listView 简括二(读取数据库里面的内容)

main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
  <LinearLayout 
      android:orientation="horizontal"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      >
        <TextView 
          android:layout_width="70dp"
          android:layout_height="wrap_content"
          android:text="编号"
          android:textSize="20sp"
          android:gravity="center"
          android:textStyle="bold"
          />     
      <TextView 
          android:layout_width="190dp"
          android:layout_height="wrap_content"
          android:text="姓名"
          android:textSize="20sp"
          android:textStyle="bold"
          />
       <TextView 
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="性别"
          android:textSize="20sp"
          android:textStyle="bold"
          />  
  </LinearLayout>
  <ListView //这里的数据用数据库里的数据填充
      android:id="@+id/lvPerson"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:scrollingCache="false" //如果设为true，当拖动listView，会出现黑色背景
      android:background="@drawable/bg"
      android:divider="@drawable/line"//线条
      
      ></ListView>

</LinearLayout>

Activity:

 public class ListView2Activity extends Activity {

     private ListView lvPerson;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        lvPerson=(ListView)findViewById(R.id.lvPerson);
        PersonDAO pDao=new PersonDAO(this);
        Cursor cursor=pDao.getPersons(); //得到PersonDAO对象中的返回的cursor集合
        SimpleCursorAdapter adapter=new SimpleCursorAdapter(this,R.layout.person_item,cursor,new String[]{"_id","pname","pgender"},new int[]{R.id.tvPid,R.id.tvPname,R.id.ivPgender});
        //SimpleCursorAdapter 有三个字段 context,layout布局文件，要显示的表列名，把要显示的列名数据填充到指定控件中
        lvPerson.setAdapter(adapter);
    }
}

注意这里并没有继承listActivity

person_item.xml 

填充数据的布局文件（填充到listview控件中）

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
	<TextView  
	 	android:id="@+id/tvPid"
	    android:layout_width="70dp" 
	    android:layout_height="50dp" 
	    android:gravity="center"
	    android:textSize="15sp"
	    />
	<TextView
		android:id="@+id/tvPname"
		android:layout_width="190dp"
		android:layout_height="50dp"
		android:gravity="center"
		android:textSize="15sp"
		/>
	<TextView
		android:id="@+id/ivPgender"
		android:layout_width="wrap_content"
		android:layout_height="50dp"
		android:gravity="center"
		android:textSize="15sp"
		/>
</LinearLayout>

 

DBOPenHelper

public class DBOPenHelper extends SQLiteOpenHelper {
	private static final int VERSION = 1;
	private static final String DBNAME = "data.db";
	private static final String PERSON="t_person";
	public DBOPenHelper(Context context) {
		super(context, DBNAME, null, VERSION);
		// TODO Auto-generated constructor stub
	}
	@Override
	public void onCreate(SQLiteDatabase db) {
		//如果用listView必须用一个_id的字段
		db.execSQL("create table "+PERSON+" (_id varchar(4) primary key,pname varchar(20),pgender varchar(2))");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1001','张三','男')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1002','李四','男')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1003','王五','女')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1004','赵钱','男')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1005','孙李','女')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1006','周吴','男')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1007','郑王','男')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1008','冯陈','男')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1009','褚卫','女')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1010','蒋沈','男')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1011','韩杨','男')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1012','朱秦','男')");
		db.execSQL("insert into t_person (_id, pname, pgender) values ('1013','尤许','男')");
	}
	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		// TODO Auto-generated method stub
	}
}

 PersonDAO

public class PersonDAO {
	private DBOPenHelper helper;
	private SQLiteDatabase db;
	public PersonDAO(Context context)
	{
		helper = new DBOPenHelper(context);
	}
	//分页
	public Cursor getPersons(int start, int count)
	{
		db = helper.getWritableDatabase();
		Cursor cursor=db.query("t_person", new String[]{"_id","pname","pgender"}, null, null, null, null, "_id desc",start+","+count);
		//db.query("表名", 表字段, null, 条件（_id=1）, 条件对象(new String[] {pname}), gruop by 分组字段, "order by的字段（_id desc）",分页索引,分页的总数据);
		return cursor;
	}
	public Cursor getPersons()
	{
		db = helper.getWritableDatabase();
		Cursor cursor=db.query("t_person", new String[]{"_id,pname,pgender"}, null, null, null, null, null);
		return cursor;
	}
	public long getCount()
	{
		db = helper.getWritableDatabase();
		Cursor cursor = db.rawQuery("select count(_id) from t_person", null);
		if (cursor.moveToNext())
		{
			return cursor.getLong(0);
		}
		return 0;
	}
}