Как справиться с добавлением или удалением избранного в этом случае - PullRequest
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Как справиться с добавлением или удалением избранного в этом случае

0 голосов
/ 29 мая 2020

В моем приложении есть возможность добавить / удалить избранное. Но это становится фаворитом с arraylist. Даже если я удалю элементы из списка, когда закрою и снова открою приложение, элемент вернется. Каждая категория имеет свою таблицу в моей структуре базы данных. Итак, если пользователь в категории, он может добавить или удалить избранное. Но на странице избранного я не могу удалить избранное. Можете ли вы, ребята, взглянуть на коды и подсказать мне, как решить, пожалуйста? получить любимые предметы 

case 20:
                favList.addAll(db.getFavFacts(Fact.TABLE_GENERAL_NAME, Fact.GENERAL_FACT_ID, Fact.GENERAL_FACT_NAME, Fact.GENERAL_FACT_FAV));
                favList.addAll(db.getFavFacts(Fact.TABLE_ANIMAL_NAME, Fact.ANIMAL_FACT_ID, Fact.ANIMAL_FACT_NAME,Fact.ANIMAL_FACT_FAV));
...

if(favList.isEmpty()){
                    factTextView.setText("You have no favorite facts yet!");
                    textViewId.setText(null);
                } else if(favList.size() == 1){
                    factTextView.setText(favList.get(readFromShared("FavoriteKey")-2).getFact());
                    textViewId.setText("Fact "+ (readFromShared("FavoriteKey")-1)+ " of " + favList.size());
                }
                else {
                    factTextView.setText(favList.get(readFromShared("FavoriteKey")-1).getFact());
                    textViewId.setText("Fact "+ (readFromShared("FavoriteKey"))+ " of " + favList.size());

                    relativeLayout.setOnTouchListener(new View.OnTouchListener() {
                        @Override
                        public boolean onTouch(View v, MotionEvent event) {
                            onSwipeFavMethod(event,favList,"FavoriteKey");
                            return true;
                        }});
                    break;
                }


        }

мой факт. java

package com.example.didyouknow;

public class Fact {
    //GENERAL
    public static String TABLE_GENERAL_NAME = "general_fact_table";
    public static String GENERAL_FACT_NAME = "general_fact_name";
    public static String GENERAL_FACT_ID = "general_fact_id";
    public static String GENERAL_FACT_FAV = "general_fact_fav";

    public static final String CREATE_GENERAL_TABLE =
            "CREATE TABLE " + TABLE_GENERAL_NAME + "("
                    + GENERAL_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + GENERAL_FACT_NAME + " TEXT,"
                    + GENERAL_FACT_FAV + " BOOLEAN"
                    + ")";
    //ANIMAL
    public static String TABLE_ANIMAL_NAME = "animal_fact_table";
    public static String ANIMAL_FACT_NAME = "animal_fact_name";
    public static String ANIMAL_FACT_ID = "animal_fact_id";
    public static String ANIMAL_FACT_FAV = "animal_fact_fav";

    public static final String CREATE_ANIMAL_TABLE =
            "CREATE TABLE " + TABLE_ANIMAL_NAME + "("
                    + ANIMAL_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + ANIMAL_FACT_NAME + " TEXT,"
                    + ANIMAL_FACT_FAV + " BOOLEAN"
                    + ")";

    //COMPUTER
    public static String TABLE_COMPUTER_NAME = "computer_fact_table";
    public static String COMPUTER_FACT_NAME = "computer_fact_name";
    public static String COMPUTER_FACT_ID = "computer_fact_id";
    public static String COMPUTER_FACT_FAV = "computer_fact_fav";

    public static final String CREATE_COMPUTER_TABLE =
            "CREATE TABLE " + TABLE_COMPUTER_NAME + "("
                    + COMPUTER_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + COMPUTER_FACT_NAME + " TEXT,"
                    + COMPUTER_FACT_FAV + " BOOLEAN"
                    + ")";

    //COUNTRIES
    public static String TABLE_COUNTRIES_NAME = "countries_fact_table";
    public static String COUNTRIES_FACT_NAME = "countries_fact_name";
    public static String COUNTRIES_FACT_ID = "countries_fact_id";
    public static String COUNTRIES_FACT_FAV = "countries_fact_fav";

    public static final String CREATE_COUNTRIES_TABLE =
            "CREATE TABLE " + TABLE_COUNTRIES_NAME + "("
                    + COUNTRIES_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + COUNTRIES_FACT_NAME + " TEXT,"
                    + COUNTRIES_FACT_FAV + " BOOLEAN"
                    + ")";

    //FOOD
    public static String TABLE_FOOD_NAME = "food_fact_table";
    public static String FOOD_FACT_NAME = "food_fact_name";
    public static String FOOD_FACT_ID = "food_fact_id";
    public static String FOOD_FACT_FAV = "food_fact_fav";

    public static final String CREATE_FOOD_TABLE =
            "CREATE TABLE " + TABLE_FOOD_NAME + "("
                    + FOOD_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + FOOD_FACT_NAME + " TEXT,"
                    + FOOD_FACT_FAV + " BOOLEAN"
                    + ")";

    //HUMANBODY
    public static String TABLE_HUMANBODY_NAME = "humanbody_fact_table";
    public static String HUMANBODY_FACT_NAME = "humanbody_fact_name";
    public static String HUMANBODY_FACT_ID = "humanbody_fact_id";
    public static String HUMANBODY_FACT_FAV = "humanbody_fact_fav";

    public static final String CREATE_HUMANBODY_TABLE =
            "CREATE TABLE " + TABLE_HUMANBODY_NAME + "("
                    + HUMANBODY_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + HUMANBODY_FACT_NAME + " TEXT,"
                    + HUMANBODY_FACT_FAV + " BOOLEAN"
                    + ")";

    //PEOPLE
    public static String TABLE_PEOPLE_NAME = "people_fact_table";
    public static String PEOPLE_FACT_NAME = "people_fact_name";
    public static String PEOPLE_FACT_ID = "people_fact_id";
    public static String PEOPLE_FACT_FAV = "people_fact_fav";

    public static final String CREATE_PEOPLE_TABLE =
            "CREATE TABLE " + TABLE_PEOPLE_NAME + "("
                    + PEOPLE_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + PEOPLE_FACT_NAME + " TEXT,"
                    + PEOPLE_FACT_FAV + " BOOLEAN"
                    + ")";

    //PSYCHOLOGY
    public static String TABLE_PSYCHOLOGY_NAME = "psychology_fact_table";
    public static String PSYCHOLOGY_FACT_NAME = "psychology_fact_name";
    public static String PSYCHOLOGY_FACT_ID = "psychology_fact_id";
    public static String PSYCHOLOGY_FACT_FAV = "psychology_fact_fav";

    public static final String CREATE_PSYCHOLOGY_TABLE =
            "CREATE TABLE " + TABLE_PSYCHOLOGY_NAME + "("
                    + PSYCHOLOGY_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + PSYCHOLOGY_FACT_NAME + " TEXT,"
                    + PSYCHOLOGY_FACT_FAV + " BOOLEAN"
                    + ")";

    //SCIENCE
    public static String TABLE_SCIENCE_NAME = "science_fact_table";
    public static String SCIENCE_FACT_NAME = "science_fact_name";
    public static String SCIENCE_FACT_ID = "science_fact_id";
    public static String SCIENCE_FACT_FAV = "science_fact_fav";

    public static final String CREATE_SCIENCE_TABLE =
            "CREATE TABLE " + TABLE_SCIENCE_NAME + "("
                    + SCIENCE_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + SCIENCE_FACT_NAME + " TEXT,"
                    + SCIENCE_FACT_FAV + " BOOLEAN"
                    + ")";

    //UNIVERSE
    public static String TABLE_UNIVERSE_NAME = "universe_fact_table";
    public static String UNIVERSE_FACT_NAME = "universe_fact_name";
    public static String UNIVERSE_FACT_ID = "universe_fact_id";
    public static String UNIVERSE_FACT_FAV = "universe_fact_fav";

    public static final String CREATE_UNIVERSE_TABLE =
            "CREATE TABLE " + TABLE_UNIVERSE_NAME + "("
                    + UNIVERSE_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + UNIVERSE_FACT_NAME + " TEXT,"
                    + UNIVERSE_FACT_FAV + " BOOLEAN"
                    + ")";

    //WEATHER
    public static String TABLE_WEATHER_NAME = "weather_fact_table";
    public static String WEATHER_FACT_NAME = "weather_fact_name";
    public static String WEATHER_FACT_ID = "weather_fact_id";
    public static String WEATHER_FACT_FAV = "weather_fact_fav";

    public static final String CREATE_WEATHER_TABLE =
            "CREATE TABLE " + TABLE_WEATHER_NAME + "("
                    + WEATHER_FACT_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + WEATHER_FACT_NAME + " TEXT,"
                    + WEATHER_FACT_FAV + " BOOLEAN"
                    + ")";


    private String fact;
    private int factId;
    private int favorite;

    public Fact(){

    }

    public Fact(int factId, String fact, int favorite) {
        this.fact = fact;
        this.factId = factId;
        this.favorite = favorite;
    }


    public String getFact() {
        return fact;
    }

    public void setFact(String fact) {
        this.fact = fact;
    }

    public int getFactId() {
        return factId;
    }

    public void setFactId(int factId) {
        this.factId = factId;
    }

    public int isFavorite() {
        return favorite;
    }

    public void setFavorite(int favorite) {
        this.favorite = favorite;
    }
}

моя база. java

package com.example.didyouknow;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;

public class DatabaseFacts extends SQLiteOpenHelper {

    private static final String dbName = "facts_db";
    private static final int dbVersion = 3;
    private Context context;


    public DatabaseFacts(Context context) {
        super(context, dbName, null, dbVersion);
        this.context = context;

        this.copyDbIfNotExists();
    }

    public void copyDbIfNotExists() {
        // Ensure /data/data/YOUR_PACKAGE_NAME/databases/ directory is created.
        File dbDir = new File(context.getDatabasePath(dbName).getParentFile().getPath());
        if (!dbDir.exists())
            dbDir.mkdir();

        // Copy database starts here.
        String appDbPath = this.context.getDatabasePath(dbName).getAbsolutePath();
        File dbFile = new File(appDbPath);
        if (!dbFile.exists()) {
            try {
                InputStream mInput = context.getAssets().open("facts_db");
                OutputStream mOutput = new FileOutputStream(appDbPath);
                byte[] mBuffer = new byte[1024];
                int mLength;
                while ((mLength = mInput.read(mBuffer, 0, 1024)) > 0)
                    mOutput.write(mBuffer, 0, mLength);
                mOutput.flush();

                mOutput.close();
                mInput.close();
            } catch (IOException ex) {
                throw new Error("Error copying database: " + ex.getMessage());
            }
        }
    }


    @Override
    public void onCreate(SQLiteDatabase db) {
//        db.execSQL(Fact.CREATE_GENERAL_TABLE);
//        db.execSQL(Fact.CREATE_ANIMAL_TABLE);
//        db.execSQL(Fact.CREATE_COMPUTER_TABLE);
//        db.execSQL(Fact.CREATE_COUNTRIES_TABLE);
.
.
.


    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
//        db.execSQL("DROP TABLE IF EXISTS " + Fact.TABLE_GENERAL_NAME);
//        db.execSQL("DROP TABLE IF EXISTS " + Fact.TABLE_ANIMAL_NAME);
//        db.execSQL("DROP TABLE IF EXISTS " + Fact.TABLE_COMPUTER_NAME);
....
//        onCreate(db);
    }

    public long insertFact(String fact, Boolean fav, String factFav, String factName, String tableName) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(factFav, fav);
        values.put(factName, fact);
        long id = db.insert(tableName, null, values);
        db.close();
        return id;
    }

    public Fact getFact(long id, String tableName, String factId, String factName, String factFav) {
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.query(tableName,
                new String[]{factId, factName, factFav},
                factId + "=?",
                new String[]{String.valueOf(id)}, null, null, null, null);
        if (cursor != null)
            cursor.moveToFirst();
        Fact fact = new Fact(
                cursor.getInt(cursor.getColumnIndex(factId)),
                cursor.getString(cursor.getColumnIndex(factName)),
                cursor.getInt(cursor.getColumnIndex(factFav)));
        cursor.close();
        return fact;
    }

    public ArrayList<Fact> getFavFacts(String tableName, String factId, String factName, String factFav) {
        ArrayList<Fact> facts = new ArrayList<>();
        String selectQuery = "SELECT  * FROM " + tableName + " WHERE " + factFav + "= 1";
        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);
        if (cursor.moveToFirst()) {
            do {
                Fact fact = new Fact();
                fact.setFactId(cursor.getInt(cursor.getColumnIndex(factId)));
                fact.setFact(cursor.getString(cursor.getColumnIndex(factName)));
                fact.setFavorite(Integer.valueOf(cursor.getString(cursor.getColumnIndex(factFav))));
                facts.add(fact);
            } while (cursor.moveToNext());
        }
        db.close();
        return facts;
    }



    public int getFactsCount(String tableName) {
        String countQuery = "SELECT  * FROM " + tableName;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        int count = cursor.getCount();
        cursor.close();
        return count;
    }


    public int updateFact(int factId, String factColumnId, Boolean fav, String factFav, String tableName, String factName, String name) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(factFav, fav);
        values.put(factName, name);
        // updating row
        return db.update(tableName, values, factColumnId + " = ?",
                new String[]{String.valueOf(factId)});
    }

//    public boolean isFavorite(int factId, String factColumnId, Boolean fav, String factFav, String tableName, String factName, String name){
//        SQLiteDatabase db = this.getReadableDatabase();
//        Cursor cursor = db.query(tableName, )
//    }

}
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