我想在我的Android应用程序中添加一个添加到收藏夹选项

我正在制作简单的壁纸应用程序.我想添加到最喜欢的选项来实现.我正在使用sqlite存储图像链接,然后通过毕加索将其丢失.帮助我如何添加喜欢的按钮工作.谢谢!

您需要在表中添加新列

例如isFavourite

并存储布尔 值,如0 -unfavorite和1 - 收藏

然后,您需要触发查询如何从数据库中获取数据

如需更多帮助,请参阅此链接

示例: 我们有这个表 - DataTable

1)编写SQLite数据库处理程序类

public class DatabaseHandler extends SQLiteOpenHelper {

// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;

// Database Name
private static final String DATABASE_NAME = "dataManager";

//  table name
private static final String TABLE_DATA = "data";

//  Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_IMG_URL = "ImgFavourite";
private static final String KEY_IS_FAVOURITE= "IsFavourite";

public DatabaseHandler(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
    String CREATE_TABLE = "CREATE TABLE " + TABLE_DATA + "("
            + KEY_ID + " INTEGER PRIMARY KEY," + KEY_IMG_URL+ " TEXT,"
            + KEY_IS_FAVOURITE+ " INTEGER" + ")";
    db.execSQL(CREATE_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_DATA );

    // Create tables again
    onCreate(db);
}

插入新记录

// Adding new data
public void addData(Data data) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_IMG_URL, data.getImgUrl());
    values.put(KEY_IS_FAVOURITE, data.getIsFavoutire());

    // Inserting Row
    db.insert(TABLE_DATA, null, values);
    db.close(); // Closing database connection

更新记录

// Updating single data
public int updateData(Data data) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_IMG_URL, data.getImgUrl());
    values.put(KEY_IS_FAVOURITE, data.getIsFavoutire());

    // updating row
    return db.update(TABLE_DATA, values, KEY_ID + " = ?",
            new String[] { String.valueOf(data.getID()) });
}

注意:SQLite没有单独的布尔存储类.相反,布尔值存储为整数0(假)和1(真).

如需更多帮助,请参阅此链接