Question

CODE：

private static final String CREATE_DETAILEDMEALS = "CREATE TABLE "
        + TABLE_DetailedMeals + "(" + KEY_ID + " INTEGER PRIMARY KEY,"
        + mealsName + " TEXT unique," + categoryId + " INTEGER,"
        + desc + " TEXT," + size + " TEXT,"
        + price + " TEXT" + ")";

public void addDetailedMeals(String name, int catId, String d, String s, String p){
                ContentValues values = new ContentValues(1);
                values.put(mealsName, name);
                values.put(categoryId, catId);
                values.put(desc, d);
                values.put(size, s);
                values.put(price, p);
                getWritableDatabase().insert(TABLE_DetailedMeals, null, values);
            }

            public Cursor getMeals2(int id)
            {
                Cursor cursor = getReadableDatabase().rawQuery("SELECT Name, Description, Size, Price FROM " + TABLE_DetailedMeals + " WHERE " + categoryId + "=" + String.valueOf(id), null);
                return cursor;
            }

            // ID1 = MEALS
            public ArrayList<DetailedMeals> GetDetailedMeals(int ID1)
            {
                ArrayList<DetailedMeals> list = new ArrayList<DetailedMeals>();
                Cursor cursor =  getMeals2(ID1);
                int i = 0; // Iterator for 'do-while'. While it gets Categories names, it shall catch all the url's from array as well.
                if (cursor.moveToFirst())
                {
                    do
                    {
                        DetailedMeals cat = new DetailedMeals();
                        cat.setName(cursor.getString(cursor.getColumnIndex(mealsName))); //mealsName
                        cat.setDescription(cursor.getString(cursor.getColumnIndex(mealsName)));
                        cat.setSize(cursor.getString(cursor.getColumnIndex(mealsName)));
                        cat.setPrice(cursor.getString(cursor.getColumnIndex(mealsName)));

                        switch (ID1) {
                            case 1:  cat.setImage(PIZZA_image_urls[i]);
                                break;
                            case 2:  cat.setImage(BEER_image_urls[i]);
                                break;
                            default:
                                break;
                        }
                        list.add(cat);
                        i++;
                    }
                    while (cursor.moveToNext());
                }
                if (cursor != null && !cursor.isClosed())
                {
                    cursor.close();
                }
                return list;
            }

适配器：

public class DifferentRowAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

FragmentActivity c;
ArrayList<DetailedMeals> MealsList;


private final int MEAL = 0, DETAIL = 1;

public DifferentRowAdapter(FragmentActivity c, ArrayList<DetailedMeals> MealsList) {
    this.c = c;
    this.MealsList = MealsList;
}


@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view;
    switch (viewType) {
        case MEAL:
            view = LayoutInflater.from(parent.getContext()).inflate(R.layout.rec_item, parent, false);
            return new mViewHolder(view);
        case DETAIL:
            view = LayoutInflater.from(parent.getContext()).inflate(R.layout.details_item, parent, false);
            return new dViewHolder(view);
    }
    return null;
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
    DetailedMeals object = MealsList.get(position);
    if (object != null) {
        switch (object.getmType()) {
            case MEAL:
                ((mViewHolder) holder).mNameTextView.setText(object.getName());
                Glide.with(c)
                        .load(MealsList.get(position).getImage())
                        .diskCacheStrategy(DiskCacheStrategy.ALL) // Saves the media item after all transformations to cache and
                        // Saves just the original data to cache.
                        .placeholder(R.mipmap.ic_launcher)
                        .into(((mViewHolder) holder).img);
                break;
            case DETAIL:
                ((dViewHolder) holder).descTextView.setText(object.getDescription());
                ((dViewHolder) holder).sizeTextView.setText(object.getSize());
                ((dViewHolder) holder).priceTextView.setText(object.getPrice());
                break;
        }
    }
}

@Override
public int getItemCount() {
    if (MealsList == null)
        return 0;
    return MealsList.size();
}

@Override
public int getItemViewType(int position) {
    if (MealsList != null) {
        DetailedMeals object = MealsList.get(position);
        if (object != null) {
            return object.getmType();
        }
    }
    return 0;
}

public class dViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    TextView descTextView;
    TextView sizeTextView;
    TextView priceTextView;

    detailsItemClickListener icl;

    public dViewHolder(View itemView) {
        super(itemView);

        // Get references to desc, size, price
        descTextView = (TextView) itemView.findViewById(R.id.desc);
        sizeTextView = (TextView) itemView.findViewById(R.id.size);
        priceTextView = (TextView) itemView.findViewById(R.id.price);

        itemView.setOnClickListener(this);
    }

    public void setItemClickListener(detailsItemClickListener icl)
    {
        this.icl = icl;
    }

    @Override
    public void onClick(View v){
        this.icl.onItemClick(v, getPosition());
    }

}

public class mViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

    TextView mNameTextView;
    ImageView img;
    mealsItemClickListener icl;



    public mViewHolder(View itemView) {
        super(itemView);

        // Get references to image and name.
        mNameTextView = (TextView) itemView.findViewById(R.id.name);
        img = (ImageView) itemView.findViewById(R.id.category_image);

        itemView.setOnClickListener(this);
    }

    public void setItemClickListener(mealsItemClickListener icl)
    {
        this.icl = icl;
    }

    @Override
    public void onClick(View v){
        this.icl.onItemClick(v, getPosition());
    }

}
}

DetailedMeals.class

public class DetailedMeals {

private String name;
private String image;
private String description;
private String size;
private String price;
private int id;
private int mType;


public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getImage() {
    return image;
}

public void setImage(String image) {
    this.image = image;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public String getSize() {
    return size;
}

public void setSize(String size) {
    this.size = size;
}

public String getPrice() {
    return price;
}

public void setPrice(String price) {
    this.price = price;
}

public int getmType() {
    return mType;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}
}

现在，GetDetailedMeals（..）仅返回详细信息名称（不是名称/ desc /价格/大小）等。而且，在我只使用Meal名称获得recyclelerview之前，它会尝试返回它。

我的目标是：https://img.exs.lv/l/a/lat-deels/fragm_1.png

Answer 1

将您的DifferentRowAdapter扩展为RecyclerView.Adapter，因为您使用的视图在DifferentRowAdapter中。

Answer 2

您在代码中

list.add(cat);将 DetailedMeals 放入 DiffRowAdapter 列表中

所以改变

public ArrayList<DifferentRowAdapter> GetDetailedMeals(int ID1)

到

public ArrayList<DetailedMeals> GetDetailedMeals(int ID1)

拥有相同的列表和适配器。然后把结果听到知道会发生什么。

<强>更新

更改后，您只需在视图中显示名称，因此在mViewHolder中添加更多项目，如price或desc：

public mViewHolder(View itemView) {
    super(itemView);

    // Get references to image and name.
    mNameTextView = (TextView) itemView.findViewById(R.id.name);
    // Add them hear
    mPriceTextView = (TextView) itemView.findViewById(R.id.price);
    mDescTextView = (TextView) itemView.findViewById(R.id.desc);        
    img = (ImageView) itemView.findViewById(R.id.category_image);

    itemView.setOnClickListener(this);
}

从数据库[SQLite]

2 个答案: