Android 从 SQLite 数据库填充自定义 ListView
Posted
技术标签:
【中文标题】Android 从 SQLite 数据库填充自定义 ListView【英文标题】：Android populate custom ListView from SQLite database 【发布时间】：2015-06-03 02:11:30 【问题描述】：我知道如何使用自定义适配器管理列表视图。 我会从 SQLite 数据库中填充我的列表视图。 这是我的 CartHandler：
public class CartHandler extends SQLiteOpenHelper
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "cartManager";
// Contacts table name
private static final String TABLE_PRODUCTS = "products";
// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_NO = "number";
private static final String KEY_PIECES = "pieces";
private static final String KEY_PRICE = "price";
private static final String KEY_TOT_PRICE = "totprice";
public CartHandler(Context context)
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db)
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_PRODUCTS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_NO + " TEXT," + KEY_PIECES + " TEXT,"+ KEY_PRICE + " TEXT," + KEY_TOT_PRICE + " TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE);
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_PRODUCTS);
// Create tables again
onCreate(db);
// Adding new contact
void addProduct(CartRow product)
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, product.getName()); // Contact Name
values.put(KEY_NO, product.getNumber()); // Contact Phone
values.put(KEY_PIECES, product.getPieces());
values.put(KEY_PRICE, product.getPrice());
values.put(KEY_TOT_PRICE, product.getTotPrice());
// Inserting Row
db.insert(TABLE_PRODUCTS, null, values);
db.close(); // Closing database connection
// Getting single contact
CartRow getProduct(int id)
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_PRODUCTS, new String[] KEY_ID,
KEY_NAME, KEY_NO, KEY_PIECES, KEY_PRICE, KEY_TOT_PRICE , KEY_ID + "=?",
new String[] String.valueOf(id) , null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
CartRow product = new CartRow(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), Integer.parseInt(cursor.getString(2)), Integer.parseInt(cursor.getString(3)), Integer.parseInt(cursor.getString(4)), Integer.parseInt(cursor.getString(5)));
// return contact
return product;
// Getting All Contacts
public List<CartRow> getAllProducts()
List<CartRow> productList = new ArrayList<CartRow>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_PRODUCTS;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst())
do
CartRow product = new CartRow();
product.setID(Integer.parseInt(cursor.getString(0)));
product.setName(cursor.getString(1));
product.setNumber(Integer.parseInt(cursor.getString(2)));
product.setPieces(Integer.parseInt(cursor.getString(3)));
product.setPrice(Integer.parseInt(cursor.getString(4)));
product.setTotPrice(Integer.parseInt(cursor.getString(5)));
// Adding contact to list
productList.add(product);
while (cursor.moveToNext());
// return contact list
return productList;
// Updating single contact
public int updateProduct(CartRow product)
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, product.getName());
values.put(KEY_NO, product.getNumber());
values.put(KEY_PIECES, product.getPieces());
values.put(KEY_PRICE, product.getPrice());
values.put(KEY_TOT_PRICE, product.getTotPrice());
// updating row
return db.update(TABLE_PRODUCTS, values, KEY_ID + " = ?",
new String[] String.valueOf(product.getID()) );
// Deleting single contact
public void deleteProduct(CartRow product)
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_PRODUCTS, KEY_ID + " = ?",
new String[] String.valueOf(product.getID()) );
db.close();
// Getting contacts Count
public int getProductsCount()
String countQuery = "SELECT * FROM " + TABLE_PRODUCTS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
这是我的 CartRow 课程：
public class CartRow
//private variables
int _id;
String _name;
int _number;
int _pieces;
int _price;
int _totprice;
// Empty constructor
public CartRow()
// constructor
public CartRow(int id, String name, int number, int pieces, int price, int totprice)
this._id = id;
this._name = name;
this._number = number;
this._pieces = pieces;
this._price = price;
this._totprice = totprice;
// constructor
public CartRow(String name, int number, int pieces, int price, int totprice)
this._name = name;
this._number = number;
this._pieces = pieces;
this._price = price;
this._totprice = totprice;
// getting ID
public int getID()
return this._id;
// setting id
public void setID(int id)
this._id = id;
public String getName()
return this._name;
public void setName(String name)
this._name = name;
public int getNumber()
return this._number;
public void setNumber(int number)
this._number = number;
public int getPieces()
return this._pieces;
public void setPieces(int pieces)
this._pieces = pieces;
public int getPrice()
return this._price;
public void setPrice(int price)
this._price = price;
public int getTotPrice()
return this._totprice;
public void setTotPrice(int totprice)
this._totprice = totprice;
这是我想在列表视图中使用的布局。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_
android:layout_
android:paddingLeft="20dp"
android:paddingTop="10dp"
android:paddingRight="10dp"
android:background="@android:color/white"
android:paddingBottom="10dp">
<TextView
android:layout_
android:layout_
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="@+id/number"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textColor="@android:color/black" />
<TextView
android:layout_
android:layout_
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="@+id/name"
android:layout_alignBottom="@+id/number"
android:layout_toRightOf="@+id/number"
android:layout_toEndOf="@+id/number"
android:layout_marginLeft="25dp"
android:layout_marginStart="29dp"
android:textColor="@android:color/black" />
<TextView
android:layout_
android:layout_
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/pieces"
android:layout_below="@+id/name"
android:layout_alignLeft="@+id/name"
android:layout_alignStart="@+id/name"
android:layout_marginLeft="1dp"
android:layout_marginTop="5dp" />
<TextView
android:layout_
android:layout_
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/price"
android:layout_below="@+id/pieces"
android:layout_alignLeft="@+id/pieces"
android:layout_alignStart="@+id/pieces" />
<TextView
android:layout_
android:layout_
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="@+id/totprice"
android:layout_alignTop="@+id/name"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:textColor="#ffe20c18" />
</RelativeLayout>
我正确地填充了数据库并读取了 LogCat 中的内容。 不知道如何填充我的列表视图。试图查看类似的问题，但发现了如何填充单个信息。 我应该已经拥有让它工作所需的大部分代码，我不会更改整个代码来遵循示例教程。 谁能帮我？ 任何建议将不胜感激。提前致谢。
【问题讨论】：
显示您的列表视图适配器代码 是的，显示您的自定义 listView 适配器。那么只有我们可以帮助你:) 我不知道在这种情况下如何设置我的适配器，这是我的问题。 Varun Madhvani 的回答应该有效，但我错过了中间的重点。 【参考方案1】：首先在您的 Cart Class 类中创建列名列表，
public static ArrayList<String> itemIdList = new ArrayList<String>();
public static ArrayList<String> itemNameList = new ArrayList<String>();
public static ArrayList<String> itemQuantityList = new ArrayList<String>();
public static ArrayList<String> itemPriceList = new ArrayList<String>();
调用这个类从数据库中获取项目并添加到列表中。
public void getItemsFromDatabase()
Cursor cursor = null;
try
mdb=new DBCart(getApplicationContext(), DATABASE_NAME,null, DATABASE_VERSION);
db=mdb.getReadableDatabase();
cursor=db.rawQuery("select * from cart", null);
cursor.moveToFirst();
while (cursor.moveToNext())
Log.e("get", cursor.getString(1)+":"+cursor.getString(2)+":"+cursor.getString(3)+":"+cursor.getString(4));
//Here i added data directly to lists in Custom Cart Class
CartClass.itemIdList.add(cursor.getString(1));
CartClass.itemNameList.add(cursor.getString(2));
CartClass.itemQuantityList.add(cursor.getString(3));
CartClass.itemPriceList.add(cursor.getString(4));
cursor.close();
catch (SQLException e)
Log.e("DB Error", e.toString());
e.printStackTrace();
首先使用此代码创建自定义购物车列表
class CustomCartList extends BaseAdapter
private LayoutInflater inflater;
private SparseBooleanArray mSelectedItemsIds;
public CustomCartList(Context context)
inflater = LayoutInflater.from(context);
mSelectedItemsIds = new SparseBooleanArray();
public int getCount()
// TODO Auto-generated method stub
return Cart.itemIdList.size();
public Object getItem(int position)
// TODO Auto-generated method stub
return position;
public long getItemId(int position)
// TODO Auto-generated method stub
return position;
@SuppressLint("InflateParams")
public View getView(int position, View convertView, ViewGroup parent)
// TODO Auto-generated method stub
ViewHolder holder;
if(convertView == null)
convertView = inflater.inflate(R.layout.cart_layout_row, null);
holder = new ViewHolder();
holder.itemName = (TextView) convertView.findViewById(R.id.itemName);
holder.itemQuantity = (TextView) convertView.findViewById(R.id.itemQuantity);
holder.itemPrice = (TextView) convertView.findViewById(R.id.itemPrice);
convertView.setTag(holder);
else
holder = (ViewHolder) convertView.getTag();
holder.itemName.setText(Cart.itemNameList.get(position));
holder.itemQuantity.setText(Cart.itemQuantityList.get(position));
holder.itemPrice.setText(Cart.itemPriceList.get(position));
return convertView;
static class ViewHolder
TextView itemName, itemQuantity, itemPrice;
public void toggleSelection(int position)
selectView(position, !mSelectedItemsIds.get(position));
public void selectView(int position, boolean value)
if (value)
mSelectedItemsIds.put(position, value);
else
mSelectedItemsIds.delete(position);
notifyDataSetChanged();
public int getSelectedCount()
return mSelectedItemsIds.size();
public SparseBooleanArray getSelectedIds()
return mSelectedItemsIds;
public void removeSelection()
mSelectedItemsIds = new SparseBooleanArray();
notifyDataSetChanged();
使用
创建 CustomCartList 类的适配器CustomCartList adapter=new CustomCartList(YourActivity.this);
比设置列表适配器使用
list.setAdapter(adapter);
【讨论】：
它应该可以工作，但我错过了适配器，不知道如何设置它并链接到 sqlite 查询结果 效果很好！感谢您的时间。只需要设置一些小细节，你为我解决了一个大问题。 为了避免另一个问题：如果我删除这个列表会怎样？db.deleteAll() 有效，但删除了我的数据库，而不是这个列表，每次我添加一个产品时它都会进入旧列表。以上是关于Android 从 SQLite 数据库填充自定义 ListView的主要内容，如果未能解决你的问题，请参考以下文章
Android Sqlite：如何从 Listview 中获取 SQLite rowId？
SQLite SELECT查询中的自定义字段填充后不会成为DataTable中的DateTime列？
设置模型类和自定义适配器以从 onListItemClick 获取 SQLite DB rowID