使用listview绑定sqlite中的数据

我想在我的安卓项目中实现一个这样的功能，读取sqlite数据库中的数据并显示到某个页面的listview控件中。

首先，我建立了一个Service类，来实现对数据库的各种操作，然后在这个类中添加对数据库操作的增删改查方法。具体代码如下：

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import android.content.ContentValues;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import com.example.cardemo1.Username;

import com.example.cardemo1.db.DBHelper;

public class CarService {

    private DBHelper dbHelper;

    public CarService(Context context){

        dbHelper=new DBHelper(context);

    }

    //添加车辆信息

    public boolean register(Car car,String num){

        SQLiteDatabase sdb = dbHelper.getReadableDatabase();

        String str = "select carnumber from car where carnumber = ?";

        Cursor cursor = sdb.rawQuery(str, new String[]{num});

        if(cursor.moveToFirst() != true){

        String sql ="insert into car(_id,carbrand,carsign,carmodel,carnumber,enginenum,bodylevel,mileage,gasoline,engineperfor,transperfor,carlight) values(?,?,?,?,?,?,?,?,?,?,?,?)";

        Object obj[]={car.get_id(),car.getCarbrand(),car.getCarsign(),car.getCarmodel(),car.getCarnumber(),car.getEnginenum(),

                car.getBodylevel(),car.getMileage(),car.getGasoline(),car.getEngineperfor(),car.getTransperfor(),car.getCarlight()};

        sdb.execSQL(sql,obj);

        return true;

        }else{

        return false;

        }

    }

    //查询车辆信息,返回类型是ArrayList

    public ArrayList select(String _id){

        ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();

        SQLiteDatabase sdb = dbHelper.getReadableDatabase();

        String sql="select * from car where _id=?";

        Cursor cursor = sdb.rawQuery(sql, new String[]{_id});

        while(cursor.moveToNext()){

            HashMap<String, String> map= new HashMap<String, String>();

            map.put("carbrand",cursor.getString(1));

            map.put("carsign",cursor.getString(2));

            map.put("carmodel",cursor.getString(3));

            map.put("carnumber",cursor.getString(4));

            map.put("enginenum",cursor.getString(5));

            map.put("bodylevel",cursor.getString(6));

            map.put("mileage",cursor.getString(7));

            map.put("gasoline",cursor.getString(8));

            map.put("engineperfor", cursor.getString(9));

            map.put("transperfor", cursor.getString(10));

            map.put("carlight", cursor.getString(11));

            list.add(map);

        }

        return list;

    }

   

    //查询车牌号，返回类型是数组

    public String[] select_carnum(String _id){

        String[] carnum = new String[20];

        String carnumber;

        int index;

        SQLiteDatabase sdb = dbHelper.getReadableDatabase();

        String sql="select carnumber from car where _id=?";

        Cursor cursor = sdb.rawQuery(sql, new String[]{_id});

        int i = 0;

        while(cursor.moveToNext()){

            index = cursor.getColumnIndex("carnumber");

            carnum[i] = cursor.getString(index);

            i++;

        }

        return carnum;

    }

    //更新车辆信息

    public boolean update(Car car,String num){

        SQLiteDatabase sdb = dbHelper.getReadableDatabase();

        String str ="select carnumber from car where carnumber = ?";

        Cursor cursor = sdb.rawQuery(str, new String[]{num});

        if(cursor.moveToFirst() == true){

        String sql="update car set carbrand=?,carsign=?,carmodel=?,enginenum=?,bodylevel=?,mileage=?,gasoline=?,engineperfor=?,transperfor=?,carlight=? where _id = ?" ;

        Object obj[]={car.getCarbrand(),car.getCarsign(),car.getCarmodel(),car.getEnginenum(),

                car.getBodylevel(),car.getMileage(),car.getGasoline(),car.getEngineperfor(),car.getTransperfor(),car.getCarlight(),car.get_id()};

        sdb.execSQL(sql,obj);

        return true;

        }else

        {

        String sql="update car set carbrand=?,carsign=?,carmodel=?,carnumber=?,enginenum=?,bodylevel=?,mileage=?,gasoline=?,engineperfor=?,transperfor=?,carlight=? where _id = ?" ;

        Object obj[]={car.getCarbrand(),car.getCarsign(),car.getCarmodel(),car.getCarnumber(),car.getEnginenum(),

        car.getBodylevel(),car.getMileage(),car.getGasoline(),car.getEngineperfor(),car.getTransperfor(),car.getCarlight(),car.get_id()};

        sdb.execSQL(sql,obj);

        return true;

        }

}

其中加粗的是我要提取并和listview绑定的数据。然后我在activity类中是这么写的：

Username uname = (Username) getApplicationContext();

        String name =  uname.getUsername();

        CarService service = new CarService(CarSeeActivity.this);

//调用Service中的select方法 来获取数据库中的数据      

service.select(name);

//实例化listview空间

        ListView lv = (ListView) findViewById(R.id.lv);

//创建adapter

        SimpleAdapter adapter = new SimpleAdapter(CarSeeActivity.this, service.select(name), R.layout.item, new String[]{"carbrand","carsign","carmodel","carnumber","enginenum","bodylevel","mileage","gasoline","engineperfor","transperfor","carlight"},

                new int[]{R.id.car_carbrand,R.id.car_carsign,R.id.car_carmodel,R.id.car_carnumber,R.id.car_enginenum,R.id.car_bodylevel,R.id.car_mileage,R.id.car_gasoline,R.id.car_engineperfor,R.id.car_transperfor,R.id.car_light});

        //将listview和adapter绑定

        lv.setAdapter(adapter);

//设置点击事件

        lv.setOnItemClickListener(new ItemClickListener());

 

前两句是获取用户名的，为了在数据库中进行查找，获取用户名就可以。

public class ItemClickListener implements OnItemClickListener{

        @Override

        public void onItemClick(AdapterView<?> parent, View view, int position,

                long id) {

            // TODO Auto-generated method stub

            ListView listview = (ListView)parent;

            HashMap<String, String> data = (HashMap<String, String>)listview.getItemAtPosition(position);  

            String carid = data.get("carnumber");  

            Toast.makeText(getApplicationContext(), "车牌号为"+carid+"的车辆信息", 1).show();  

            

        }