09_android入门_listView的几种Adaptor的实现_simplecursoradaptor

public Cursor findCursor() {
SQLiteDatabase db=databaseHelper.getWritableDatabase();
//面试题：总是出现_id的错误--》添加as _id
Cursor c=db.rawQuery("select userid as _id,username,userage,usersalary,userphone from user",null);
//db.close();//报错
return c;
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 设置显示的视图
setContentView(R.layout.activity_main);

//获取显示的数据 Model
DatabaseHelper databaseHelper=new DatabaseHelper(this);
userDao=new UserDaoImpl(databaseHelper);
//查询获取的数据
c=userDao.findCursor();
//entities=userDao.findAll();
//获取控件对象
lv_user=(ListView) findViewById(R.id.lv_user);//获取显示的视图

//SimpleCursorAdapter adapter=new SimpleCursorAdapter(this, android.R.layout.simple_list_item_2, c, new String[]{"username","userphone"}, new int[]{android.R.id.text1,android.R.id.text2},CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
SimpleCursorAdapter adapter=new SimpleCursorAdapter(this, R.layout.list_item_user, c, new String[]{"_id","username","userage","userphone"}, new int[]{R.id.tv_id,R.id.tv_name,R.id.tv_age,R.id.tv_phone},CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);

lv_user.setAdapter(adapter);
}