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:orientation="vertical"
	    >
	    <TextView 
	        android:id="@+id/tv_phone"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="號碼"
	    />
	    <TextView 
	        android:id="@+id/tv_salary"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="工資"
	    />
	</LinearLayout>
</RelativeLayout>

public class MainActivity extends Activity {

	List<Person> personList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        personList = new ArrayList<Person>();
        //把數據庫的數據查詢出來
        MyOpenHelper oh = new MyOpenHelper(this);
        SQLiteDatabase db =  oh.getWritableDatabase();
        Cursor cursor = db.query("person", null, null, null, null, null, null, null);
        while(cursor.moveToNext()){
        	String _id = cursor.getString(0);
        	String name = cursor.getString(1);
        	String salary = cursor.getString(2);
        	String phone = cursor.getString(3);
        	
        	Person p = new Person(_id, name, phone, salary);
        	personList.add(p);
        }
        
        ListView lv = (ListView) findViewById(R.id.lv);
        lv.setAdapter(new MyAdapter());
    }
    
    class MyAdapter extends BaseAdapter{

    	//系統調用，用來獲知集合中有多少條元素
		@Override
		public int getCount() {
			return personList.size();
		}
		
		//由系統調用，獲取一個View對象，作爲ListView的條目
		//position:本次getView方法調用所返回的View對象，在listView中是處於第幾個條目，那麼position的值就是多少
		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			Person p = personList.get(position);
			
//			TextView tv = new TextView(MainActivity.this);
			System.out.println("getView調用：" + position + ";" + convertView);
//			tv.setText(p.toString());
//			tv.setTextSize(18);
			
			View v = null;
			//判斷條目是否有緩存
			if(convertView == null){
				//把佈局文件填充成一個View對象
				v = View.inflate(MainActivity.this, R.layout.item_listview, null);
			}
			else{
				v = convertView;
			}
			
			
			//獲取佈局填充器對象
//			LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
//			使用佈局填充器填充佈局文件
//			View v2 = inflater.inflate(R.layout.item_listview, null);
			
//			LayoutInflater inflater2 = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
//			View v3 = inflater2.inflate(R.layout.item_listview, null);
			
			//通過資源id查找組件,注意調用的是View對象的findViewById
			TextView tv_name = (TextView) v.findViewById(R.id.tv_name);
			tv_name.setText(p.getName());
			TextView tv_phone = (TextView) v.findViewById(R.id.tv_phone);
			tv_phone.setText(p.getPhone());
			TextView tv_salary = (TextView) v.findViewById(R.id.tv_salary);
			tv_salary.setText(p.getSalary());
			return v;
		}
		
		@Override
		public Object getItem(int position) {
			return null;
		}

		@Override
		public long getItemId(int position) {
			return 0;
		}
    	
    }


    
}